

8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA +
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless,
low voltage (2.7V–5.5V), low power, high speed (33 MHz)
Product specification
Supersedes data of 1998 Jun 04
IC20 Data Handbook
1999 Apr 01
INTEGRATED CIRCUITS
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33 MHz)
2
1999 Apr 01 853-2068 21142
DESCRIPTION
Three different Single-Chip 8-Bit Microcontroller families are
presented in this datasheet:
•80C32/8XC52/8XC54/8XC58
•80C51FA/8XC51FA/8XC51FB/8XC51FC
•80C51RA+/8XC51RA+/8XC51RB+/8XC51RC+/8XC51RD+
For applications requiring 4K ROM/EPROM, see the 8XC51/80C31
8-bit CMOS (low voltage, low power, and high speed)
microcontroller families datasheet.
All the families are Single-Chip 8-Bit Microcontrollers manufactured
in advanced CMOS process and are derivatives of the 80C51
microcontroller family. All the devices have the same instruction set
as the 80C51.
These devices provide architectural enhancements that make them
applicable in a variety of applications for general control systems.
ROM/EPROM
Memory Size
(X by 8)
RAM Size
(X by 8) Programmable
Timer Counter
(PCA)
Hardware
W atch Dog
Timer
80C31/8XC51
0K/4K 128 No No
80C32/8XC52/54/58
0K/8K/16K/32K 256 No No
80C51FA/8XC51FA/FB/FC
0K/8K/16K/32K 256 Yes No
80C51RA+/8XC51RA+/RB+/RC+
0K/8K/16K/32K 512 Yes Yes
8XC51RD+
64K 1024 Yes Yes
The ROMless devices, 80C32, 80C51FA, and 80C51RA+ can
address up to 64K of external memory. All the devices have four
8-bit I/O ports, three 16-bit timer/event counters, a multi-source,
four-priority-level, nested interrupt structure, an enhanced UART
and on-chip oscillator and timing circuits. For systems that require
extra memory capability up to 64k bytes, each can be expanded
using standard TTL-compatible memories and logic.
Its added features make it an even more powerful microcontroller for
applications that require pulse width modulation, high-speed I/O and
up/down counting capabilities such as motor control. It also has a
more versatile serial channel that facilitates multiprocessor
communications.
FEATURES
•80C51 Central Processing Unit
•Speed up to 33MHz
•Full static operation
•Operating voltage range: 2.7V to 5.5V @ 16MHz
•Security bits:
–ROM – 2 bits
–OTP–EPROM – 3 bits
•Encryption array – 64 bytes
•RAM expandable to 64K bytes
•4 level priority interrupt
•6 or7 interrupt sources, depending on device
•Four 8-bit I/O ports
•Full-duplex enhanced UART
–Framing error detection
–Automatic address recognition
•Power control modes
–Clock can be stopped and resumed
–Idle mode
–Power down mode
•Programmable clock out
•Second DPTR register
•Asynchronous port reset
•Low EMI (inhibit ALE)
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33 MHz)
1999 Apr 01 3
BLOCK DIAGRAM
PSEN
EAVPP
ALE/PROG
RST
XTAL1 XTAL2
VCC
VSS
PORT 0
DRIVERS PORT 2
DRIVERS
RAM ADDR
REGISTER RAM PORT 0
LATCH PORT 2
LATCH ROM/EPROM
REGISTER
BACC STACK
POINTER
TMP2 TMP1
ALU
TIMING
AND
CONTROL
INSTRUCTION
REGISTER
PD
OSCILLATOR
PSW
PORT 1
LATCH PORT 3
LATCH
PORT 1
DRIVERS PORT 3
DRIVERS
PROGRAM
ADDRESS
REGISTER
BUFFER
PC
INCRE-
MENTER
PROGRAM
COUNTER
DPTR’S
MULTIPLE
P1.0–P1.7 P3.0–P3.7
P0.0–P0.7 P2.0–P2.7
SFRs
TIMERS
P.C.A. (FA & RA+ only)
SU00831B
8
8 16
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33 MHz)
1999 Apr 01 4
LOGIC SYMBOL
PORT 0
PORT 1PORT 2
PORT 3
ADDRESS AND
DATA BUS
ADDRESS BUS
T2
T2EX
RxD
TxD
INT0
INT1
T0
T1
WR
RD
SECONDARY FUNCTIONS
RST
EA/VPP
PSEN
ALE/PROG
VSS
VCC
XTAL1
XTAL2
SU00830
PIN CONFIGURATIONS
DUAL IN-LINE PACKAGE PIN FUNCTIONS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20 21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
T2/P1.0
T2EX/P1.1
ECI/P1.2
CEX0/P1.3
CEX1/P1.4
CEX2/P1.5
CEX3/P1.6
RST
RxD/P3.0
TxD/P3.1
INT0/P3.2
INT1/P3.3
T0/P3.4
T1/P3.5
CEX4/P1.7
WR/P3.6
RD/P3.7
XTAL2
XTAL1
VSS P2.0/A8
P2.1/A9
P2.2/A10
P2.3/A11
P2.4/A12
P2.5/A13
P2.6/A14
P2.7/A15
PSEN
ALE/PROG
EA/VPP
P0.7/AD7
P0.6/AD6
P0.5/AD5
P0.4/AD4
P0.3/AD3
P0.2/AD2
P0.1/AD1
P0.0/AD0
VCC
DUAL
IN-LINE
PACKAGE
SU00021
PLASTIC LEADED CHIP CARRIER PIN FUNCTIONS
LCC
6140
7
17
39
29
18 28
Pin Function
1 NIC*
2 P1.0/T2
3 P1.1/T2EX
4 P1.2/ECI
5 P1.3/CEX0
6 P1.4/CEX1
7 P1.5/CEX2
8 P1.6/CEX3
9 P1.7/CEX4
10 RST
11 P3.0/RxD
12 NIC*
13 P3.1/TxD
14 P3.2/INT0
15 P3.3/INT1
Pin Function
16 P3.4/T0
17 P3.5/T1
18 P3.6/WR
19 P3.7/RD
20 XTAL2
21 XTAL1
22 VSS
23 NIC*
24 P2.0/A8
25 P2.1/A9
26 P2.2/A10
27 P2.3/A11
28 P2.4/A12
29 P2.5/A13
30 P2.6/A14
Pin Function
31 P2.7/A15
32 PSEN
33 ALE/PROG
34 NIC*
35 EA/VPP
36 P0.7/AD7
37 P0.6/AD6
38 P0.5/AD5
39 P0.4/AD4
40 P0.3/AD3
41 P0.2/AD2
42 P0.1/AD1
43 P0.0/AD0
44 VCC
SU00023
* NO INTERNAL CONNECTION
PLASTIC QUAD FLAT PACK
PIN FUNCTIONS
PQFP
44 34
1
11
33
23
12 22
Pin Function
1 P1.5/CEX2
2 P1.6/CEX3
3 P1.7/CEX4
4 RST
5 P3.0/RxD
6 NIC*
7 P3.1/TxD
8 P3.2/INT0
9 P3.3/INT1
10 P3.4/T0
11 P3.5/T1
12 P3.6/WR
13 P3.7/RD
14 XTAL2
15 XTAL1
Pin Function
16 VSS
17 NIC*
18 P2.0/A8
19 P2.1/A9
20 P2.2/A10
21 P2.3/A11
22 P2.4/A12
23 P2.5/A13
24 P2.6/A14
25 P2.7/A15
26 PSEN
27 ALE/PROG
28 NIC*
29 EA/VPP
30 P0.7/AD7
Pin Function
31 P0.6/AD6
32 P0.5/AD5
33 P0.4/AD4
34 P0.3/AD3
35 P0.2/AD2
36 P0.1/AD1
37 P0.0/AD0
38 VCC
39 NIC*
40 P1.0/T2
41 P1.1/T2EX
42 P1.2/ECI
43 P1.3/CEX0
44 P1.4/CEX1
SU00024
* NO INTERNAL CONNECTION
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33 MHz)
1999 Apr 01 5
PIN DESCRIPTIONS
PIN NUMBER
MNEMONIC DIP LCC QFP TYPE NAME AND FUNCTION
VSS 20 22 16 I Ground: 0V reference.
VCC 40 44 38 I Power Supply: This is the power supply voltage for normal, idle, and power-down operation.
P0.0–0.7 39–32 43–36 37–30 I/O Port 0: Port 0 is an open-drain, bidirectional I/O port. Port 0 pins that have 1s written to
them float and can be used as high-impedance inputs. Port 0 is also the multiplexed
low-order address and data bus during accesses to external program and data memory. In
this application, it uses strong internal pull-ups when emitting 1s. Port 0 also outputs the
code bytes during program verification and received code bytes during EPROM
programming. External pull-ups are required during program verification.
P1.0–P1.7 1–8 2–9 40–44,
1–3 I/O Port 1: Port 1 is an 8-bit bidirectional I/O port with internal pull-ups. Port 1 pins that have 1s
written to them are pulled high by the internal pull-ups and can be used as inputs. As inputs,
port 1 pins that are externally pulled low will source current because of the internal pull-ups.
(See DC Electrical Characteristics: IIL). Port 1 also receives the low-order address byte
during program memory verification.
Alternate functions for 8XC51FX and 8XC51RX+ Port 1 include:
1 2 40 I/O T2 (P1.0): T imer/Counter 2 external count input/Clockout (see Programmable Clock-Out)
2 3 41 I T2EX (P1.1): Timer/Counter 2 Reload/Capture/Direction Control
3 4 42 I ECI (P1.2): External Clock Input to the PCA
4 5 43 I/O CEX0 (P1.3): Capture/Compare External I/O for PCA module 0
5 6 44 I/O CEX1 (P1.4): Capture/Compare External I/O for PCA module 1
6 7 1 I/O CEX2 (P1.5): Capture/Compare External I/O for PCA module 2
7 8 2 I/O CEX3 (P1.6): Capture/Compare External I/O for PCA module 3
8 9 3 I/O CEX4 (P1.7): Capture/Compare External I/O for PCA module 4
P2.0–P2.7 21–28 24–31 18–25 I/O Port 2: Port 2 is an 8-bit bidirectional I/O port with internal pull-ups. Port 2 pins that have 1s
written to them are pulled high by the internal pull-ups and can be used as inputs. As inputs,
port 2 pins that are externally being pulled low will source current because of the internal
pull-ups. (See DC Electrical Characteristics: IIL). Port 2 emits the high-order address byte
during fetches from external program memory and during accesses to external data memory
that use 16-bit addresses (MOVX @DPTR). In this application, it uses strong internal
pull-ups when emitting 1s. During accesses to external data memory that use 8-bit addresses
(MOV @Ri), port 2 emits the contents of the P2 special function register. Some Port 2 pins
receive the high order address bits during EPROM programming and verification.
P3.0–P3.7 10–17 11,
13–19 5,
7–13 I/O Port 3: Port 3 is an 8-bit bidirectional I/O port with internal pull-ups. Port 3 pins that have 1s
written to them are pulled high by the internal pull-ups and can be used as inputs. As inputs,
port 3 pins that are externally being pulled low will source current because of the pull-ups.
(See DC Electrical Characteristics: IIL). Port 3 also serves the special features of the 80C51
family, as listed below:
10 11 5 I RxD (P3.0): Serial input port
11 13 7 O TxD (P3.1): Serial output port
12 14 8 I INT0 (P3.2): External interrupt
13 15 9 I INT1 (P3.3): External interrupt
14 16 10 IT0 (P3.4): T imer 0 external input
15 17 11 IT1 (P3.5): Timer 1 external input
16 18 12 OWR (P3.6): External data memory write strobe
17 19 13 ORD (P3.7): External data memory read strobe
RST 9 10 4 I Reset: A high on this pin for two machine cycles while the oscillator is running, resets the
device. An internal diffused resistor to VSS permits a power-on reset using only an external
capacitor to VCC.
ALE/PROG 30 33 27 O Address Latch Enable/Program Pulse: Output pulse for latching the low byte of the
address during an access to external memory. In normal operation, ALE is emitted at a
constant rate of 1/6 the oscillator frequency, and can be used for external timing or clocking.
Note that one ALE pulse is skipped during each access to external data memory. This pin is
also the program pulse input (PROG) during EPROM programming. ALE can be disabled by
setting SFR auxiliary.0. With this bit set, ALE will be active only during a MOVX instruction.
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33 MHz)
1999 Apr 01 6
PIN DESCRIPTIONS (Continued)
PIN NUMBER
MNEMONIC DIP LCC QFP TYPE NAME AND FUNCTION
PSEN 29 32 26 OProgram Store Enable: The read strobe to external program memory. When executing
code from the external program memory, PSEN is activated twice each machine cycle,
except that two PSEN activations are skipped during each access to external data memory.
PSEN is not activated during fetches from internal program memory.
EA/VPP 31 35 29 IExternal Access Enable/Programming Supply Voltage: EA must be externally held low
to enable the device to fetch code from external program memory locations starting with
0000H. If EA is held high, the device executes from internal program memory unless the
program counter contains an address greater than 8k Devices (IFFFH), 16k Devices
(3FFFH) or 32k Devices (7FFFH). Since the RD+ has 64k Internal Memory, the RD+ will
execute only from internal memory when EA is held high. This pin also receives the 12.75V
programming supply voltage (VPP) during EPROM programming. If security bit 1 is
programmed, EA will be internally latched on Reset.
XTAL1 19 21 15 ICrystal 1: Input to the inverting oscillator amplifier and input to the internal clock generator
circuits.
XTAL2 18 20 14 OCrystal 2: Output from the inverting oscillator amplifier.
NOTE:
To avoid “latch-up” effect at power-on, the voltage on any pin at any time must not be higher than VCC + 0.5V or VSS – 0.5V, respectively.
80C51 8-bit microcontroller family
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
71999 Apr 01
8XC52/54/58 AND 80C32 ORDERING INFORMATION
MEMORY SIZE
8K × 8 MEMOR Y SIZE
16K × 8 MEMORY SIZE
32K × 8 ROMless TEMPERATURE RANGE °C
AND PACKAGE VOLTAGE
RANGE FREQ.
(MHz) DWG.
#
ROM P80C52SBPN P80C54SBPN P80C58SBPN
P80C32SBPN
0 to +70 Plastic Dual In line Package
27Vto55V
0to16
SOT129 1
OTP P87C52SBPN P87C54SBPN P87C58SBPN
P80C32SBPN
0
to
+
70
,
Plastic
D
u
al
In
-
line
Package
2
.
7V
to
5
.
5V
0
to
16
SOT129
-
1
ROM P80C52SBAA P80C54SBAA P80C58SBAA
P80C32SBAA
0 to +70 Plastic Leaded Chi
p
Carrier
27Vto55V
0to16
SOT187 2
OTP P87C52SBAA P87C54SBAA P87C58SBAA
P80C32SBAA
0
to
+
70
,
Plastic
Leaded
Chip
Carrier
2
.
7V
to
5
.
5V
0
to
16
SOT187
-
2
ROM P80C52SBBB P80C54SBBB P80C58SBBB
P80C32SBBB
0 to +70 Plastic Quad Flat Pack
27Vto55V
0to16
SOT307 2
OTP P87C52SBBB P87C54SBBB P87C58SBBB
P80C32SBBB
0
to
+
70
,
Plastic
Q
u
ad
Flat
Pack
2
.
7V
to
5
.
5V
0
to
16
SOT307
-
2
ROM P80C52SFPN P80C54SFPN P80C58SFPN
P80C32SFPN
40 to +85 Plastic Dual In line Package
27Vto55V
0to16
SOT129 1
OTP P87C52SFPN P87C54SFPN P87C58SFPN
P80C32SFPN
–
40
to
+
85
,
Plastic
D
u
al
In
-
line
Package
2
.
7V
to
5
.
5V
0
to
16
SOT129
-
1
ROM P80C52SFAA P80C54SFAA P80C58SFAA
P80C32SFAA
40 to +85 Plastic Leaded Chi
p
Carrier
27Vto55V
0to16
SOT187 2
OTP P87C52SFAA P87C54SFAA P87C58SFAA
P80C32SFAA
–
40
to
+
85
,
Plastic
Leaded
Chip
Carrier
2
.
7V
to
5
.
5V
0
to
16
SOT187
-
2
ROM P80C52SFBB P80C54SFBB P80C58SFBB
P80C32SFBB
40 to +85 Plastic Quad Flat Pack
27Vto55V
0to16
SOT307 2
OTP P87C52SFBB P87C54SFBB P87C58SFBB
P80C32SFBB
–
40
to
+
85
,
Plastic
Q
u
ad
Flat
Pack
2
.
7V
to
5
.
