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87C51FA

CMOS single-chip 8-bit microcontrollers

Philips Electronics 

Philips Semiconductors

CMOS single-chip 8-bit microcontrollers

Product specification

87C51FA/87C51FB

DESCRIPTION

The 87C51FA and 87C51FB Single-Chip 8-Bit Microcontrollers are

manufactured in an advanced CMOS process and are derivatives of

the 80C51 microcontroller family. The 87C51FA/FB has the same

instruction set as the 80C51.

This device provides architectural enhancements that make it

applicable in a variety of applications for general control systems.

The 87C51FA contains 8k × 8 memory, and the 87C51FB contains

16k × 8 memory. They both contain a volatile 256 × 8 read/write data

memory, four 8-bit I/O ports, three 16-bit timer/event counters, a

Programmable Counter Array (PCA), a multi-source,

two-priority-level, nested interrupt structure, an enhanced UART and

on-chip oscillator and timing circuits. For systems that require extra

capability, the 87C51FA/FB 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.

See 83C51FA/83C51FB/83C51FC/80C51FA datasheet for ROM

and ROMless devices.

FEATURES

• 80C51 central processing unit

• 87C51FA: 8k × 8 EPROM

87C51FB: 16k × 8 EPROM

– expandable externally to 64k bytes

– Quick Pulse programming algorithm

– Two level program security system

• 256 × 8 RAM, expandable externally to 64k bytes

• Three 16-bit timer/counters

– T2 is an up/down counter

• Programmable Counter Array (PCA)

– High speed output

– Capture/compare

– Pulse Width Modulator

– Watchdog Timer

• Four 8-bit I/O ports

• Full-duplex enhanced UART

– Framing error detection

– Automatic address recognition

• Power control modes

– Idle mode

– Power-down mode

• Once (On Circuit Emulation) Mode

• Five package styles

• OTP package available

PIN CONFIGURATIONS

T2/P1.0 1

T2EX/P1.1 2

ECI/P1.2 3

CEX0/P1.3 4

CEX1/P1.4 5

CEX2/P1.5 6

CEX3/P1.6 7

CEX4/P1.7 8

RST 9

RxD/P3.0 10

TxD/P3.1 11

INT0/P3.2 12

INT1/P3.3 13

T0/P3.4 14

T1/P3.5 15

WR/P3.6 16

RD/P3.7 17

XTAL2 18

XTAL1 19

VSS 20

40 VCC

39 P0.0/AD0

38 P0.1/AD1

37 P0.2/AD2

36 P0.3/AD3

35 P0.4/AD4

34 P0.5/AD5

33 P0.6/AD6

32 P0.7/AD7

DUAL

IN-LINE

PACKAGE

31 EA

30 ALE

29 PSEN

28 P2.7/A15

27 P2.6/A14

26 P2.5/A13

25 P2.4/A12

24 P2.3/A11

23 P2.2/A10

22 P2.1/A9

21 P2.0/A8

SU00714A

1996 Aug 16

3-61

853–1692 17199

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