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P80C51HFH

Low-voltage single-chip 8-bit microcontrollers

Philips Electronics 

Philips Semiconductors

Low-voltage single-chip 8-bit microcontrollers

Product specification

80CL31/80CL51

BLOCK DIAGRAM

FREQUENNCY REFERENCE

XTAL2 XTAL1

COUNTER1

T0

T1

OSCILLATOR

AND TIMING

PROGRAM

MEMORY

(4K BY 8 ROM)

DATA MEMORY

(128 BY 8 RAM)

TWO 16-BIT TIMER/

EVENT COUNTERS

80CL51

CPU

10

3

64K BYTE BUS

EXPANSION

CONTROL

INTERNAL

INTERRUPTS

PROGRAMMABLE

I/O

PROGRAMMABLE

SERIAL PORT,

FULL DUPLEX UART,

SYNCHRONOUS

SHIFT

EXTERNAL ENTERRUPTS1

1. Pins shared with parallels ports pins.

FUNCTIONAL DIAGRAM

CONTROL

PARALLEL PORTS

ADDRESS/DATA BUS

I/O PINS

RXD TXD

(1)

VDD

VSS

RST

XTAL1

XTAL2

PORT 0

ADDRESS AND

DATA BUS

January 1995

ALTERNATIVE

FUNCTIONS

RxD/data

TxD/clock

INT0

INT1

T0

T1

WR

RD

EA

PSEN

ALE

PORT 3

PORT 1

INT2/INT9

PORT 2

ADDRESS BUS

5

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