5V
0
to
16
SOT307
-
2
ROM P80C52UBAA P80C54UBAA P80C58UBAA
P80C32UBAA
0 to +70 Plastic Leaded Chi
p
Carrier
5V
0to33
SOT187 2
OTP P87C52UBAA P87C54UBAA P87C58UBAA
P80C32UBAA
0
to
+
70
,
Plastic
Leaded
Chip
Carrier
5V
0
to
33
SOT187
-
2
ROM P80C52UBPN P80C54UBPN P80C58UBPN
P80C32UBPN
0 to +70 Plastic Dual In line Package
5V
0to33
SOT129 1
OTP P87C52UBPN P87C54UBPN P87C58UBPN
P80C32UBPN
0
to
+
70
,
Plastic
D
u
al
In
-
line
Package
5V
0
to
33
SOT129
-
1
ROM P80C52UBBB P80C54UBBB P80C58UBBB
P80C32UBBB
0 to +70 Plastic Quad Flat Pack
5V
0to33
SOT307 2
OTP P87C52UBBB P87C54UBBB P87C58UBBB
P80C32UBBB
0
to
+
70
,
Plastic
Q
u
ad
Flat
Pack
5V
0
to
33
SOT307
-
2
ROM P80C52UFAA P80C54UFAA P80C58UFAA
P80C32UFAA
40 to +85 Plastic Leaded Chi
p
Carrier
5V
0to33
SOT187 2
OTP P87C52UFAA P87C54UFAA P87C58UFAA
P80C32UFAA
–
40
to
+
85
,
Plastic
Leaded
Chip
Carrier
5V
0
to
33
SOT187
-
2
ROM P80C52UFPN P80C54UFPN P80C58UFPN
P80C32UFPN
40 to +85 Plastic Dual In line Package
5V
0to33
SOT129 1
OTP P87C52UFPN P87C54UFPN P87C58UFPN
P80C32UFPN
–
40
to
+
85
,
Plastic
D
u
al
In
-
line
Package
5V
0
to
33
SOT129
-
1
ROM P80C52UFBB P80C54UFBB P80C58UFBB
P80C32UFBB
40 to +85 Plastic Quad Flat Pack
5V
0to33
SOT307 2
OTP P87C52UFBB P87C54UFBB P87C58UFBB
P80C32UFBB
–
40
to
+
85
,
Plastic
Q
u
ad
Flat
Pack
5V
0
to
33
SOT307
-
2
Note: For Multi Time Programmable devices, See P89C51RX+ Flash datasheet.
80C51 8-bit microcontroller family
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
81999 Apr 01
8XC51FA/FB/FC AND 80C51FA ORDERING INFORMATION
MEMORY SIZE
8K × 8 MEMORY SIZE
16K × 8 MEMOR Y SIZE
32K × 8 ROMless TEMPERATURE RANGE °C
AND PACKAGE VOLTAGE
RANGE FREQ.
(MHz) DWG.
#
ROM P83C51FA–4N P83C51FB–4N P83C51FC–4N
P80C51FA 4N
27Vto55V
0to16
SOT129 1
OTP P87C51FA–4N P87C51FB–4N P87C51FC–4N
P80C51FA
–
4N
+
,
-
u
-
.
2
.
7V
to
5
.
5V
0
to
16
SOT129
-
1
ROM P83C51FA–4A P83C51FB–4A P83C51FC–4A
P80C51FA 4A
p
27Vto55V
0to16
SOT187 2
OTP P87C51FA–4A P87C51FB–4A P87C51FC–4A
P80C51FA
–
4A
+
,
-
2
.
7V
to
5
.
5V
0
to
16
SOT187
-
2
ROM P83C51FA–4B P83C51FB–4B P83C51FC–4B
P80C51FA 4B
27Vto55V
0to16
SOT307 2
OTP P87C51FA–4B P87C51FB–4B P87C51FC–4B
P80C51FA
–
4B
+
,
-
u
2
.
7V
to
5
.
5V
0
to
16
SOT307
-
2
ROM P83C51FA–5N P83C51FB–5N P83C51FC–5N
P80C51FA 5N
27Vto55V
0to16
SOT129 1
OTP P87C51FA–5N P87C51FB–5N P87C51FC–5N
P80C51FA
–
5N
–
+
,
-
u
-
.
2
.
7V
to
5
.
5V
0
to
16
SOT129
-
1
ROM P83C51FA–5A P83C51FB–5A P83C51FC–5A
P80C51FA 5A
p
27Vto55V
0to16
SOT187 2
OTP P87C51FA–5A P87C51FB–5A P87C51FC–5A
P80C51FA
–
5A
–
+
,
-
2
.
7V
to
5
.
5V
0
to
16
SOT187
-
2
ROM P83C51FA–5B P83C51FB–5B P83C51FC–5B
P80C51FA 5B
27Vto55V
0to16
SOT307 2
OTP P87C51FA–5B P87C51FB–5B P87C51FC–5B
P80C51FA
–
5B
–
+
,
-
u
2
.
7V
to
5
.
5V
0
to
16
SOT307
-
2
ROM P83C51FA–IN P83C51FB–IN P83C51FC–IN
P80C51FA IN
5V
0to33
SOT129 1
OTP P87C51FA–IN P87C51FB–IN P87C51FC–IN
P80C51FA
–
IN
+
,
-
u
-
.
5V
0
to
33
SOT129
-
1
ROM P83C51FA–IA P83C51FB–IA P83C51FC–IA
P80C51FA IA
p
5V
0to33
SOT187 2
OTP P87C51FA–IA P87C51FB–IA P87C51FC–IA
P80C51FA
–
IA
+
,
-
5V
0
to
33
SOT187
-
2
ROM P83C51FA–IB P83C51FB–IB P83C51FC–IB
P80C51FA IB
5V
0to33
SOT307 2
OTP P87C51FA–IB P87C51FB–IB P87C51FC–IB
P80C51FA
–
IB
+
,
-
u
5V
0
to
33
SOT307
-
2
ROM P83C51FA–JN P83C51FB–JN P83C51FC–JN
P80C51FA JN
5V
0to33
SOT129 1
OTP P87C51FA–JN P87C51FB–JN P87C51FC–JN
P80C51FA
–
JN
–
+
,
-
u
-
.
5V
0
to
33
SOT129
-
1
ROM P83C51FA–JA P83C51FB–JA P83C51FC–JA
P80C51FA JA
p
5V
0to33
SOT187 2
OTP P87C51FA–JA P87C51FB–JA P87C51FC–JA
P80C51FA
–
JA
–
+
,
-
5V
0
to
33
SOT187
-
2
ROM P83C51FA–JB P83C51FB–JB P83C51FC–JB
P80C51FA JB
5V
0to33
SOT307 2
OTP P87C51FA–JB P87C51FB–JB P87C51FC–JB
P80C51FA
–
JB
–
+
,
-
u
5V
0
to
33
SOT307
-
2
Note: For Multi Time Programmable devices, See P89C51RX+ Flash datasheet.
80C51 8-bit microcontroller family
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
91999 Apr 01
87C51RA+/RB+/RC+/RD+ AND 80C51RA+ ORDERING INFORMATION
MEMORY SIZE
8K × 8 MEMORY SIZE
16K × 8 MEMORY SIZE
32K × 8 MEMORY SIZE
64K × 8 ROMless TEMPERATURE RANGE °C
AND PACKAGE VOLTAGE
RANGE FREQ.
(MHz) DWG.
#
ROM P83C51RA+4N P83C51RB+4N P83C51RC+4N P83C51RD+4N
P80C51RA+4N
0 to +70,
27Vto55V
0to16
SOT129 1
OTP P87C51RA+4N P87C51RB+4N P87C51RC+4N P87C51RD+4N
P80C51RA
+
4N
,
40-Pin Plastic Dual In-line Pkg.
2
.
7V
to
5
.
5V
0
to
16
SOT129
-
1
ROM P83C51RA+4A P83C51RB+4A P83C51RC+4A P83C51RD+4A
P80C51RA+4A
0 to +70,
27Vto55V
0to16
SOT187 2
OTP P87C51RA+4A P87C51RB+4A P87C51RC+4A P87C51RD+4A
P80C51RA
+
4A
,
44-Pin Plastic Leaded Chip Carrier
2
.
7V
to
5
.
5V
0
to
16
SOT187
-
2
ROM P83C51RA+4B P83C51RB+4B P83C51RC+4B P83C51RD+4B
P80C51RA+4B
0 to +70,
27Vto55V
0to16
SOT307 2
OTP P87C51RA+4B P87C51RB+4B P87C51RC+4B P87C51RD+4B
P80C51RA
+
4B
,
44-Pin Plastic Quad Flat Pack
2
.
7V
to
5
.
5V
0
to
16
SOT307
-
2
ROM P83C51RA+5N P83C51RB+5N P83C51RC+5N P83C51RD+5N
P80C51RA+5N
–40 to +85,
27Vto55V
0to16
SOT129 1
OTP P87C51RA+5N P87C51RB+5N P87C51RC+5N P87C51RD+5N
P80C51RA
+
5N
,
40-Pin Plastic Dual In-line Pkg.
2
.
7V
to
5
.
5V
0
to
16
SOT129
-
1
ROM P83C51RA+5A P83C51RB+5A P83C51RC+5A P83C51RD+5A
P80C51RA+5A
–40 to +85,
27Vto55V
0to16
SOT187 2
OTP P87C51RA+5A P87C51RB+5A P87C51RC+5A P87C51RD+5A
P80C51RA
+
5A
,
44-Pin Plastic Leaded Chip Carrier
2
.
7V
to
5
.
5V
0
to
16
SOT187
-
2
ROM P83C51RA+5B P83C51RB+5B P83C51RC+5B P83C51RD+5B
P80C51RA+5B
–40 to +85,
27Vto55V
0to16
SOT307 2
OTP P87C51RA+5B P87C51RB+5B P87C51RC+5B P87C51RD+5B
P80C51RA
+
5B
,
44-Pin Plastic Quad Flat Pack
2
.
7V
to
5
.
5V
0
to
16
SOT307
-
2
ROM P83C51RA+IN P83C51RB+IN P83C51RC+IN P83C51RD+IN
P80C51RA+IN
0 to +70,
5V
0to33
SOT129 1
OTP P87C51RA+IN P87C51RB+IN P87C51RC+IN P87C51RD+IN
P80C51RA
+
IN
,
40-Pin Plastic Dual In-line Pkg.
5V
0
to
33
SOT129
-
1
ROM P83C51RA+IA P83C51RB+IA P83C51RC+IA P83C51RD+IA
P80C51RA+IA
0 to +70,
5V
0to33
SOT187 2
OTP P87C51RA+IA P87C51RB+IA P87C51RC+IA P87C51RD+IA
P80C51RA
+
IA
,
44-Pin Plastic Leaded Chip Carrier
5V
0
to
33
SOT187
-
2
ROM P83C51RA+IB P83C51RB+IB P83C51RC+IB P83C51RD+IB
P80C51RA+IB
0 to +70,
5V
0to33
SOT307 2
OTP P87C51RA+IB P87C51RB+IB P87C51RC+IB P87C51RD+IB
P80C51RA
+
IB
,
44-Pin Plastic Quad Flat Pack
5V
0
to
33
SOT307
-
2
ROM P83C51RA+JN P83C51RB+JN P83C51RC+JN P83C51RD+JN
P80C51RA+JN
–40 to +85,
5V
0to33
SOT129 1
OTP P87C51RA+JN P87C51RB+JN P87C51RC+JN P87C51RD+JN
P80C51RA
+
JN
,
40-Pin Plastic Dual In-line Pkg.
5V
0
to
33
SOT129
-
1
ROM P83C51RA+JA P83C51RB+JA P83C51RC+JA P83C51RD+JA
P80C51RA+JA
–40 to +85,
5V
0to33
SOT187 2
OTP P87C51RA+JA P87C51RB+JA P87C51RC+JA P87C51RD+JA
P80C51RA
+
JA
,
44-Pin Plastic Leaded Chip Carrier
5V
0
to
33
SOT187
-
2
ROM P83C51RA+JB P83C51RB+JB P83C51RC+JB P83C51RD+JB
P80C51RA+JB
–40 to +85,
5V
0to33
SOT307-2
OTP P87C51RA+JB P87C51RB+JB P87C51RC+JB P87C51RD+JB
P80C51RA+JB
,
44-Pin Plastic Quad Flat Pack
5V
0
to
33
SOT307
-
2
Note: For Multi Time Programmable devices, See P89C51RX+ Flash datasheet.
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 10
Table 1. 8XC52/54/58/80C32 Special Function Registers
SYMBOL DESCRIPTION DIRECT
ADDRESS BIT ADDRESS, SYMBOL, OR ALTERNATIVE PORT FUNCTION
MSB LSB RESET
VALUE
ACC* Accumulator E0H E7 E6 E5 E4 E3 E2 E1 E0 00H
AUXR# Auxiliary 8EH – – – – – – – AO xxxxxxx0B
AUXR1# Auxiliary 1 A2H – – – LPEP3GF3 0 – DPS xxx0xxx0B
B* B register F0H F7 F6 F5 F4 F3 F2 F1 F0 00H
DPTR: Data Pointer (2 bytes)
DPH Data Pointer High 83H 00H
DPL Data Pointer Low 82H 00H
AF AE AD AC AB AA A9 A8
IE* Interrupt Enable A8H EA – ET2 ES ET1 EX1 ET0 EX0 0x000000B
BF BE BD BC BB BA B9 B8
IP* Interrupt Priority B8H – – PT2 PS PT1 PX1 PT0 PX0 xx000000B
B7 B6 B5 B4 B3 B2 B1 B0
IPH# Interrupt Priority High B7H – – PT2H PSH PT1H PX1H PT0H PX0H xx000000B
87 86 85 84 83 82 81 80
P0* Port 0 80H AD7 AD6 AD5 AD4 AD3 AD2 AD1 AD0 FFH
97 96 95 94 93 92 91 90
P1* Port 1 90H – – – – – – T2EX T2 FFH
A7 A6 A5 A4 A3 A2 A1 A0
P2* Port 2 A0H AD15 AD14 AD13 AD12 AD11 AD10 AD9 AD8 FFH
B7 B6 B5 B4 B3 B2 B1 B0
P3* Port 3 B0H RD WR T1 T0 INT1 INT0 TxD RxD FFH
PCON#1Power Control 87H SMOD1 SMOD0 – POF2GF1 GF0 PD IDL 00xx0000B
D7 D6 D5 D4 D3 D2 D1 D0
PSW* Program Status Word D0H CY AC F0 RS1 RS0 OV – P 000000x0B
RCAP2H#Timer 2 Capture High CBH 00H
RCAP2L#Timer 2 Capture Low CAH 00H
SADDR# Slave Address A9H 00H
SADEN# Slave Address Mask B9H 00H
SBUF Serial Data Buffer 99H xxxxxxxxB
9F 9E 9D 9C 9B 9A 99 98
SCON* Serial Control 98H SM0/FE SM1 SM2 REN TB8 RB8 TI RI 00H
SP Stack Pointer 81H 07H
8F 8E 8D 8C 8B 8A 89 88
TCON* T imer Control 88H TF1 TR1 TF0 TR0 IE1 IT1 IE0 IT0 00H
CF CE CD CC CB CA C9 C8
T2CON* T imer 2 Control C8H TF2 EXF2 RCLK TCLK EXEN2 TR2 C/T2 CP/RL2 00H
T2MOD# Timer 2 Mode Control C9H – – – – – – T2OE DCEN xxxxxx00B
TH0 T imer High 0 8CH 00H
TH1 T imer High 1 8DH 00H
TH2# Timer High 2 CDH 00H
TL0 T imer Low 0 8AH 00H
TL1 Timer Low 1 8BH 00H
TL2# Timer Low 2 CCH 00H
TMOD T imer Mode 89H GATE C/T M1 M0 GA TE C/T M1 M0 00H
* SFRs are bit addressable.
# SFRs are modified from or added to the 80C51 SFRs.
– Reserved bits.
