Philips Semiconductors Product specification
80C51/87C51/80C52/87C52
80C51 8-bit microcontroller family
4 K/8 K OTP/ROM low voltage (2.7 V–5.5 V),
low power, high speed (33 MHz), 128/256 B RAM
2
2000 Aug 07 853–0169 24291
DESCRIPTION
The Philips 80C51/87C51/80C52/87C52 is a high-performance
static 80C51 design fabricated with Philips high-density CMOS
technology with operation from 2.7 V to 5.5 V.
The 8xC51 and 8xC52 contain a 128 × 8 RAM and 256 × 8 RAM
respectively, 32 I/O lines, three 16-bit counter/timers, a six-source,
four-priority level nested interrupt structure, a serial I/O port for
either multi-processor communications, I/O expansion or full duplex
UART, and on-chip oscillator and clock circuits.
In addition, the device is a low power static design which offers a
wide range of operating frequencies down to zero. Two software
selectable modes of power reduction—idle mode and power-down
mode are available. The idle mode freezes the CPU while allowing
the RAM, timers, serial port, and interrupt system to continue
functioning. The power-down mode saves the RAM contents but
freezes the oscillator, causing all other chip functions to be
inoperative. Since the design is static, the clock can be stopped
without loss of user data and then the execution resumed from the
point the clock was stopped.
SELECTION TABLE
For applications requiring more ROM and RAM, see the 8XC54/58
and 8XC51RA+/RB+/RC+/80C51RA+ data sheet.
Note: 80C31/80C32 is specified in separate data sheet.
ROM/EPROM
Memory Size
(X by 8)
RAM Size
(X by 8)
Programmable
Timer Counter
(PCA)
Hardware
Watch Dog
Timer
80C31*/80C51/87C51
0K/4K 128 No No
80C32*/80C52/87C52
0K/8K/16K/32K 256 No No
80C51RA+/8XC51RA+/RB+/RC+
0K/8K/16K/32K 512 Yes Yes
8XC51RD+
64K 1024 Yes Yes
FEATURES
• 8051 Central Processing Unit
– 4k × 8 ROM (80C51)
– 8k × 8 ROM (80C52)
– 128 × 8 RAM (80C51)
– 256 × 8 RAM (80C52)
– Three 16-bit counter/timers
– Boolean processor
– Full static operation
– Low voltage (2.7 V to 5.5 V@ 16 MHz) operation
• Memory addressing capability
– 64k ROM and 64k RAM
• Power control modes:
– Clock can be stopped and resumed
– Idle mode
– Power-down mode
• CMOS and TTL compatible
• TWO speed ranges at V
CC
= 5 V
– 0 to 16 MHz
– 0 to 33 MHz
• Three package styles
• Extended temperature ranges
• Dual Data Pointers
• Security bits:
– ROM (2 bits)
– OTP/EPROM (3 bits)
• Encryption array – 64 bytes
• 4 level priority interrupt
• 6 interrupt sources
• Four 8-bit I/O ports
• Full–duplex enhanced UART
– Framing error detection
– Automatic address recognition
• Programmable clock out
• Asynchronous port reset
• Low EMI (inhibit ALE and slew rate controlled outputs)
• Wake-up from Power Down by an external interrupt
