描述 Description

Overview The Philips 80C31/32 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 80C31/32 ROMless devices contain a 128 ? 8 RAM/256 ? 8 RAM, 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.

特性 Features

8051 Central Processing Unit 128 ? 8 RAM (80C31)
256 ? 8 RAM (80C32)
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 VCC = 5 V 0 to 16 MHz
0 to 33 MHz

Three package styles
Extended temperature ranges
Dual Data Pointers
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)
Wake-up from Power Down by an external interrupt