1. Reset value depends on reset source.
2. Bit will not be affected by Reset.
3. LPEP – Low Power OTP–EPROM only operation.
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 11
Table 2. 8XC51FA/FB/FC, 8XC51RA+/RB+/RC+/RD+ Special Function Registers
SYMBOL DESCRIPTION DIRECT
ADDRESS BIT ADDRESS, SYMBOL, OR ALTERNATIVE PORT FUNCTION
MSB LSB RESET
VALUE
ACC* Accumulator E0H E7 E6 E5 E4 E3 E2 E1 E0 00H
AUXR# Auxiliary 8EH – – – – – – EXTRAM
(RX+ only) AO xxxxxx00B
AUXR1# Auxiliary 1 A2H – – – LPEP3GF3 0 – DPS xxx0xxx0B
B* B register F0H F7 F6 F5 F4 F3 F2 F1 F0 00H
CCAP0H# Module 0 Capture High FAH xxxxxxxxB
CCAP1H# Module 1 Capture High FBH xxxxxxxxB
CCAP2H# Module 2 Capture High FCH xxxxxxxxB
CCAP3H# Module 3 Capture High FDH xxxxxxxxB
CCAP4H# Module 4 Capture High FEH xxxxxxxxB
CCAP0L# Module 0 Capture Low EAH xxxxxxxxB
CCAP1L# Module 1 Capture Low EBH xxxxxxxxB
CCAP2L# Module 2 Capture Low ECH xxxxxxxxB
CCAP3L# Module 3 Capture Low EDH xxxxxxxxB
CCAP4L# Module 4 Capture Low EEH xxxxxxxxB
CCAPM0# Module 0 Mode DAH – ECOM CAPP CAPN MAT TOG PWM ECCF x0000000B
CCAPM1# Module 1 Mode DBH – ECOM CAPP CAPN MAT TOG PWM ECCF x0000000B
CCAPM2# Module 2 Mode DCH – ECOM CAPP CAPN MAT TOG PWM ECCF x0000000B
CCAPM3# Module 3 Mode DDH – ECOM CAPP CAPN MAT TOG PWM ECCF x0000000B
CCAPM4# Module 4 Mode DEH – ECOM CAPP CAPN MAT TOG PWM ECCF x0000000B
DF DE DD DC DB DA D9 D8
CCON*# PCA Counter Control D8H CF CR – CCF4 CCF3 CCF2 CCF1 CCF0 00x00000B
CH# PCA Counter High F9H 00H
CL# PCA Counter Low E9H 00H
CMOD# PCA Counter Mode D9H CIDL WDTE – – – CPS1 CPS0 ECF 00xxx000B
DPTR: Data Pointer (2 bytes)
DPH Data Pointer High 83H 00H
DPL Data Pointer Low 82H 00H
AF AE AD AC AB AA A9 A8
IE* Interrupt Enable A8H EA EC ET2 ES ET1 EX1 ET0 EX0 00H
BF BE BD BC BB BA B9 B8
IP* Interrupt Priority B8H – PPC PT2 PS PT1 PX1 PT0 PX0 x0000000B
B7 B6 B5 B4 B3 B2 B1 B0
IPH# Interrupt Priority High B7H – PPCH PT2H PSH PT1H PX1H PT0H PX0H x0000000B
87 86 85 84 83 82 81 80
P0* Port 0 80H AD7 AD6 AD5 AD4 AD3 AD2 AD1 AD0 FFH
97 96 95 94 93 92 91 90
P1* Port 1 90H CEX4 CEX3 CEX2 CEX1 CEX0 ECI T2EX T2 FFH
A7 A6 A5 A4 A3 A2 A1 A0
P2* Port 2 A0H AD15 AD14 AD13 AD12 AD11 AD10 AD9 AD8 FFH
B7 B6 B5 B4 B3 B2 B1 B0
P3* Port 3 B0H RD WR T1 T0 INT1 INT0 TxD RxD FFH
PCON#1Power Control 87H SMOD1 SMOD0 – POF2GF1 GF0 PD IDL 00xx0000B
* SFRs are bit addressable.
# SFRs are modified from or added to the 80C51 SFRs.
– Reserved bits.
1. Reset value depends on reset source.
2. Bit will not be affected by Reset.
3. LPEP – Low Power OTP–EPROM only operation.
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 12
Table 2. 8XC51FA/FB/FC, 8XC51RA+/RB+/RC+/RD+ Special Function Registers (Continued)
SYMBOL DESCRIPTION DIRECT
ADDRESS BIT ADDRESS, SYMBOL, OR ALTERNATIVE PORT FUNCTION
MSB LSB RESET
VALUE
D7 D6 D5 D4 D3 D2 D1 D0
PSW* Program Status Word D0H CY AC F0 RS1 RS0 OV – P 000000x0B
RACAP2H#Timer 2 Capture High CBH 00H
RACAP2L#Timer 2 Capture Low CAH 00H
SADDR# Slave Address A9H 00H
SADEN# Slave Address Mask B9H 00H
SBUF Serial Data Buffer 99H xxxxxxxxB
9F 9E 9D 9C 9B 9A 99 98
SCON* Serial Control 98H SM0/FE SM1 SM2 REN TB8 RB8 TI RI 00H
SP Stack Pointer 81H 07H
8F 8E 8D 8C 8B 8A 89 88
TCON* T imer Control 88H TF1 TR1 TF0 TR0 IE1 IT1 IE0 IT0 00H
CF CE CD CC CB CA C9 C8
T2CON* T imer 2 Control C8H TF2 EXF2 RCLK TCLK EXEN2 TR2 C/T2 CP/RL2 00H
T2MOD# Timer 2 Mode Control C9H – – – – – – T2OE DCEN xxxxxx00B
TH0 T imer High 0 8CH 00H
TH1 T imer High 1 8DH 00H
TH2# Timer High 2 CDH 00H
TL0 T imer Low 0 8AH 00H
TL1 Timer Low 1 8BH 00H
TL2# Timer Low 2 CCH 00H
TMOD T imer Mode 89H GA TE C/T M1 M0 GA TE C/T M1 M0 00H
WDTRST HDW Watchdog
T imer Reset (RX+ only) 0A6H
* SFRs are bit addressable.
# SFRs are modified from or added to the 80C51 SFRs.
– Reserved bits.
OSCILLATOR CHARACTERISTICS
XTAL1 and XTAL2 are the input and output, respectively, of an
inverting amplifier. The pins can be configured for use as an on-chip
oscillator.
To drive the device from an external clock source, XTAL1 should be
driven while XTAL2 is left unconnected. There are no requirements
on the duty cycle of the external clock signal, because the input to
the internal clock circuitry is through a divide-by-two flip-flop.
However, minimum and maximum high and low times specified in
the data sheet must be observed.
RESET
A reset is accomplished by holding the RST pin high for at least two
machine cycles (24 oscillator periods), while the oscillator is running.
To insure a good power-on reset, the RST pin must be high long
enough to allow the oscillator time to start up (normally a few
milliseconds) plus two machine cycles. At power-on, the voltage on
VCC and RST must come up at the same time for a proper start-up.
Ports 1, 2, and 3 will asynchronously be driven to their reset
condition when a voltage above VIH1 (min.) is applied to RESET.
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 13
LOW POWER MODES
Stop Clock Mode
The static design enables the clock speed to be reduced down to
0 MHz (stopped). When the oscillator is stopped, the RAM and
Special Function Registers retain their values. This mode allows
step-by-step utilization and permits reduced system power
consumption by lowering the clock frequency down to any value. For
lowest power consumption the Power Down mode is suggested.
Idle Mode
In the idle mode (see Table 3), the CPU puts itself to sleep while all
of the on-chip peripherals stay active. The instruction to invoke the
idle mode is the last instruction executed in the normal operating
mode before the idle mode is activated. The CPU contents, the
on-chip RAM, and all of the special function registers remain intact
during this mode. The idle mode can be terminated either by any
enabled interrupt (at which time the process is picked up at the
interrupt service routine and continued), or by a hardware reset
which starts the processor in the same manner as a power-on reset.
Power-Down Mode
To save even more power, a Power Down mode (see Table 3) can
be invoked by software. In this mode, the oscillator is stopped and
the instruction that invoked Power Down is the last instruction
executed. The on-chip RAM and Special Function Registers retain
their values down to 2.0V and care must be taken to return VCC to
the minimum specified operating voltages before the Power Down
Mode is terminated.
Either a hardware reset or external interrupt can be used to exit from
Power Down. Reset redefines all the SFRs but does not change the
on-chip RAM. An external interrupt allows both the SFRs and the
on-chip RAM to retain their values.
To properly terminate Power Down the reset or external interrupt
should not be executed before VCC is restored to its normal
operating level and must be held active long enough for the
oscillator to restart and stabilize (normally less than 10ms).
With an external interrupt, INT0 and INT1 must be enabled and
configured as level-sensitive. Holding the pin low restarts the oscillator
but bringing the pin back high completes the exit. Once the interrupt
is serviced, the next instruction to be executed after RETI will be the
one following the instruction that put the device into Power Down.
LPEP
The LPEP bit (AUXR.4), only needs to be set for applications
operating at VCC less than 4V.
POWER OFF FLAG
The Power Off Flag (POF) is set by on-chip circuitry when the VCC
level on the 8XC51FX/8XC51RX+ rises from 0 to 5V. The POF bit
can be set or cleared by software allowing a user to determine if the
reset is the result of a power-on or a warm start after powerdown.
The VCC level must remain above 3V for the POF to remain
unaf fected by the VCC level.
Design Consideration
•When the idle mode is terminated by a hardware reset, the device
normally resumes program execution, from where it left off, up to
two machine cycles before the internal reset algorithm takes
control. On-chip hardware inhibits access to internal RAM in this
event, but access to the port pins is not inhibited. To eliminate the
possibility of an unexpected write when Idle is terminated by reset,
the instruction following the one that invokes Idle should not be
one that writes to a port pin or to external memory.
ONCE Mode
The ONCE (“On-Circuit Emulation”) Mode facilitates testing and
debugging of systems without the device having to be removed from
the circuit. The ONCE Mode is invoked by:
1. Pull ALE low while the device is in reset and PSEN is high;
2. Hold ALE low as RST is deactivated.
While the device is in ONCE Mode, the Port 0 pins go into a float
state, and the other port pins and ALE and PSEN are weakly pulled
high. The oscillator circuit remains active. While the device is in this
mode, an emulator or test CPU can be used to drive the circuit.
Normal operation is restored when a normal reset is applied.
Programmable Clock-Out
A 50% duty cycle clock can be programmed to come out on P1.0.
This pin, besides being a regular I/O pin, has two alternate
functions. It can be programmed:
1. to input the external clock for Timer/Counter 2, or
2. to output a 50% duty cycle clock ranging from 61Hz to 4MHz at a
16MHz operating frequency.
To configure the Timer/Counter 2 as a clock generator, bit C/T2 (in
T2CON) must be cleared and bit T20E in T2MOD must be set. Bit
TR2 (T2CON.2) also must be set to start the timer.
The Clock-Out frequency depends on the oscillator frequency and
the reload value of T imer 2 capture registers (RCAP2H, RCAP2L)
as shown in this equation:
Oscillator Frequency
4(65536 RCAP2H,RCAP2L)
Where (RCAP2H,RCAP2L) = the content of RCAP2H and RCAP2L
taken as a 16-bit unsigned integer.
In the Clock-Out mode T imer 2 roll-overs will not generate an
interrupt. This is similar to when it is used as a baud-rate generator.
It is possible to use T imer 2 as a baud-rate generator and a clock
generator simultaneously. Note, however, that the baud-rate and the
Clock-Out frequency will be the same.
Table 3. External Pin Status During Idle and Power-Down Mode
MODE PROGRAM MEMOR Y ALE PSEN PORT 0 PORT 1 PORT 2 PORT 3
Idle Internal 1 1 Data Data Data Data
Idle External 1 1 Float Data Address Data
Power-down Internal 0 0 Data Data Data Data
Power-down External 0 0 Float Data Data Data
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 14
TIMER 2 OPERATION
Timer 2
T imer 2 is a 16-bit Timer/Counter which can operate as either an
event timer or an event counter, as selected by C/T2* in the special
function register T2CON (see Figure 1). T imer 2 has three operating
modes: Capture, Auto-reload (up or down counting), and Baud Rate
Generator, which are selected by bits in the T2CON as shown in
Table 4.
Capture Mode
In the capture mode there are two options which are selected by bit
EXEN2 in T2CON. If EXEN2=0, then timer 2 is a 16-bit timer or
counter (as selected by C/T2* in T2CON) which, upon overflowing
sets bit TF2, the timer 2 overflow bit. This bit can be used to
generate an interrupt (by enabling the T imer 2 interrupt bit in the
IE register). If EXEN2= 1, T imer 2 operates as described above, but
with the added feature that a 1-to-0 transition at external input T2EX
causes the current value in the T imer 2 registers, TL2 and TH2, to
be captured into registers RCAP2L and RCAP2H, respectively. In
addition, the transition at T2EX causes bit EXF2 in T2CON to be
set, and EXF2 like TF2 can generate an interrupt (which vectors to
the same location as T imer 2 overflow interrupt. The Timer 2
interrupt service routine can interrogate TF2 and EXF2 to determine
which event caused the interrupt). The capture mode is illustrated in
Figure 2. (There is no reload value for TL2 and TH2 in this mode.
Even when a capture event occurs from T2EX, the counter keeps on
counting T2EX pin transitions or osc/12 pulses.)
Auto-Reload Mode (Up or Down Counter)
In the 16-bit auto-reload mode, T imer 2 can be configured (as either
a timer or counter [C/T2* in T2CON]) then programmed to count up
or down. The counting direction is determined by bit DCEN (Down
Counter Enable) which is located in the T2MOD register (see
Figure 3). When reset is applied the DCEN=0 which means T imer 2
will default to counting up. If DCEN bit is set, T imer 2 can count up
or down depending on the value of the T2EX pin.
Figure 4 shows T imer 2 which will count up automatically since
DCEN=0. In this mode there are two options selected by bit EXEN2
in T2CON register. If EXEN2=0, then Timer 2 counts up to 0FFFFH
and sets the TF2 (Overflow Flag) bit upon overflow. This causes the
T imer 2 registers to be reloaded with the 16-bit value in RCAP2L
and RCAP2H. The values in RCAP2L and RCAP2H are preset by
software means.
If EXEN2=1, then a 16-bit reload can be triggered either by an
overflow or by a 1-to-0 transition at input T2EX. This transition also
sets the EXF2 bit. The T imer 2 interrupt, if enabled, can be
generated when either TF2 or EXF2 are 1.
In Figure 5 DCEN=1, which enables T imer 2 to count up or down.
This mode allows pin T2EX to control the direction of count. When a
logic 1 is applied at pin T2EX T imer 2 will count up. Timer 2 will
overflow at 0FFFFH and set the TF2 flag, which can then generate
an interrupt, if the interrupt is enabled. This timer overflow also
causes the 16–bit value in RCAP2L and RCAP2H to be reloaded
into the timer registers TL2 and TH2.
When a logic 0 is applied at pin T2EX this causes T imer 2 to count
down. The timer will underflow when TL2 and TH2 become equal to
the value stored in RCAP2L and RCAP2H. T imer 2 underflow sets
the TF2 flag and causes 0FFFFH to be reloaded into the timer
registers TL2 and TH2.
The external flag EXF2 toggles when T imer 2 underflows or
overflows. This EXF2 bit can be used as a 17th bit of resolution if
needed. The EXF2 flag does not generate an interrupt in this mode
of operation.
(MSB) (LSB)
Symbol Position Name and Significance
TF2 T2CON.7 Timer 2 overflow flag set by a Timer 2 overflow and must be cleared by software. TF2 will not be set
when either RCLK or TCLK = 1.
EXF2 T2CON.6 Timer 2 external flag set when either a capture or reload is caused by a negative transition on T2EX and
EXEN2 = 1. When T imer 2 interrupt is enabled, EXF2 = 1 will cause the CPU to vector to the Timer 2
interrupt routine. EXF2 must be cleared by software. EXF2 does not cause an interrupt in up/down
counter mode (DCEN = 1).
RCLK T2CON.5 Receive clock flag. When set, causes the serial port to use Timer 2 overflow pulses for its receive clock
in modes 1 and 3. RCLK = 0 causes T imer 1 overflow to be used for the receive clock.
TCLK T2CON.4 T ransmit clock flag. When set, causes the serial port to use Timer 2 overflow pulses for its transmit clock
in modes 1 and 3. TCLK = 0 causes T imer 1 overflows to be used for the transmit clock.
EXEN2 T2CON.3 Timer 2 external enable flag. When set, allows a capture or reload to occur as a result of a negative
transition on T2EX if T imer 2 is not being used to clock the serial port. EXEN2 = 0 causes Timer 2 to
ignore events at T2EX.
TR2 T2CON.2 Start/stop control for Timer 2. A logic 1 starts the timer .
C/T2 T2CON.1 Timer or counter select. (Timer 2)
0 = Internal timer (OSC/12)
1 = External event counter (falling edge triggered).
CP/RL2 T2CON.0 Capture/Reload flag. When set, captures will occur on negative transitions at T2EX if EXEN2 = 1. When
cleared, auto-reloads will occur either with T imer 2 overflows or negative transitions at T2EX when
EXEN2 = 1. When either RCLK = 1 or TCLK = 1, this bit is ignored and the timer is forced to auto-reload
on T imer 2 overflow.
TF2 EXF2 RCLK TCLK EXEN2 TR2 C/T2 CP/RL2
SU00728
Figure 1. Timer/Counter 2 (T2CON) Control Register
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 15
Table 4. Timer 2 Operating Modes
RCLK + TCLK CP/RL2 TR2 MODE
0 0 1 16-bit Auto-reload
0 1 1 16-bit Capture
1 X 1 Baud rate generator
X X 0 (off)
OSC ÷ 12 C/T2 = 0
C/T2 = 1
TR2
Control
TL2
(8-bits) TH2
(8-bits) TF2
RCAP2L RCAP2H
EXEN2
Control
EXF2
Timer 2
Interrupt
T2EX Pin
Transition
Detector
T2 Pin
Capture
SU00066
Figure 2. Timer 2 in Capture Mode
Not Bit Addressable
Symbol Function
— Not implemented, reserved for future use.*
T2OE Timer 2 Output Enable bit.
