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INTEGRATED CIRCUITS
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
Philips
Semiconductors

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Philips Semiconductors
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
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
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)
80C31/8XC51
0K/4K
128 No
80C32/8XC52/54/58
0K/8K/16K/32K
256
No
80C51FA/8XC51FA/FB/FC
0K/8K/16K/32K
256
Yes
80C51RA+/8XC51RA+/RB+/RC+
0K/8K/16K/32K
512
Yes
8XC51RD+
64K
1024
Yes
Hardware
Watch Dog
Timer
No
No
No
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)
1999 Apr 01
2 853-2068 21142

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Philips Semiconductors
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
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
BLOCK DIAGRAM
VCC
VSS
RAM ADDR
REGISTER
RAM
P0.0–P0.7
PORT 0
DRIVERS
PORT 0
LATCH
P2.0–P2.7
PORT 2
DRIVERS
PORT 2
LATCH
ROM/EPROM
B
REGISTER
ACC
TMP2
TMP1
STACK
POINTER
8
PROGRAM
ADDRESS
REGISTER
PSEN
ALE/PROG
EAVPP
RST
TIMING
AND
CONTROL
PD
OSCILLATOR
XTAL1
XTAL2
ALU
PSW
PORT 1
LATCH
PORT 1
DRIVERS
P1.0–P1.7
SFRs
TIMERS
P.C.A. (FA & RA+ only)
PORT 3
LATCH
BUFFER
PC
INCRE-
MENTER
8
PROGRAM
COUNTER
DPTR’S
MULTIPLE
PORT 3
DRIVERS
P3.0–P3.7
16
SU00831B
1999 Apr 01
3