DCEN Down Count Enable bit. When set, this allows Timer 2 to be configured as an up/down counter.
— — — — — — T2OE DCEN
SU00729
76543210
* User software should not write 1s to reserved bits. These bits may be used in future 8051 family products to invoke new features.
In that case, the reset or inactive value of the new bit will be 0, and its active value will be 1. The value read from a reserved bit is
indeterminate.
Bit
T2MOD Address = 0C9H Reset Value = XXXX XX00B
Figure 3. Timer 2 Mode (T2MOD) Control Register
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 16
OSC ÷ 12 C/T2 = 0
C/T2 = 1
TR2
CONTROL
TL2
(8-BITS) TH2
(8-BITS)
TF2
RCAP2L RCAP2H
EXEN2
CONTROL
EXF2
TIMER 2
INTERRUPT
T2EX PIN
TRANSITION
DETECTOR
T2 PIN
RELOAD
SU00067
Figure 4. Timer 2 in Auto-Reload Mode (DCEN = 0)
÷12 C/T2 = 0
C/T2 = 1
TL2 TH2
TR2
CONTROL
T2 PIN
SU00730
FFH FFH
RCAP2L RCAP2H
(UP COUNTING RELOAD VALUE) T2EX PIN
TF2 INTERRUPT
COUNT
DIRECTION
1 = UP
0 = DOWN
EXF2
OVERFLOW
(DOWN COUNTING RELOAD VALUE)
TOGGLE
OSC
Figure 5. Timer 2 Auto Reload Mode (DCEN = 1)
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 17
OSC ÷ 2 C/T2 = 0
C/T2 = 1
TR2
Control
TL2
(8-bits) TH2
(8-bits)
÷ 16
RCAP2L RCAP2H
EXEN2
Control
EXF2 Timer 2
Interrupt
T2EX Pin
Transition
Detector
T2 Pin
Reload
NOTE: OSC. Freq. is divided by 2, not 12. ÷ 2
“0” “1”
RX Clock
÷ 16 TX Clock
“0”“1”
“0”“1”
Timer 1
Overflow
Note availability of additional external interrupt.
SMOD
RCLK
TCLK
SU00068
Figure 6. Timer 2 in Baud Rate Generator Mode
Table 5. Timer 2 Generated Commonly Used
Baud Rates
Ba d Rate
Osc Freq
Timer 2
Ba
u
d
Rate
Osc
Freq
RCAP2H RCAP2L
375K 12MHz FF FF
9.6K 12MHz FF D9
2.8K 12MHz FF B2
2.4K 12MHz FF 64
1.2K 12MHz FE C8
300 12MHz FB 1E
110 12MHz F2 AF
300 6MHz FD 8F
110 6MHz F9 57
Baud Rate Generator Mode
Bits TCLK and/or RCLK in T2CON (Table 5) allow the serial port
transmit and receive baud rates to be derived from either T imer 1 or
T imer 2. When TCLK= 0, Timer 1 is used as the serial port transmit
baud rate generator. When TCLK= 1, Timer 2 is used as the serial
port transmit baud rate generator. RCLK has the same effect for the
serial port receive baud rate. With these two bits, the serial port can
have different receive and transmit baud rates – one generated by
T imer 1, the other by Timer 2.
Figure 6 shows the Timer 2 in baud rate generation mode. The baud
rate generation mode is like the auto-reload mode,in that a rollover
in TH2 causes the Timer 2 registers to be reloaded with the 16-bit
value in registers RCAP2H and RCAP2L, which are preset by
software.
The baud rates in modes 1 and 3 are determined by T imer 2’s
overflow rate given below:
Modes 1 and 3 Baud Rates +Timer 2 Overflow Rate
16
The timer can be configured for either “timer” or “counter” operation.
In many applications, it is configured for “timer” operation (C/T2*=0).
T imer operation is different for Timer 2 when it is being used as a
baud rate generator.
Usually, as a timer it would increment every machine cycle (i.e., 1/12
the oscillator frequency). As a baud rate generator, it increments
every state time (i.e., 1/2 the oscillator frequency). Thus the baud
rate formula is as follows:
Oscillator Frequency
[32 [65536 *(RCAP2H,RCAP2L)]]
Modes 1 and 3 Baud Rates =
Where: (RCAP2H, RCAP2L)= The content of RCAP2H and
RCAP2L taken as a 16-bit unsigned integer.
The T imer 2 as a baud rate generator mode shown in Figure 6, is
valid only if RCLK and/or TCLK = 1 in T2CON register. Note that a
rollover in TH2 does not set TF2, and will not generate an interrupt.
Thus, the T imer 2 interrupt does not have to be disabled when
T imer 2 is in the baud rate generator mode. Also if the EXEN2
(T2 external enable flag) is set, a 1-to-0 transition in T2EX
(T imer/counter 2 trigger input) will set EXF2 (T2 external flag) but
will not cause a reload from (RCAP2H, RCAP2L) to (TH2,TL2).
Therefore when Timer 2 is in use as a baud rate generator, T2EX
can be used as an additional external interrupt, if needed.
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 18
When T imer 2 is in the baud rate generator mode, one should not try
to read or write TH2 and TL2. As a baud rate generator, Timer 2 is
incremented every state time (osc/2) or asynchronously from pin T2;
under these conditions, a read or write of TH2 or TL2 may not be
accurate. The RCAP2 registers may be read, but should not be
written to, because a write might overlap a reload and cause write
and/or reload errors. The timer should be turned off (clear TR2)
before accessing the T imer 2 or RCAP2 registers.
Table 5 shows commonly used baud rates and how they can be
obtained from T imer 2.
Summary Of Baud Rate Equations
T imer 2 is in baud rate generating mode. If Timer 2 is being clocked
through pin T2(P1.0) the baud rate is:
Baud Rate +Timer 2 Overflow Rate
16
If T imer 2 is being clocked internally , the baud rate is:
Baud Rate +fOSC
[32 [65536 *(RCAP2H,RCAP2L)]]
Where fOSC= Oscillator Frequency
To obtain the reload value for RCAP2H and RCAP2L, the above
equation can be rewritten as:
RCAP2H,RCAP2L +65536 *ǒfOSC
32 Baud RateǓ
Timer/Counter 2 Set-up
Except for the baud rate generator mode, the values given for
T2CON do not include the setting of the TR2 bit. Therefore, bit TR2
must be set, separately, to turn the timer on. See Table 6 for set-up
of T imer 2 as a timer. Also see Table 7 for set-up of T imer 2 as a
counter.
Table 6. Timer 2 as a Timer
T2CON
MODE INTERNAL CONTROL
(Note 1) EXTERNAL CONTROL
(Note 2)
16-bit Auto-Reload 00H 08H
16-bit Capture 01H 09H
Baud rate generator receive and transmit same baud rate 34H 36H
Receive only 24H 26H
T ransmit only 14H 16H
Table 7. Timer 2 as a Counter
TMOD
MODE INTERNAL CONTROL
(Note 1) EXTERNAL CONTROL
(Note 2)
16-bit 02H 0AH
Auto-Reload 03H 0BH
NOTES:
1. Capture/reload occurs only on timer/counter overflow.
2. Capture/reload occurs on timer/counter overflow and a 1-to-0 transition on T2EX (P1.1) pin except when T imer 2 is used in the baud rate
generator mode.
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 19
Enhanced UART
The UART operates in all of the usual modes that are described in
the first section of
Data Handbook IC20, 80C51-Based 8-Bit
Microcontrollers
. In addition the UART can perform framing error
detect by looking for missing stop bits, and automatic address
recognition. The UAR T also fully supports multiprocessor
communication as does the standard 80C51 UART.
When used for framing error detect the UART looks for missing stop
bits in the communication. A missing bit will set the FE bit in the
SCON register. The FE bit shares the SCON.7 bit with SM0 and the
function of SCON.7 is determined by PCON.6 (SMOD0) (see
Figure 7). If SMOD0 is set then SCON.7 functions as FE. SCON.7
functions as SM0 when SMOD0 is cleared. When used as FE
SCON.7 can only be cleared by software. Refer to Figure 8.
Automatic Address Recognition
Automatic Address Recognition is a feature which allows the UART
to recognize certain addresses in the serial bit stream by using
hardware to make the comparisons. This feature saves a great deal
of software overhead by eliminating the need for the software to
examine every serial address which passes by the serial port. This
feature is enabled by setting the SM2 bit in SCON. In the 9 bit UART
modes, mode 2 and mode 3, the Receive Interrupt flag (RI) will be
automatically set when the received byte contains either the “Given”
address or the “Broadcast” address. The 9 bit mode requires that
the 9th information bit is a 1 to indicate that the received information
is an address and not data. Automatic address recognition is shown
in Figure 9.
The 8 bit mode is called Mode 1. In this mode the RI flag will be set
if SM2 is enabled and the information received has a valid stop bit
following the 8 address bits and the information is either a Given or
Broadcast address.
Mode 0 is the Shift Register mode and SM2 is ignored.
Using the Automatic Address Recognition feature allows a master to
selectively communicate with one or more slaves by invoking the
Given slave address or addresses. All of the slaves may be
contacted by using the Broadcast address. Two special Function
Registers are used to define the slave’s address, SADDR, and the
address mask, SADEN. SADEN is used to define which bits in the
SADDR are to b used and which bits are “don’t care”. The SADEN
mask can be logically ANDed with the SADDR to create the “Given”
address which the master will use for addressing each of the slaves.
Use of the Given address allows multiple slaves to be recognized
while excluding others. The following examples will help to show the
versatility of this scheme:
Slave 0 SADDR = 1100 0000
SADEN = 1111 1101
Given = 1100 00X0
Slave 1 SADDR = 1100 0000
SADEN = 1111 1110
Given = 1100 000X
In the above example SADDR is the same and the SADEN data is
used to differentiate between the two slaves. Slave 0 requires a 0 in
bit 0 and it ignores bit 1. Slave 1 requires a 0 in bit 1 and bit 0 is
ignored. A unique address for Slave 0 would be 1100 0010 since
slave 1 requires a 0 in bit 1. A unique address for slave 1 would be
1100 0001 since a 1 in bit 0 will exclude slave 0. Both slaves can be
selected at the same time by an address which has bit 0 = 0 (for
slave 0) and bit 1 = 0 (for slave 1). Thus, both could be addressed
with 1100 0000.
In a more complex system the following could be used to select
slaves 1 and 2 while excluding slave 0:
Slave 0 SADDR = 1100 0000
SADEN = 1111 1001
Given = 1100 0XX0
Slave 1 SADDR = 1110 0000
SADEN = 1111 1010
Given = 1110 0X0X
Slave 2 SADDR = 1110 0000
SADEN = 1111 1100
Given = 1110 00XX
In the above example the differentiation among the 3 slaves is in the
lower 3 address bits. Slave 0 requires that bit 0 = 0 and it can be
uniquely addressed by 1110 0110. Slave 1 requires that bit 1 = 0 and
it can be uniquely addressed by 1110 and 0101. Slave 2 requires
that bit 2 = 0 and its unique address is 1110 0011. To select Slaves 0
and 1 and exclude Slave 2 use address 1110 0100, since it is
necessary to make bit 2 = 1 to exclude slave 2.
The Broadcast Address for each slave is created by taking the
logical OR of SADDR and SADEN. Zeros in this result are trended
as don’t-cares. In most cases, interpreting the don’t-cares as ones,
the broadcast address will be FF hexadecimal.
Upon reset SADDR (SFR address 0A9H) and SADEN (SFR
address 0B9H) are leaded with 0s. This produces a given address
of all “don’t cares” as well as a Broadcast address of all “don’t
cares”. This effectively disables the Automatic Addressing mode and
allows the microcontroller to use standard 80C51 type UART drivers
which do not make use of this feature.
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 20
SCON Address = 98H Reset Value = 0000 0000B
SM0/FE SM1 SM2 REN TB8 RB8 Tl Rl
Bit Addressable
(SMOD0 = 0/1)*
Symbol Function
FE Framing Error bit. This bit is set by the receiver when an invalid stop bit is detected. The FE bit is not cleared by valid
frames but should be cleared by software. The SMOD0 bit must be set to enable access to the FE bit.
SM0 Serial Port Mode Bit 0, (SMOD0 must = 0 to access bit SM0)
SM1 Serial Port Mode Bit 1
SM0 SM1 Mode Description Baud Rate**
0 0 0 shift register fOSC/12
0 1 1 8-bit UART variable
1 0 2 9-bit UART fOSC/64 or fOSC/32
1 1 3 9-bit UART variable
SM2 Enables the Automatic Address Recognition feature in Modes 2 or 3. If SM2 = 1 then Rl will not be set unless the
received 9th data bit (RB8) is 1, indicating an address, and the received byte is a Given or Broadcast Address.
In Mode 1, if SM2 = 1 then Rl will not be activated unless a valid stop bit was received, and the received byte is a
Given or Broadcast Address. In Mode 0, SM2 should be 0.
REN Enables serial reception. Set by software to enable reception. Clear by software to disable reception.
TB8 The 9th data bit that will be transmitted in Modes 2 and 3. Set or clear by software as desired.
RB8 In modes 2 and 3, the 9th data bit that was received. In Mode 1, if SM2 = 0, RB8 is the stop bit that was received.
In Mode 0, RB8 is not used.
Tl T ransmit interrupt flag. Set by hardware at the end of the 8th bit time in Mode 0, or at the beginning of the stop bit in the
other modes, in any serial transmission. Must be cleared by software.
Rl Receive interrupt flag. Set by hardware at the end of the 8th bit time in Mode 0, or halfway through the stop bit time in
the other modes, in any serial reception (except see SM2). Must be cleared by software.
NOTE:
*SMOD0 is located at PCON6.
**fOSC = oscillator frequency
SU00043
Bit: 76543210
Figure 7. SCON: Serial Port Control Register
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 21
SMOD1 SMOD0 – POF GF1 GF0 PD IDL PCON
(87H)
SM0 / FE SM1 SM2 REN TB8 RB8 TI RI SCON
(98H)
D0 D1 D2 D3 D4 D5 D6 D7 D8
STOP
BIT
DATA BYTE ONLY IN
MODE 2, 3
START
BIT
SET FE BIT IF STOP BIT IS 0 (FRAMING ERROR)
SM0 TO UART MODE CONTROL
0 : SCON.7 = SM0
1 : SCON.7 = FE
SU01191
Figure 8. UART Framing Error Detection
SM0 SM1 SM2 REN TB8 RB8 TI RI SCON
(98H)
D0 D1 D2 D3 D4 D5 D6 D7 D8
1
11
0
COMPARATOR
11 X
RECEIVED ADDRESS D0 TO D7
PROGRAMMED ADDRESS
IN UART MODE 2 OR MODE 3 AND SM2 = 1:
INTERRUPT IF REN=1, RB8=1 AND “RECEIVED ADDRESS” = “PROGRAMMED ADDRESS”
– WHEN OWN ADDRESS RECEIVED, CLEAR SM2 TO RECEIVE DATA BYTES
– WHEN ALL DATA BYTES HAVE BEEN RECEIVED: SET SM2 TO WAIT FOR NEXT ADDRESS.
SU00045
Figure 9. UART Multiprocessor Communication, Automatic Address Recognition
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 22
Interrupt Priority Structure
The 8XC51FA/FB/FC and 8XC51RA+/RB+/RC+/RD+ have a
7-source four-level interrupt structure (see Table 8). The
80C52/54/58 and 80C32 only have a 6-source four-level interrupt
structure because these devices do not have a PCA.
There are 3 SFRs associated with the four-level interrupt. They are
the IE, IP, and IPH. (See Figures 10, 11, and 12.) The IPH (Interrupt
Priority High) register makes the four-level interrupt structure
possible. The IPH is located at SFR address B7H. The structure of
the IPH register and a description of its bits is shown in Figure 12.
The function of the IPH SFR is simple and when combined with the
IP SFR determines the priority of each interrupt. The priority of each
interrupt is determined as shown in the following table:
PRIORITY BITS
INTERRUPT PRIORITY LEVEL
IPH.x IP.x
INTERRUPT
PRIORITY
LEVEL
0 0 Level 0 (lowest priority)
0 1 Level 1
1 0 Level 2
1 1 Level 3 (highest priority)
The priority scheme for servicing the interrupts is the same as that
for the 80C51, except there are four interrupt levels rather than two
as on the 80C51. An interrupt will be serviced as long as an interrupt
of equal or higher priority is not already being serviced. If an
interrupt of equal or higher level priority is being serviced, the new
interrupt will wait until it is finished before being serviced. If a lower
priority level interrupt is being serviced, it will be stopped and the
new interrupt serviced. When the new interrupt is finished, the lower
priority level interrupt that was stopped will be completed.
Table 8. Interrupt Table
SOURCE POLLING PRIORITY REQUEST BITS HARDWARE CLEAR? VECTOR ADDRESS
X0 1 IE0 N (L)1Y (T)203H
T0 2 TF0 Y 0B
X1 3 IE1 N (L) Y (T) 13
T1 4 TF1 Y 1B
PCA 5 CF, CCFn
n = 0–4 N 33
SP 6 RI, TI N 23
T2 7 TF2, EXF2 N 2B
NOTES:
1. L = Level activated
2. T = T ransition activated
EX0IE (0A8H)
Enable Bit = 1 enables the interrupt.
Enable Bit = 0 disables it.
BIT SYMBOL FUNCTION
IE.7 EA Global disable bit. If EA = 0, all interrupts are disabled. If EA = 1, each interrupt can be individually
enabled or disabled by setting or clearing its enable bit.
IE.6 EC PCA interrupt enable bit for FX and RX+ only – otherwise it is not implemented.
IE.5 ET2 Timer 2 interrupt enable bit.
IE.4 ES Serial Port interrupt enable bit.
IE.3 ET1 Timer 1 interrupt enable bit.
IE.2 EX1 External interrupt 1 enable bit.
IE.1 ET0 Timer 0 interrupt enable bit.
IE.0 EX0 External interrupt 0 enable bit.
SU00840
ET0EX1ET1ESET2ECEA
01234567
Figure 10. IE Registers
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 23
PX0IP (0B8H)
Priority Bit = 1 assigns high priority
Priority Bit = 0 assigns low priority
BIT SYMBOL FUNCTION
IP.7 — Not implemented, reserved for future use.
IP.6 PPC PCA interrupt priority bit for FX and RX+ only, otherwise it is not implemented.
IP.5 PT2 Timer 2 interrupt priority bit.
IP.4 PS Serial Port interrupt priority bit.
IP.3 PT1 Timer 1 interrupt priority bit.
IP.2 PX1 External interrupt 1 priority bit.
IP.1 PT0 Timer 0 interrupt priority bit.
IP.0 PX0 External interrupt 0 priority bit.
SU00841
PT0PX1PT1PSPT2PPC—
01234567
Figure 11. IP Registers
PX0HIPH (B7H)
Priority Bit = 1 assigns higher priority
Priority Bit = 0 assigns lower priority
BIT SYMBOL FUNCTION
IPH.7 — Not implemented, reserved for future use.
IPH.6 PPCH PCA interrupt priority bit high for FX and RX+ only, otherwise it is not implemented.
IPH.5 PT2H Timer 2 interrupt priority bit high.
IPH.4 PSH Serial Port interrupt priority bit high.
IPH.3 PT1H Timer 1 interrupt priority bit high.
IPH.2 PX1H External interrupt 1 priority bit high.
IPH.1 PT0H Timer 0 interrupt priority bit high.
IPH.0 PX0H External interrupt 0 priority bit high.
SU00881
PT0HPX1HPT1HPSHPT2HPPCH—
01234567
Figure 12. IPH Registers
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 24
Reduced EMI Mode
The AO bit (AUXR.0) in the AUXR register when set disables the
ALE output.
Reduced EMI Mode
AUXR (8EH)
765432 1 0
– – – – – – EXTRAM AO
AUXR.1 EXTRAM (RX+ only)
AUX R.0 AO T urns off ALE output.
Dual DPTR
The dual DPTR structure (see Figure 13) is a way by which the chip
will specify the address of an external data memory location. There
are two 16-bit DPTR registers that address the external memory,
and a single bit called DPS = AUXR1/bit0 that allows the program
code to switch between them.
•New Register Name: AUXR1#
•SFR Address: A2H
•Reset Value: xxxx00x0B
76543210
– – – LPEP GF3 0 – DPS
Where:
DPS = AUXR1/bit0 = Switches between DPTR0 and DPTR1.
Select Reg DPS
DPTR0 0
DPTR1 1
The DPS bit status should be saved by software when switching
between DPTR0 and DPTR1.
The GF3 bit is a general purpose user–defined flag. Note that bit 2 is
not writable and is always read as a zero. This allows the DPS bit to
be quickly toggled simply by executing an INC DPTR instruction
without af fecting the GF3 or LPEP bits.
DPS
DPTR1
DPTR0
DPH
(83H) DPL
(82H) EXTERNAL
DATA
MEMORY
SU00745A
BIT0
AUXR1
Figure 13.
DPTR Instructions
The instructions that refer to DPTR refer to the data pointer that is
currently selected using the AUXR1/bit 0 register. The six
instructions that use the DPTR are as follows:
INC DPTR Increments the data pointer by 1
MOV DPTR, #data16 Loads the DPTR with a 16-bit constant
MOV A, @ A+DPTR Move code byte relative to DPTR to ACC
MOVX A, @ DPTR Move external RAM (16-bit address) to
ACC
MOVX @ DPTR , A Move ACC to external RAM (16-bit
address)
JMP @ A + DPTR Jump indirect relative to DPTR
The data pointer can be accessed on a byte-by-byte basis by
specifying the low or high byte in an instruction which accesses the
SFRs. See application note AN458 for more details.
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 25
(8XC51FX and 8XC51RX+ ONLY)
Programmable Counter Array (PCA)
(8XC51FX and 8XC51RX+ only)
The Programmable Counter Array available on the 8XC51FX and
8XC51RX+ is a special 16-bit T imer that has five 16-bit
capture/compare modules associated with it. Each of the modules
can be programmed to operate in one of four modes: rising and/or
falling edge capture, software timer, high-speed output, or pulse
width modulator. Each module has a pin associated with it in port 1.
Module 0 is connected to P1.3(CEX0), module 1 to P1.4(CEX1), etc.
The basic PCA configuration is shown in Figure 14.
The PCA timer is a common time base for all five modules and can
be programmed to run at: 1/12 the oscillator frequency, 1/4 the
oscillator frequency, the Timer 0 overflow, or the input on the ECI pin
(P1.2). The timer count source is determined from the CPS1 and
CPS0 bits in the CMOD SFR as follows (see Figure 17):
CPS1 CPS0 PCA Timer Count Source
0 0 1/12 oscillator frequency
0 1 1/4 oscillator frequency
1 0 Timer 0 overflow
1 1 External Input at ECI pin
In the CMOD SFR are three additional bits associated with the PCA.
They are CIDL which allows the PCA to stop during idle mode,
WDTE which enables or disables the watchdog function on
module 4, and ECF which when set causes an interrupt and the
PCA overflow flag CF (in the CCON SFR) to be set when the PCA
timer overflows. These functions are shown in Figure 15.
The watchdog timer function is implemented in module 4 (see
Figure 24).
The CCON SFR contains the run control bit for the PCA and the
flags for the PCA timer (CF) and each module (refer to Figure 18).
To run the PCA the CR bit (CCON.6) must be set by software. The
PCA is shut off by clearing this bit. The CF bit (CCON.7) is set when
the PCA counter overflows and an interrupt will be generated if the
ECF bit in the CMOD register is set, The CF bit can only be cleared
by software. Bits 0 through 4 of the CCON register are the flags for
the modules (bit 0 for module 0, bit 1 for module 1, etc.) and are set
by hardware when either a match or a capture occurs. These flags
also can only be cleared by software. The PCA interrupt system
shown in Figure 16.
Each module in the PCA has a special function register associated
with it. These registers are: CCAPM0 for module 0, CCAPM1 for
module 1, etc. (see Figure 19). The registers contain the bits that
control the mode that each module will operate in. The ECCF bit
(CCAPMn.0 where n=0, 1, 2, 3, or 4 depending on the module)
enables the CCF flag in the CCON SFR to generate an interrupt
when a match or compare occurs in the associated module. PWM
(CCAPMn.1) enables the pulse width modulation mode. The TOG
bit (CCAPMn.2) when set causes the CEX output associated with
the module to toggle when there is a match between the PCA
counter and the module’s capture/compare register. The match bit
MAT (CCAPMn.3) when set will cause the CCFn bit in the CCON
register to be set when there is a match between the PCA counter
and the module’s capture/compare register.
The next two bits CAPN (CCAPMn.4) and CAPP (CCAPMn.5)
determine the edge that a capture input will be active on. The CAPN
bit enables the negative edge, and the CAPP bit enables the
positive edge. If both bits are set both edges will be enabled and a
capture will occur for either transition. The last bit in the register
ECOM (CCAPMn.6) when set enables the comparator function.
Figure 20 shows the CCAPMn settings for the various PCA
functions.
There are two additional registers associated with each of the PCA
modules. They are CCAPnH and CCAPnL and these are the
registers that store the 16-bit count when a capture occurs or a
compare should occur. When a module is used in the PWM mode
these registers are used to control the duty cycle of the output.
MODULE FUNCTIONS:
16-BIT CAPTURE
16-BIT TIMER
16-BIT HIGH SPEED OUTPUT
8-BIT PWM
WATCHDOG TIMER (MODULE 4 ONLY)
MODULE 0
MODULE 1
MODULE 2
MODULE 3
MODULE 4
P1.3/CEX0
P1.4/CEX1
P1.5/CEX2
P1.6/CEX3
P1.7/CEX4
16 BITS
PCA TIMER/COUNTER
TIME BASE FOR PCA MODULES
16 BITS
SU00032
Figure 14. Programmable Counter Array (PCA)
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 26
(8XC51FX and 8XC51RX+ ONLY)
CF CR CCF4 CCF3 CCF2 CCF1 CCF0–– CCON
(D8H)
CH CL
OVERFLOW INTERRUPT
16–BIT UP COUNTER
IDLE
TO PCA
MODULES
CMOD
(D9H)
CIDL WDTE –– –– –– CPS1 CPS0 ECF
OSC/12
OSC/4
TIMER 0
OVERFLOW
EXTERNAL INPUT
(P1.2/ECI)
DECODE
00
01
10
11
SU00033
Figure 15. PCA Timer/Counter
MODULE 0
MODULE 1
MODULE 2
MODULE 3
MODULE 4
PCA TIMER/COUNTER
CF CR CCF4 CCF3 CCF2 CCF1 CCF0––
CMOD.0 ECF CCAPMn.0 ECCFn
TO
INTERRUPT
PRIORITY
DECODER
CCON
(D8H)
IE.6
EC IE.7
EA
SU00034
Figure 16. PCA Interrupt System
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 27
(8XC51FX and 8XC51RX+ ONLY)
CMOD Address = OD9H Reset Value = 00XX X000B
CIDL WDTE – – – CPS1 CPS0 ECF
Bit:
Symbol Function
CIDL Counter Idle control: CIDL = 0 programs the PCA Counter to continue functioning during idle Mode. CIDL = 1 programs
it to be gated off during idle.
WDTE W atchdog Timer Enable: WDTE = 0 disables Watchdog Timer function on PCA Module 4. WDTE = 1 enables it.
– Not implemented, reserved for future use.*
CPS1 PCA Count Pulse Select bit 1.
CPS0 PCA Count Pulse Select bit 0.
CPS1 CPS0 Selected PCA Input**
0 0 0 Internal clock, fOSC ÷ 12
0 1 1 Internal clock, fOSC ÷ 4
1 0 2 T imer 0 overflow
1 1 3 External clock at ECI/P1.2 pin (max. rate = fOSC ÷8)
ECF PCA Enable Counter Overflow interrupt: ECF = 1 enables CF bit in CCON to generate an interrupt. ECF = 0 disables
that function of CF.
NOTE:
* User software should not write 1s to reserved bits. These bits may be used in future 8051 family products to invoke new features. In that case, the reset or inactive value of the
new bit will be 0, and its active value will be 1. The value read from a reserved bit is indeterminate.
** fOSC = oscillator frequency
SU00035
76543210
Figure 17. CMOD: PCA Counter Mode Register
CCON Address = OD8H Reset Value = 00X0 0000B
CF CR – CCF4 CCF3 CCF2 CCF1 CCF0
Bit Addressable
Bit:
Symbol Function
CF PCA Counter Overflow flag. Set by hardware when the counter rolls over. CF flags an interrupt if bit ECF in CMOD is
set. CF may be set by either hardware or software but can only be cleared by software.
CR PCA Counter Run control bit. Set by software to turn the PCA counter on. Must be cleared by software to turn the PCA
counter off.
– Not implemented, reserved for future use*.
CCF4 PCA Module 4 interrupt flag. Set by hardware when a match or capture occurs. Must be cleared by software.
CCF3 PCA Module 3 interrupt flag. Set by hardware when a match or capture occurs. Must be cleared by software.
CCF2 PCA Module 2 interrupt flag. Set by hardware when a match or capture occurs. Must be cleared by software.
CCF1 PCA Module 1 interrupt flag. Set by hardware when a match or capture occurs. Must be cleared by software.
CCF0 PCA Module 0 interrupt flag. Set by hardware when a match or capture occurs. Must be cleared by software.
NOTE:
* User software should not write 1s to reserved bits. These bits may be used in future 8051 family products to invoke new features. In that case, the reset or inactive value of the
new bit will be 0, and its active value will be 1. The value read from a reserved bit is indeterminate.
SU00036
76543210
Figure 18. CCON: PCA Counter Control Register
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 28
(8XC51FX and 8XC51RX+ ONLY)
CCAPMn Address CCAPM0 0DAH
CCAPM1 0DBH
CCAPM2 0DCH
CCAPM3 0DDH
CCAPM4 0DEH
Reset Value = X000 0000B
– ECOMn CAPPn CAPNn MATn TOGn PWMn ECCFn
Not Bit Addressable
Bit:
Symbol Function
–Not implemented, reserved for future use*.
ECOMn Enable Comparator. ECOMn = 1 enables the comparator function.
CAPPn Capture Positive, CAPPn = 1 enables positive edge capture.
CAPNn Capture Negative, CAPNn = 1 enables negative edge capture.
MATn Match. When MATn = 1, a match of the PCA counter with this module’s compare/capture register causes the CCFn bit
in CCON to be set, flagging an interrupt.
TOGn Toggle. When TOGn = 1, a match of the PCA counter with this module’s compare/capture register causes the CEXn
pin to toggle.
PWMn Pulse Width Modulation Mode. PWMn = 1 enables the CEXn pin to be used as a pulse width modulated output.
ECCFn Enable CCF interrupt. Enables compare/capture flag CCFn in the CCON register to generate an interrupt.
NOTE:
*User software should not write 1s to reserved bits. These bits may be used in future 8051 family products to invoke new features. In that case, the reset or inactive value of the new
bit will be 0, and its active value will be 1. The value read from a reserved bit is indeterminate.
SU00037
76543210
Figure 19. CCAPMn: PCA Modules Compare/Capture Registers
–ECOMn CAPPn CAPNn MATn TOGn PWMn ECCFn MODULE FUNCTION
X 0 0 0 0 0 0 0 No operation
X X 1 0 0 0 0 X 16-bit capture by a positive-edge trigger on CEXn
X X 0 1 0 0 0 X 16-bit capture by a negative trigger on CEXn
X X 1 1 0 0 0 X 16-bit capture by a transition on CEXn
X 1 0 0 1 0 0 X 16-bit Software T imer
X 1 0 0 1 1 0 X 16-bit High Speed Output
X 1 0 0 0 0 1 0 8-bit PWM
X 1 0 0 1 X 0 X W atchdog Timer
Figure 20. PCA Module Modes (CCAPMn Register)
PCA Capture Mode
To use one of the PCA modules in the capture mode either one or
both of the CCAPM bits CAPN and CAPP for that module must be
set. The external CEX input for the module (on port 1) is sampled for
a transition. When a valid transition occurs the PCA hardware loads
the value of the PCA counter registers (CH and CL) into the
module’s capture registers (CCAPnL and CCAPnH). If the CCFn bit
for the module in the CCON SFR and the ECCFn bit in the CCAPMn
SFR are set then an interrupt will be generated. Refer to Figure 21.
16-bit Software Timer Mode
The PCA modules can be used as software timers by setting both
the ECOM and MAT bits in the modules CCAPMn register. The PCA
timer will be compared to the module’s capture registers and when a
match occurs an interrupt will occur if the CCFn (CCON SFR) and
the ECCFn (CCAPMn SFR) bits for the module are both set (see
Figure 22).
High Speed Output Mode
In this mode the CEX output (on port 1) associated with the PCA
module will toggle each time a match occurs between the PCA
counter and the module’s capture registers. To activate this mode
the TOG, MAT, and ECOM bits in the module’s CCAPMn SFR must
be set (see Figure 23).
Pulse Width Modulator Mode
All of the PCA modules can be used as PWM outputs. Figure 24
shows the PWM function. The frequency of the output depends on
the source for the PCA timer. All of the modules will have the same
frequency of output because they all share the PCA timer. The duty
cycle of each module is independently variable using the module’s
capture register CCAPLn. When the value of the PCA CL SFR is
less than the value in the module’s CCAPLn SFR the output will be
low, when it is equal to or greater than the output will be high. When
CL overflows from FF to 00, CCAPLn is reloaded with the value in
CCAPHn. the allows updating the PWM without glitches. The PWM
and ECOM bits in the module’s CCAPMn register must be set to
enable the PWM mode.
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 29
(8XC51FX and 8XC51RX+ ONLY)
CF CR CCF4 CCF3 CCF2 CCF1 CCF0–– CCON
(D8H)
–– ECOMn CAPPn CAPNn MATn TOGn PWMn ECCFn CCAPMn, n= 0 to 4
(DAH – DEH)
CH CL
CCAPnH CCAPnL
CEXn CAPTURE
PCA INTERRUPT
PCA TIMER/COUNTER
0000
(TO CCFn)
SU00749
Figure 21. PCA Capture Mode
MATCH
CF CR CCF4 CCF3 CCF2 CCF1 CCF0–– CCON
(D8H)
–– ECOMn CAPPn CAPNn MATn TOGn PWMn ECCFn CCAPMn, n= 0 to 4
(DAH – DEH)
CH CL
CCAPnH CCAPnL PCA INTERRUPT
PCA TIMER/COUNTER
0000
16–BIT COMPARATOR
(TO CCFn)
ENABLE
WRITE TO
CCAPnH RESET
WRITE TO
CCAPnL
01
SU00750
Figure 22. PCA Compare Mode
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 30
(8XC51FX and 8XC51RX+ ONLY)
CF CR CCF4 CCF3 CCF2 CCF1 CCF0–– CCON
(D8H)
–– ECOMn CAPPn CAPNn MATn TOGn PWMn ECCFn CCAPMn, n: 0..4
(DAH – DEH)
CH CL
CCAPnH CCAPnL PCA INTERRUPT
PCA TIMER/COUNTER
1000
16–BIT COMPARATOR
(TO CCFn)
WRITE TO
CCAPnH RESET
WRITE TO
CCAPnL
01
ENABLE
CEXn
TOGGLE
MATCH
SU00751
Figure 23. PCA High Speed Output Mode
CL < CCAPnL
–– ECOMn CAPPn CAPNn MATn TOGn PWMn ECCFn CCAPMn, n: 0..4
(DAH – DEH)
PCA TIMER/COUNTER
0000
CL
CCAPnL
CEXn
8–BIT
COMPARATOR
OVERFLOW
CCAPnH
ENABLE
0
1
CL >= CCAPnL
0
SU00752
Figure 24. PCA PWM Mode
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 31
(8XC51FX and 8XC51RX+ ONLY)
–– ECOMn CAPPn CAPNn MATn TOGn PWMn ECCFn CCAPM4
(DEH)
CH CL
CCAP4H CCAP4L
RESET
PCA TIMER/COUNTER
X000
16–BIT COMPARATOR MATCH
ENABLE
WRITE TO
CCAP4H RESET
WRITE TO
CCAP4L
01
1
CMOD
(D9H)
CIDL WDTE –– –– –– CPS1 CPS0 ECF
X
SU00832
MODULE 4
Figure 25. PCA Watchdog Timer m(Module 4 only)
PCA Watchdog Timer
An on-board watchdog timer is available with the PCA to improve
the reliability of the system without increasing chip count. W atchdog
timers are useful for systems that are susceptible to noise, power
glitches, or electrostatic discharge. Module 4 is the only PCA
module that can be programmed as a watchdog. However, this
module can still be used for other modes if the watchdog is not
needed.
Figure 25 shows a diagram of how the watchdog works. The user
pre-loads a 16-bit value in the compare registers. Just like the other
compare modes, this 16-bit value is compared to the PCA timer
value. If a match is allowed to occur, an internal reset will be
generated. This will not cause the RST pin to be driven high.
In order to hold off the reset, the user has three options:
1. periodically change the compare value so it will never match the
PCA timer,
2. periodically change the PCA timer value so it will never match
the compare values, or
3. disable the watchdog by clearing the WDTE bit before a match
occurs and then re-enable it.
The first two options are more reliable because the watchdog timer
is never disabled as in option #3. If the program counter ever goes
astray, a match will eventually occur and cause an internal reset.
The second option is also not recommended if other PCA modules
are being used. Remember, the PCA timer is the time base for all
modules; changing the time base for other modules would not be a
good idea. Thus, in most applications the first solution is the best
option.
Figure 26 shows the code for initializing the watchdog timer.
Module 4 can be configured in either compare mode, and the WDTE
bit in CMOD must also be set. The user’s software then must
periodically change (CCAP4H,CCAP4L) to keep a match from
occurring with the PCA timer (CH,CL). This code is given in the
W ATCHDOG routine in Figure 26.
This routine should not be part of an interrupt service routine,
because if the program counter goes astray and gets stuck in an
infinite loop, interrupts will still be serviced and the watchdog will
keep getting reset. Thus, the purpose of the watchdog would be
defeated. Instead, call this subroutine from the main program within
216 count of the PCA timer.
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 32
(8XC51FX and 8XC51RX+ ONLY)
INIT_WATCHDOG:
MOV CCAPM4, #4CH ; Module 4 in compare mode
MOV CCAP4L, #0FFH ; Write to low byte first
MOV CCAP4H, #0FFH ; Before PCA timer counts up to
; FFFF Hex, these compare values
; must be changed
ORL CMOD, #40H ; Set the WDTE bit to enable the
; watchdog timer without changing
; the other bits in CMOD
;
;********************************************************************
;
; Main program goes here, but CALL WATCHDOG periodically.
;
;********************************************************************
;
WATCHDOG:
CLR EA ; Hold off interrupts
MOV CCAP4L, #00 ; Next compare value is within
MOV CCAP4H, CH ; 255 counts of the current PCA
SETB EA ; timer value
RET
Figure 26. PCA Watchdog T imer Initialization Code
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 33
(8XC51RX+ ONLY)
Expanded Data RAM Addressing
(8XC51RX+ ONLY)
The 8XC51RX+ have internal data memory that is mapped into four
separate segments: the lower 128 bytes of RAM, upper 128 bytes of
RAM, 128 bytes S pecial F unctio n Reg ister (SFR), and 256 bytes
(768 for RD+) expanded RAM (EXTRAM).
The four segments are:
1. The Lower 128 bytes of RAM (addresses 00H to 7FH) are
directly and indirectly addressable.
2. The Upper 128 bytes of RAM (addresses 80H to FFH) are
indirectly addressable only.
3. The Special Function Registers, SFRs, (addresses 80H to FFH)
are directly addressable only.
4. The 256-bytes (768 for RD+) expanded RAM ((EXTRAM
(256-bytes) 00H–FFH)) and ((EXTRAM (768-bytes for RD+)
00H – 2FFH)) are indirectly accessed by move external instruction,
MOVX, and with the EXTRAM bit cleared, see Figure 27.
The Lower 128 bytes can be accessed by either direct or indirect
addressing. The Upper 128 bytes can be accessed by indirect
addressing only. The Upper 128 bytes occupy the same address
space as the SFR. That means they have the same address, but are
physically separate from SFR space.
When an instruction accesses an internal location above address
7FH, the CPU knows whether the access is to the upper 128 bytes
of data RAM or to SFR space by the addressing mode used in the
instruction. Instructions that use direct addressing access SFR
space. For example:
MOV 0A0H,#data
accesses the SFR at location 0A0H (which is P2). Instructions that
use indirect addressing access the Upper 128 bytes of data RAM.
For example:
MOV @R0,#data
where R0 contains 0A0H, accesses the data byte at address 0A0H,
rather than P2 (whose address is 0A0H).
The EXTRAM can be accessed by indirect addressing, with
EXTRAM bit cleared and MOVX instructions. This part of memory is
physically located on-chip, logically occupies the first 256-bytes (768
for RD+) of external data memory.
With EXTRAM = 0, the EXTRAM is indirectly addressed, using the
MOVX instruction in combination with any of the registers R0, R1 of
the selected bank or DPTR. An access to EXTRAM will not affect
ports P0, P3.6 (WR#) and P3.7 (RD#). P2 SFR is output during
external addressing. For example, with EXTRAM = 0,
MOVX @R0,#data
where R0 contains 0A0H, access the EXTRAM at address 0A0H
rather than external memory. An access to external data memory
locations higher than FFH (2FF for RD+) (i.e., 0100H to FFFFH) will
be performed with the MOVX DPTR instructions in the same way as
in the standard 80C51, so with P0 and P2 as data/address bus, and
P3.6 and P3.7 as write and read timing signals. Refer to Figure 28.
With EXTRAM = 1, MOVX @Ri and MOVX @DPTR will be similar
to the standard 80C51. MOVX @ Ri will provide an 8-bit address
multiplexed with data on Port 0 and any output port pins can be
used to output higher order address bits. This is to provide the
external paging capability. MOVX @DPTR will generate a 16-bit
address. Port 2 outputs the high-order eight address bits (the
contents of DPH) while Port 0 multiplexes the low-order eight
address bits (DPL) with data. MOVX @Ri and MOVX @DPTR will
generate either read or write signals on P3.6 (#WR) and P3.7 (#RD).
The stack pointer (SP) may be located anywhere in the 256 bytes
RAM (lower and upper RAM) internal data memory. The stack may
not be located in the EXTRAM.
AUXR Reset Value = xxxx xx00B
——————EXTRAM AO
Not Bit Addressable
Bit:
Symbol Function
AO Disable/Enable ALE
AO Operating Mode
0 ALE is emitted at a constant rate of 1/6 the oscillator frequency.
1 ALE is active only during a MOVX or MOVC instruction.
EXTRAM Internal/External RAM access using MOVX @Ri/@DPTR
EXTRAM Operating Mode
0 Internal ERAM (00H–FFH) (00H–2FFH for RD+) access using MOVX @Ri/@DPTR
1 External data memory access.
— Not implemented, reserved for future use*.
NOTE:
*User software should not write 1s to reserved bits. These bits may be used in future 8051 family products to invoke new features. In that case, the reset or inactive value of the new
bit will be 0, and its active value will be 1. The value read from a reserved bit is indeterminate.
SU01003
76543210
Address = 8EH
Figure 27. AUXR: Auxiliary Register (RX+ only)
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 34
(8XC51RX+ ONLY)
ERAM
256 BYTES
UPPER
128 BYTES
INTERNAL RAM
LOWER
128 BYTES
INTERNAL RAM
SPECIAL
FUNCTION
REGISTER
ÉÉÉÉÉ
ÉÉÉÉÉ
ÉÉÉÉÉ
ÉÉÉÉÉ
ÉÉÉÉÉ
2FF
(RD TO RD+)
FF
00
FF
00
FF
00
80 80
EXTERNAL
DATA
MEMORY
FFFF
0000
0100 300 (RD+ only)
SU00834
Figure 28. Internal and External Data Memory Address Space with EXTRAM = 0
HARDWARE WATCHDOG TIMER (ONE-TIME
ENABLED WITH RESET-OUT FOR 89C51RC+/RD+)
The WDT is intended as a recovery method in situations where the
CPU may be subjected to software upset. The WDT consists of a
14-bit counter and the W atchDog Timer reset (WDTRST) SFR. The
WDT is disabled at reset. To enable the WDT, user must write 01EH
and 0E1H in sequence to the WDTRST, SFR location 0A6H. When
WDT is enabled, it will increment every machine cycle while the
oscillator is running and there is no way to disable the WDT except
through reset (either hardware reset or WDT overflow reset). When
WDT overflows, it will drive an output reset HIGH pulse at the
RST-pin.
Using the WDT
To enable the WDT, user must write 01EH and 0E1H in sequence to
the WDTRST, SFR location 0A6H. When WDT is enabled, the user
needs to service it by writing to 01EH and 0E1H to WDTRST to
avoid WDT overflow. The 14-bit counter overflows when it reaches
16383 (3FFFH) and this will reset the device. When using the WDT,
a 1Kohm resistor must be inserted between RST of the device and
the Power On Reset circuitry. When WDT is enabled, it will
increment every machine cycle while the oscillator is running. This
means the user must reset the WDT at least every 16383 machine
cycles. To reset the WDT, the user must write 01EH and 0E1H to
WDTRST. WDTRST is a write only register. The WDT counter
cannot be read or written. When WDT overflows, it will generate an
output RESET pulse at the reset pin. The RESET pulse duration is
98 × TOSC, where TOSC = 1/fOSC. To make the best use of the WDT,
it should be serviced in those sections of code that will periodically
be executed within the time required to prevent a WDT reset.
In applications using the Hardware W atchdog Timer of the
P8xC51RD+, a series resistor (1K 20%) needs to be included
between the reset pin and any external components. Without this
resistor the watchdog timer will not function.
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 35
ABSOLUTE MAXIMUM RATINGS1, 2, 3
PARAMETER RATING UNIT
Operating temperature under bias 0 to +70 or –40 to +85 °C
Storage temperature range –65 to +150 °C
Voltage on EA/VPP pin to VSS 0 to +13.0 V
Voltage on any other pin to VSS –0.5 to +6.5 V
Maximum IOL per I/O pin 15 mA
Power dissipation (based on package heat transfer limitations, not device power consumption) 1.5 W
NOTES:
1. Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and
functional operation of the device at these or any conditions other than those described in the AC and DC Electrical Characteristics section
of this specification is not implied.
2. This product includes circuitry specifically designed for the protection of its internal devices from the damaging effects of excessive static
charge. Nonetheless, it is suggested that conventional precautions be taken to avoid applying greater than the rated maximum.
3. Parameters are valid over operating temperature range unless otherwise specified. All voltages are with respect to VSS unless otherwise
noted.
AC ELECTRICAL CHARACTERISTICS
Tamb = 0°C to +70°C or –40°C to +85°C
CLOCK FREQUENCY
RANGE –f
SYMBOL FIGURE PARAMETER MIN MAX UNIT
1/tCLCL 33 Oscillator frequency
Speed versions : 4:5:S (16MHz)
I:J:U (33MHz) 0
016
33 MHz
MHz
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 36
DC ELECTRICAL CHARACTERISTICS
Tamb = 0°C to +70°C or –40°C to +85°C, VCC = 2.7V to 5.5V, VSS = 0V (16MHz devices)
SYMBOL
PARAMETER
TEST LIMITS
UNIT
SYMBOL
PARAMETER
CONDITIONS MIN TYP1MAX
UNIT
V
In
p
ut low voltage
4.0V < VCC < 5.5V –0.5 0.2VCC–0.1 V
V
IL
Inp
u
t
lo
w v
oltage
2.7V<VCC< 4.0V –0.5 0.7 V
VIH Input high voltage (ports 0, 1, 2, 3, EA) 0.2VCC+0.9 VCC+0.5 V
VIH1 Input high voltage, XTAL1, RST 0.7VCC VCC+0.5 V
VOL Output low voltage, ports 1, 2 8VCC = 2.7V
IOL = 1.6mA20.4 V
VOL1 Output low voltage, port 0, ALE, PSEN8, 7VCC = 2.7V
IOL = 3.2mA20.4 V
VO
Out
p
ut high voltage
p
orts 1 2 3 3
VCC = 2.7V
IOH = –20µAVCC – 0.7 V
V
OH
O
u
tp
u
t
high
v
oltage
,
ports
1
,
2
,
33
VCC = 4.5V
IOH = –30µAVCC – 0.7 V
VOH1 Output high voltage (port 0 in external bus mode),
ALE9, PSEN3VCC = 2.7V
IOH = –3.2mA VCC – 0.7 V
IIL Logical 0 input current, ports 1, 2, 3 VIN = 0.4V –1 –50 µA
ITL Logical 1-to-0 transition current, ports 1, 2, 36VIN = 2.0V
See note 4 –650 µA
ILI Input leakage current, port 0 0.45 < VIN < VCC – 0.3 ±10 µA
ICC Power supply current (see Figure 36): See note 5
Active mode @ 16MHz (all except 8XC51RD+)
87C51RD+ 15
16 mA
mA
Idle mode @ 16MHz 4 mA
Power-down mode or clock stopped (see Figure 40
f diti )
Tamb = 0°C to 70°C 3 50 µA
for conditions) Tamb = –40°C to +85°C 75 µA
RRST Internal reset pull-down resistor 40 225 kΩ
CIO Pin capacitance10 (except EA) 15 pF
NOTES:
1. Typical ratings are not guaranteed. The values listed are at room temperature, 5V.
2. Capacitive loading on ports 0 and 2 may cause spurious noise to be superimposed on the VOLs of ALE and ports 1 and 3. The noise is due
to external bus capacitance discharging into the port 0 and port 2 pins when these pins make 1-to-0 transitions during bus operations. In the
worst cases (capacitive loading > 100pF), the noise pulse on the ALE pin may exceed 0.8V. In such cases, it may be desirable to qualify
ALE with a Schmitt T rigger, or use an address latch with a Schmitt Trigger STROBE input. IOL can exceed these conditions provided that no
single output sinks more than 5mA and no more than two outputs exceed the test conditions.
3. Capacitive loading on ports 0 and 2 may cause the VOH on ALE and PSEN to momentarily fall below the VCC–0.7 specification when the
address bits are stabilizing.
4. Pins of ports 1, 2 and 3 source a transition current when they are being externally driven from 1 to 0. The transition current reaches its
maximum value when VIN is approximately 2V.
5. See Figures 37 through 40 for ICC test conditions, and Figure 36 for ICC vs Freq.
Active mode: ICC = (0.9 × FREQ. + 1.1)mA for all devices except 8XC51RD+; 8XC51RD+ ICC = (0.9 x Freq +2.1) mA
Idle mode: ICC = (0.18 × FREQ. +1.01)mA
6. This value applies to Tamb = 0°C to +70°C. For Tamb = –40°C to +85°C, ITL = –750µA.
7. Load capacitance for port 0, ALE, and PSEN = 100pF, load capacitance for all other outputs = 80pF.
8. Under steady state (non-transient) conditions, IOL must be externally limited as follows:
Maximum IOL per port pin: 15mA (*NOTE: This is 85°C specification.)
Maximum IOL per 8-bit port: 26mA
Maximum total IOL for all outputs: 71mA
If IOL exceeds the test condition, VOL may exceed the related specification. Pins are not guaranteed to sink current greater than the listed
test conditions.
9. ALE is tested to VOH1, except when ALE is off then VOH is the voltage specification.
10.Pin capacitance is characterized but not tested. Pin capacitance is less than 25pF. Pin capacitance of ceramic package is less than 15pF
(except EA is 25pF).
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 37
DC ELECTRICAL CHARACTERISTICS
Tamb = 0°C to +70°C or –40°C to +85°C, 33MHz devices; 5V ±10%; VSS = 0V
SYMBOL
PARAMETER
TEST LIMITS
UNIT
SYMBOL
PARAMETER
CONDITIONS MIN TYP1MAX
UNIT
VIL Input low voltage 4.5V < VCC < 5.5V –0.5 0.2VCC–0.1 V
VIH Input high voltage (ports 0, 1, 2, 3, EA) 0.2VCC+0.9 VCC+0.5 V
VIH1 Input high voltage, XTAL1, RST 0.7VCC VCC+0.5 V
VOL Output low voltage, ports 1, 2, 3 8VCC = 4.5V
IOL = 1.6mA20.4 V
VOL1 Output low voltage, port 0, ALE, PSEN 7, 8VCC = 4.5V
IOL = 3.2mA20.4 V
VOH Output high voltage, ports 1, 2, 3 3VCC = 4.5V
IOH = –30µAVCC – 0.7 V
VOH1 Output high voltage (port 0 in external bus mode),
ALE9, PSEN3VCC = 4.5V
IOH = –3.2mA VCC – 0.7 V
IIL Logical 0 input current, ports 1, 2, 3 VIN = 0.4V –1 –50 µA
ITL Logical 1-to-0 transition current, ports 1, 2, 36VIN = 2.0V
See note 4 –650 µA
ILI Input leakage current, port 0 0.45 < VIN < VCC – 0.3 ±10 µA
ICC Power supply current (see Figure 36): See note 5
Active mode (see Note 5)
Idle mode (see Note 5)
Power-down mode or clock stopped
( Fi 40 f diti )
Tamb = 0°C to 70°C 3 50 µA
(see Figure 40 for conditions) Tamb = –40°C to +85°C 75 µA
RRST Internal reset pull-down resistor 40 225 kΩ
CIO Pin capacitance10 (except EA) 15 pF
NOTES:
1. Typical ratings are not guaranteed. The values listed are at room temperature, 5V.
2. Capacitive loading on ports 0 and 2 may cause spurious noise to be superimposed on the VOLs of ALE and ports 1 and 3. The noise is due
to external bus capacitance discharging into the port 0 and port 2 pins when these pins make 1-to-0 transitions during bus operations. In the
worst cases (capacitive loading > 100pF), the noise pulse on the ALE pin may exceed 0.8V. In such cases, it may be desirable to qualify
ALE with a Schmitt T rigger, or use an address latch with a Schmitt Trigger STROBE input. IOL can exceed these conditions provided that no
single output sinks more than 5mA and no more than two outputs exceed the test conditions.
3. Capacitive loading on ports 0 and 2 may cause the VOH on ALE and PSEN to momentarily fall below the VCC–0.7 specification when the
address bits are stabilizing.
4. Pins of ports 1, 2 and 3 source a transition current when they are being externally driven from 1 to 0. The transition current reaches its
maximum value when VIN is approximately 2V.
5. See Figures 37 through 40 for ICC test conditions and Figure 36 for ICC vs Freq.
Active mode: ICC(MAX) = (0.9 × FREQ. + 1.1)mA. for all devices except 8XC51RD+; 8XC51RD+ ICC = (0.9 x Freq +2.1) mA
Idle mode: ICC(MAX) = (0.18 × FREQ. +1.0)mA
6. This value applies to Tamb = 0°C to +70°C. For Tamb = –40°C to +85°C, ITL = –750µA.
7. Load capacitance for port 0, ALE, and PSEN = 100pF, load capacitance for all other outputs = 80pF.
8. Under steady state (non-transient) conditions, IOL must be externally limited as follows:
Maximum IOL per port pin: 15mA (*NOTE: This is 85°C specification.)
Maximum IOL per 8-bit port: 26mA
Maximum total IOL for all outputs: 71mA
If IOL exceeds the test condition, VOL may exceed the related specification. Pins are not guaranteed to sink current greater than the listed
test conditions.
9. ALE is tested to VOH1, except when ALE is off then VOH is the voltage specification.
10.Pin capacitance is characterized but not tested. Pin capacitance is less than 25pF. Pin capacitance of ceramic package is less than 15pF
(except EA is 25pF).
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 38
AC ELECTRICAL CHARACTERISTICS
Tamb = 0°C to +70°C or –40°C to +85°C, VCC = +2.7V to +5.5V, VSS = 0V1, 2, 3
16MHz CLOCK VARIABLE CLOCK
SYMBOL FIGURE PARAMETER MIN MAX MIN MAX UNIT
1/tCLCL 29 Oscillator frequency5
Speed versions : 4; 5;S 3.5 16 MHz
tLHLL 29 ALE pulse width 85 2tCLCL–40 ns
tAVLL 29 Address valid to ALE low 22 tCLCL–40 ns
tLLAX 29 Address hold after ALE low 32 tCLCL–30 ns
tLLIV 29 ALE low to valid instruction in 150 4tCLCL–100 ns
tLLPL 29 ALE low to PSEN low 32 tCLCL–30 ns
tPLPH 29 PSEN pulse width 142 3tCLCL–45 ns
tPLIV 29 PSEN low to valid instruction in 82 3tCLCL–105 ns
tPXIX 29 Input instruction hold after PSEN 0 0 ns
tPXIZ 29 Input instruction float after PSEN 37 tCLCL–25 ns
tAVIV 529 Address to valid instruction in 207 5tCLCL–105 ns
tPLAZ 29 PSEN low to address float 10 10 ns
Data Memory
tRLRH 30, 31 RD pulse width 275 6tCLCL–100 ns
tWLWH 30, 31 WR pulse width 275 6tCLCL–100 ns
tRLDV 30, 31 RD low to valid data in 147 5tCLCL–165 ns
tRHDX 30, 31 Data hold after RD 0 0 ns
tRHDZ 30, 31 Data float after RD 65 2tCLCL–60 ns
tLLDV 30, 31 ALE low to valid data in 350 8tCLCL–150 ns
tAVDV 30, 31 Address to valid data in 397 9tCLCL–165 ns
tLLWL 30, 31 ALE low to RD or WR low 137 239 3tCLCL–50 3tCLCL+50 ns
tAVWL 30, 31 Address valid to WR low or RD low 122 4tCLCL–130 ns
tQVWX 30, 31 Data valid to WR transition 13 tCLCL–50 ns
tWHQX 30, 31 Data hold after WR 13 tCLCL–50 ns
tQVWH 31 Data valid to WR high 287 7tCLCL–150 ns
tRLAZ 30, 31 RD low to address float 0 0 ns
tWHLH 30, 31 RD or WR high to ALE high 23 103 tCLCL–40 tCLCL+40 ns
External Clock
tCHCX 33 High time 20 20 tCLCL–tCLCX ns
tCLCX 33 Low time 20 20 tCLCL–tCHCX ns
tCLCH 33 Rise time 20 20 ns
tCHCL 33 Fall time 20 20 ns
Shift Register
tXLXL 32 Serial port clock cycle time 750 12tCLCL ns
tQVXH 32 Output data setup to clock rising edge 492 10tCLCL–133 ns
tXHQX 32 Output data hold after clock rising edge 8 2tCLCL–117 ns
tXHDX 32 Input data hold after clock rising edge 0 0 ns
tXHDV 32 Clock rising edge to input data valid 492 10tCLCL–133 ns
NOTES:
1. Parameters are valid over operating temperature range unless otherwise specified.
2. Load capacitance for port 0, ALE, and PSEN = 100pF, load capacitance for all other outputs = 80pF.
3. Interfacing the microcontroller to devices with float times up to 45ns is permitted. This limited bus contention will not cause damage to Port 0
drivers.
4. See application note AN457 for external memory interface.
5. Parts are guaranteed to operate down to 0Hz.
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 39
AC ELECTRICAL CHARACTERISTICS
Tamb = 0°C to +70°C or –40°C to +85°C, VCC = 5V ±10%, VSS = 0V1, 2, 3
VARIABLE CLOCK433MHz CLOCK
SYMBOL FIGURE PARAMETER MIN MAX MIN MAX UNIT
tLHLL 29 ALE pulse width 2tCLCL–40 21 ns
tAVLL 29 Address valid to ALE low tCLCL–25 5 ns
tLLAX 29 Address hold after ALE low tCLCL–25 ns
tLLIV 29 ALE low to valid instruction in 4tCLCL–65 55 ns
tLLPL 29 ALE low to PSEN low tCLCL–25 5 ns
tPLPH 29 PSEN pulse width 3tCLCL–45 45 ns
tPLIV 29 PSEN low to valid instruction in 3tCLCL–60 30 ns
tPXIX 29 Input instruction hold after PSEN 0 0 ns
tPXIZ 29 Input instruction float after PSEN tCLCL–25 5 ns
tAVIV 29 Address to valid instruction in 5tCLCL–80 70 ns
tPLAZ 29 PSEN low to address float 10 10 ns
Data Memory
tRLRH 30, 31 RD pulse width 6tCLCL–100 82 ns
tWLWH 30, 31 WR pulse width 6tCLCL–100 82 ns
tRLDV 30, 31 RD low to valid data in 5tCLCL–90 60 ns
tRHDX 30, 31 Data hold after RD 0 0 ns
tRHDZ 30, 31 Data float after RD 2tCLCL–28 32 ns
tLLDV 30, 31 ALE low to valid data in 8tCLCL–150 90 ns
tAVDV 30, 31 Address to valid data in 9tCLCL–165 105 ns
tLLWL 30, 31 ALE low to RD or WR low 3tCLCL–50 3tCLCL+50 40 140 ns
tAVWL 30, 31 Address valid to WR low or RD low 4tCLCL–75 45 ns
tQVWX 30, 31 Data valid to WR transition tCLCL–30 0 ns
tWHQX 30, 31 Data hold after WR tCLCL–25 5 ns
tQVWH 31 Data valid to WR high 7tCLCL–130 80 ns
tRLAZ 30, 31 RD low to address float 0 0 ns
tWHLH 30, 31 RD or WR high to ALE high tCLCL–25 tCLCL+25 5 55 ns
External Clock
tCHCX 33 High time 0.38tCLCL tCLCL–tCLCX ns
tCLCX 33 Low time 0.38tCLCL tCLCL–tCHCX ns
tCLCH 33 Rise time 5 ns
tCHCL 33 Fall time 5 ns
Shift Register
tXLXL 32 Serial port clock cycle time 12tCLCL 360 ns
tQVXH 32 Output data setup to clock rising edge 10tCLCL–133 167 ns
tXHQX 32 Output data hold after clock rising edge 2tCLCL–80 ns
tXHDX 32 Input data hold after clock rising edge 0 0 ns
tXHDV 32 Clock rising edge to input data valid 10tCLCL–133 167 ns
NOTES:
1. Parameters are valid over operating temperature range unless otherwise specified.
2. Load capacitance for port 0, ALE, and PSEN = 100pF, load capacitance for all other outputs = 80pF.
3. Interfacing the microcontroller to devices with float times up to 45ns is permitted. This limited bus contention will not cause damage to Port 0
drivers.
4. For frequencies equal or less than 16MHz, see 16MHz “AC Electrical Characteristics”, page 38.
5. Parts are guaranteed to operate down to 0Hz.
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 40
EXPLANATION OF THE AC SYMBOLS
Each timing symbol has five characters. The first character is always
‘t’ (= time). The other characters, depending on their positions,
indicate the name of a signal or the logical status of that signal. The
designations are:
A – Address
C – Clock
D – Input data
H – Logic level high
I – Instruction (program memory contents)
L – Logic level low, or ALE
P – PSEN
Q – Output data
R–RD
signal
t – Time
V – Valid
W– WR signal
X – No longer a valid logic level
Z – Float
Examples: tAVLL = Time for address valid to ALE low.
tLLPL =Time for ALE low to PSEN low.
tPXIZ
ALE
PSEN
PORT 0
PORT 2 A0–A15 A8–A15
A0–A7 A0–A7
tAVLL
tPXIX
tLLAX
INSTR IN
tLHLL
tPLPH
tLLIV
tPLAZ
tLLPL
tAVIV
SU00006
tPLIV
Figure 29. External Program Memory Read Cycle
ALE
PSEN
PORT 0
PORT 2
RD
A0–A7
FROM RI OR DPL DATA IN A0–A7 FROM PCL INSTR IN
P2.0–P2.7 OR A8–A15 FROM DPF A0–A15 FROM PCH
tWHLH
tLLDV
tLLWL tRLRH
tLLAX
tRLAZ
tAVLL tRHDX
tRHDZ
tAVWL
tAVDV
tRLDV
SU00025
Figure 30. External Data Memory Read Cycle
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 41
tLLAX
ALE
PSEN
PORT 0
PORT 2
WR
A0–A7
FROM RI OR DPL DATA OUT A0–A7 FROM PCL INSTR IN
P2.0–P2.7 OR A8–A15 FROM DPF A0–A15 FROM PCH
tWHLH
tLLWL tWLWH
tAVLL
tAVWL
tQVWX tWHQX
tQVWH
SU00026
Figure 31. External Data Memory Write Cycle
012345678
INSTRUCTION
ALE
CLOCK
OUTPUT DATA
WRITE TO SBUF
INPUT DATA
CLEAR RI
VALID VALID VALID VALID VALID VALID VALID VALID
SET TI
SET RI
tXLXL
tQVXH tXHQX
tXHDX
tXHDV
SU00027
12304567
Figure 32. Shift Register Mode Timing
VCC–0.5
0.45V 0.7VCC
0.2VCC–0.1
tCHCL
tCLCL
tCLCH
tCLCX
tCHCX
SU00009
Figure 33. External Clock Drive
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 42
VCC–0.5
0.45V
0.2VCC+0.9
0.2VCC–0.1
NOTE:
AC inputs during testing are driven at VCC –0.5 for a logic ‘1’ and 0.45V for a logic ‘0’.
Timing measurements are made at VIH min for a logic ‘1’ and VIL max for a logic ‘0’.
SU00717
Figure 34. AC Testing Input/Output
VLOAD
VLOAD+0.1V
VLOAD–0.1V
VOH–0.1V
VOL+0.1V
NOTE:
TIMING
REFERENCE
POINTS
For timing purposes, a port is no longer floating when a 100mV change from
load voltage occurs, and begins to float when a 100mV change from the loaded
VOH/VOL level occurs. IOH/IOL ≥ ±20mA.
SU00718
Figure 35. Float Waveform
SU00837A
TYP ACTIVE MODE
MAX IDLE MODE
TYP IDLE MODE
MAX ACTIVE
MODE (EXCEPT
8XC51RD+)
ICCMAX = 0.9 X
FREQ. + 1.1
5
481216
FREQ AT XTAL1 (MHz)
20 24 28 32 36
15
25
30
ICC(mA)
10
20
35
ICCMAX ACTIVE MODE
(8XC51RD+)
ICCMAX = 0.9 X FREQ + 2.1
Figure 36. ICC vs. FREQ
Valid only within frequency specifications of the device under test
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 43
VCC
P0
EA
RST
XTAL1
XTAL2
VSS
VCC
VCC
VCC
ICC
(NC)
CLOCK SIGNAL
SU00719
Figure 37. ICC Test Condition, Active Mode
All other pins are disconnected
VCC
P0
EA
RST
XTAL1
XTAL2
VSS
VCC
VCC
ICC
(NC)
CLOCK SIGNAL
SU00720
Figure 38. ICC Test Condition, Idle Mode
All other pins are disconnected
VCC–0.5
0.45V 0.7VCC
0.2VCC–0.1
tCHCL
tCLCL
tCLCH
tCLCX
tCHCX
SU00009
Figure 39. Clock Signal W aveform for ICC Tests in Active and Idle Modes
tCLCH = tCHCL = 5ns
VCC
P0
EA
RST
XTAL1
XTAL2
VSS
VCC
VCC
ICC
(NC)
SU00016
Figure 40. ICC Test Condition, Power Down Mode
All other pins are disconnected. VCC = 2V to 5.5V
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 44
EPROM CHARACTERISTICS
All these devices can be programmed by using a modified Improved
Quick-Pulse Programming algorithm. It differs from older methods
in the value used for VPP (programming supply voltage) and in the
width and number of the ALE/PROG pulses.
The family contains two signature bytes that can be read and used
by an EPROM programming system to identify the device. The
signature bytes identify the device as being manufactured by
Philips.
Table 9 shows the logic levels for reading the signature byte, and for
programming the program memory, the encryption table, and the
security bits. The circuit configuration and waveforms for quick-pulse
programming are shown in Figures 41 and 42. Figure 43 shows the
circuit configuration for normal program memory verification.
Quick-Pulse Programming
The setup for microcontroller quick-pulse programming is shown in
Figure 41. Note that the device is running with a 4 to 6MHz
oscillator. The reason the oscillator needs to be running is that the
device is executing internal address and program data transfers.
The address of the EPROM location to be programmed is applied to
ports 1 and 2, as shown in Figure 41. The code byte to be
programmed into that location is applied to port 0. RST, PSEN and
pins of ports 2 and 3 specified in Table 9 are held at the ‘Program
Code Data’ levels indicated in Table 9. The ALE/PROG is pulsed
low 5 times as shown in Figure 42.
To program the encryption table, repeat the 5 pulse programming
sequence for addresses 0 through 1FH, using the ‘Pgm Encryption
Table’ levels. Do not forget that after the encryption table is
programmed, verification cycles will produce only encrypted data.
To program the security bits, repeat the 5 pulse programming
sequence using the ‘Pgm Security Bit’ levels. After one security bit is
programmed, further programming of the code memory and
encryption table is disabled. However, the other security bits can still
be programmed.
Note that the EA/VPP pin must not be allowed to go above the
maximum specified VPP level for any amount of time. Even a narrow
glitch above that voltage can cause permanent damage to the
device. The VPP source should be well regulated and free of glitches
and overshoot.
Program Verification
If security bits 2 and 3 have not been programmed, the on-chip
program memory can be read out for program verification. The
address of the program memory locations to be read is applied to
ports 1 and 2 as shown in Figure 43. The other pins are held at the
‘Verify Code Data’ levels indicated in Table 9. The contents of the
address location will be emitted on port 0. External pull-ups are
required on port 0 for this operation.
If the 64 byte encryption table has been programmed, the data
presented at port 0 will be the exclusive NOR of the program byte
with one of the encryption bytes. The user will have to know the
encryption table contents in order to correctly decode the verification
data. The encryption table itself cannot be read out.
Reading the Signature Bytes
The signature bytes are read by the same procedure as a normal
verification of locations 030H and 031H, except that P3.6 and P3.7
need to be pulled to a logic low. The values are:
(030H) = 15H indicates manufactured by Philips
(031H) = 97H indicates 87C52
BBH indicates 87C54
BDH indicates 87C58
B1H indicates 87C51FA
B2H indicates 87C51FB
B3H indicates 87C51FC
CAH indicates 87C51RA+
CBH indicates 87C51RB+
CCH indicates 87C51RC+
CDH indicates 87C51RD+
(060H) = NA
Program/Verify Algorithms
Any algorithm in agreement with the conditions listed in Table 9, and
which satisfies the timing specifications, is suitable.
Security Bits
With none of the security bits programmed the code in the program
memory can be verified. If the encryption table is programmed, the
code will be encrypted when verified. When only security bit 1 (see
Table 10) is programmed, MOVC instructions executed from
external program memory are disabled from fetching code bytes
from the internal memory, EA is latched on Reset and all further
programming of the EPROM is disabled. When security bits 1 and 2
are programmed, in addition to the above, verify mode is disabled.
When all three security bits are programmed, all of the conditions
above apply and all external program memory execution is disabled.
Encryption Array
64 bytes of encryption array are initially unprogrammed (all 1s).
T rademark phrase of Intel Corporation.
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 45
Table 9. EPROM Programming Modes
MODE RST PSEN ALE/PROG EA/VPP P2.7 P2.6 P3.7 P3.6
Read signature 10 1 10000
Program code data 1 0 0* VPP 1011
Verify code data 10 1 10011
Pgm encryption table 1 0 0* VPP 1010
Pgm security bit 1 1 0 0* VPP 1111
Pgm security bit 2 1 0 0* VPP 1100
Pgm security bit 3 1 0 0* VPP 0101
NOTES:
1. ‘0’ = Valid low for that pin, ‘1’ = valid high for that pin.
2. VPP = 12.75V ±0.25V.
3. VCC = 5V±10% during programming and verification.
* ALE/PROG receives 5 programming pulses for code data (also for user array; 5 pulses for encryption or security bits) while VPP is held at
12.75V. Each programming pulse is low for 100µs (±10µs) and high for a minimum of 10µs.
Table 10. Program Security Bits for EPROM Devices
PROGRAM LOCK BITS1, 2
SB1 SB2 SB3 PROTECTION DESCRIPTION
1 U U U No Program Security features enabled. (Code verify will still be encrypted by the Encryption Array if
programmed.)
2 P U U MOVC instructions executed from external program memory are disabled from fetching code bytes
from internal memory, EA is sampled and latched on Reset, and further programming of the EPROM
is disabled.
3 P P U Same as 2, also verify is disabled.
4 P P P Same as 3, external execution is disabled.
NOTES:
1. P – programmed. U – unprogrammed.
2. Any other combination of the security bits is not defined.
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 46
A0–A7
1
1
1
4–6MHz
+5V
PGM DATA
+12.75V
5 PULSES TO GROUND
0
1
0
A8–A13
P1
RST
P3.6
P3.7
XTAL2
XTAL1
VSS
VCC
P0
EA/VPP
ALE/PROG
PSEN
P2.7
P2.6
P2.0–P2.5
OTP
A14
P3.4
SU00838A
P3.5A8–A15 are programming addresses
(not external memory addresses per
device pin out)
A15 (RD+ ONLY)
Figure 41. Programming Configuration
ALE/PROG:
ALE/PROG:
1
0
1
0
5 PULSES
tGLGH = 100µs±10µstGHGL = 10µs MIN
SU00875
12345
SEE EXPLODED VIEW BELOW
1
Figure 42. PROG Waveform
A0–A7
1
1
1
+5V
PGM DATA
1
1
0
0 ENABLE
0
A8–A13
P1
RST
P3.6
P3.7
XTAL2
XTAL1
VSS
VCC
P0
EA/VPP
ALE/PROG
PSEN
P2.7
P2.6
P2.0–P2.5
OTP
A14
P3.4
SU00870
4–6MHz
A8–A15 are programming addresses
(not external memory addresses per
device pin out)
P3.5 A15 (RD+ ONLY)
Figure 43. Program Verification
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 47
EPROM PROGRAMMING AND VERIFICATION CHARACTERISTICS
Tamb = 21°C to +27°C, VCC = 5V±10%, VSS = 0V (See Figure 44)
SYMBOL PARAMETER MIN MAX UNIT
VPP Programming supply voltage 12.5 13.0 V
IPP Programming supply current 50 1mA
1/tCLCL Oscillator frequency 4 6 MHz
tAVGL Address setup to PROG low 48tCLCL
tGHAX Address hold after PROG 48tCLCL
tDVGL Data setup to PROG low 48tCLCL
tGHDX Data hold after PROG 48tCLCL
tEHSH P2.7 (ENABLE) high to VPP 48tCLCL
tSHGL VPP setup to PROG low 10 µs
tGHSL VPP hold after PROG 10 µs
tGLGH PROG width 90 110 µs
tAVQV Address to data valid 48tCLCL
tELQZ ENABLE low to data valid 48tCLCL
tEHQZ Data float after ENABLE 0 48tCLCL
tGHGL PROG high to PROG low 10 µs
NOTE:
1. Not tested.
PROGRAMMING*VERIFICATION*
ADDRESS ADDRESS
DATA IN DATA OUT
LOGIC 1 LOGIC 1
LOGIC 0
tAVQV
tEHQZ
tELQV
tSHGL tGHSL
tGLGH tGHGL
tAVGL tGHAX
tDVGL tGHDX
P1.0–P1.7
P2.0–P2.5
P3.4
(A0 – A14)
PORT 0
P0.0 – P0.7
(D0 – D7)
ALE/PROG
EA/VPP
P2.7
**
SU00871
tEHSH
NOTES:
*FOR PROGRAMMING CONFIGURATION SEE FIGURE 41.
FOR VERIFICATION CONDITIONS SEE FIGURE 43.
** SEE TABLE 9. Figure 44. EPROM Programming and Verification
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 48
MASK ROM DEVICES
Security Bits
With none of the security bits programmed the code in the program
memory can be verified. If the encryption table is programmed, the
code will be encrypted when verified. When only security bit 1 (see
Table 11) is programmed, MOVC instructions executed from external
program memory are disabled from fetching code bytes from the
internal memory, EA is latched on Reset and all further programming
of the EPROM is disabled. When security bits 1 and 2 are
programmed, in addition to the above, verify mode is disabled.
Encryption Array
64 bytes of encryption array are initially unprogrammed (all 1s).
Table 11. Program Security Bits
PROGRAM LOCK BITS1, 2
SB1 SB2 PROTECTION DESCRIPTION
1 U U No Program Security features enabled.
(Code verify will still be encrypted by the Encryption Array if programmed.)
2 P U MOVC instructions executed from external program memory are disabled from fetching code bytes from
internal memory, EA is sampled and latched on Reset, and further programming of the EPROM is disabled.
NOTES:
1. P – programmed. U – unprogrammed.
2. Any other combination of the security bits is not defined.
ROM CODE SUBMISSION FOR 8K ROM DEVICES (80C52, 83C51FA, AND 83C51RA+)
When submitting ROM code for the 8k ROM devices, the following must be specified:
1. 8k byte user ROM data
2. 64 byte ROM encryption key
3. ROM security bits.
ADDRESS CONTENT BIT(S) COMMENT
0000H to 1FFFH DATA 7:0 User ROM Data
2000H to 203FH KEY 7:0 ROM Encryption Key
FFH = no encryption
2040H SEC 0ROM Security Bit 1
0 = enable security
1 = disable security
2040H SEC 1ROM Security Bit 2
0 = enable security
1 = disable security
Security Bit 1: When programmed, this bit has two effects on masked ROM parts:
1. External MOVC is disabled, and
2. EA is latched on Reset.
Security Bit 2: When programmed, this bit inhibits V erify User ROM.
NOTE: Security Bit 2 cannot be enabled unless Security Bit 1 is enabled.
If the ROM Code file does not include the options, the following information must be included with the ROM code.
For each of the following, check the appropriate box, and send to Philips along with the code:
Security Bit #1: Enabled Disabled
Security Bit #2: Enabled Disabled
Encryption: No Yes If Yes, must send key file.
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 49
ROM CODE SUBMISSION FOR 16K ROM DEVICES (80C54, 83C51FB AND 83C51RB+)
When submitting ROM code for the 16K ROM devices, the following must be specified:
1. 16k byte user ROM data
2. 64 byte ROM encryption key
3. ROM security bits.
ADDRESS CONTENT BIT(S) COMMENT
0000H to 3FFFH DATA 7:0 User ROM Data
4000H to 403FH KEY 7:0 ROM Encryption Key
FFH = no encryption
4040H SEC 0ROM Security Bit 1
0 = enable security
1 = disable security
4040H SEC 1ROM Security Bit 2
0 = enable security
1 = disable security
Security Bit 1: When programmed, this bit has two effects on masked ROM parts:
1. External MOVC is disabled, and
2. EA is latched on Reset.
Security Bit 2: When programmed, this bit inhibits Verify User ROM.
NOTE: Security Bit 2 cannot be enabled unless Security Bit 1 is enabled.
If the ROM Code file does not include the options, the following information must be included with the ROM code.
For each of the following, check the appropriate box, and send to Philips along with the code:
Security Bit #1: Enabled Disabled
Security Bit #2: Enabled Disabled
Encryption: No Yes If Yes, must send key file.
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 50
ROM CODE SUBMISSION FOR 32K ROM DEVICES (80C58, 83C51FC, AND 83C51RC+)
When submitting ROM code for the 32K ROM devices, the following must be specified:
1. 32k byte user ROM data
2. 64 byte ROM encryption key
3. ROM security bits.
ADDRESS CONTENT BIT(S) COMMENT
0000H to 7FFFH DATA 7:0 User ROM Data
8000H to 803FH KEY 7:0 ROM Encryption Key
FFH = no encryption
8040H SEC 0ROM Security Bit 1
0 = enable security
1 = disable security
8040H SEC 1ROM Security Bit 2
0 = enable security
1 = disable security
Security Bit 1: When programmed, this bit has two effects on masked ROM parts:
1. External MOVC is disabled, and
2. EA is latched on Reset.
Security Bit 2: When programmed, this bit inhibits Verify User ROM.
NOTE: Security Bit 2 cannot be enabled unless Security Bit 1 is enabled.
If the ROM Code file does not include the options, the following information must be included with the ROM code.
For each of the following, check the appropriate box, and send to Philips along with the code:
Security Bit #1: Enabled Disabled
Security Bit #2: Enabled Disabled
Encryption: No Yes If Yes, must send key file.
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 51
ROM CODE SUBMISSION FOR 64K ROM DEVICE (83C51RD+)
When submitting ROM code for the 64K ROM devices, the following must be specified:
1. 64k byte user ROM data
2. 64 byte ROM encryption key
3. ROM security bits.
ADDRESS CONTENT BIT(S) COMMENT
0000H to FFFFH DATA 7:0 User ROM Data
10000H to 1003FH KEY 7:0 ROM Encryption Key
FFH = no encryption
10040H SEC 0ROM Security Bit 1
0 = enable security
1 = disable security
10040H SEC 1ROM Security Bit 2
0 = enable security
1 = disable security
Security Bit 1: When programmed, this bit has two effects on masked ROM parts:
1. External MOVC is disabled, and
2. EA is latched on Reset.
Security Bit 2: When programmed, this bit inhibits Verify User ROM.
NOTE: Security Bit 2 cannot be enabled unless Security Bit 1 is enabled.
If the ROM Code file does not include the options, the following information must be included with the ROM code.
For each of the following, check the appropriate box, and send to Philips along with the code:
Security Bit #1: Enabled Disabled
Security Bit #2: Enabled Disabled
Encryption: No Yes If Yes, must send key file.
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 52
QFP44: plastic quad flat package; 44 leads (lead length 1.3 mm); body 10 x 10 x 1.75 mm SOT307-2
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 53
PLCC44: plastic leaded chip carrier; 44 leads SOT187-2
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 54
DIP40: plastic dual in-line package; 40 leads (600 mil) SOT129-1
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 55
NOTES
Philips Semiconductors Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
1999 Apr 01 56
Definitions
Short-form specification — The data in a short-form specification is extracted from a full data sheet with the same type number and title. For
detailed information see the relevant data sheet or data handbook.
Limiting values definition — Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one
or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or
at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended
periods may af fect device reliability.
Application information — Applications that are described herein for any of these products are for illustrative purposes only. Philips
Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or
modification.
Disclaimers
Life support — These products are not designed for use in life support appliances, devices or systems where malfunction of these products can
reasonably be expected to result in personal injury . Philips Semiconductors customers using or selling these products for use in such applications
do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application.
Right to make changes — Philips Semiconductors reserves the right to make changes, without notice, in the products, including circuits, standard
cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no
responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these
products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless
otherwise specified.
Philips Semiconductors
811 East Arques Avenue
P.O. Box 3409
Sunnyvale, California 94088–3409
Telephone 800-234-7381
Copyright Philips Electronics North America Corporation 1999
All rights reserved. Printed in U.S.A.
Date of release: 04-99
Document order number: 9397 750 05509
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Data sheet
status
Objective
specification
Preliminary
specification
Product
specification
Product
status
Development
Qualification
Production
Definition [1]
This data sheet contains the design target or goal specifications for product development.
Specification may change in any manner without notice.
This data sheet contains preliminary data, and supplementary data will be published at a later date.
Philips Semiconductors reserves the right to make chages at any time without notice in order to
improve design and supply the best possible product.
This data sheet contains final specifications. Philips Semiconductors reserves the right to make
changes at any time without notice in order to improve design and supply the best possible product.
Data sheet status
[1] Please consult the most recently issued datasheet before initiating or completing a design.