SC83C451CGA68 datasheet(2/22 Pages) PHILIPS

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Philips Semiconductors

Product specification

80C451/83C451/87C451

80C51 8-bit microcontroller family

4K/128 OTP/ROM/ROMless, expanded I/O

1998 May 01

853-0830 19327

DESCRIPTION

The Philips 8XC451 is an I/O expanded single-chip microcontroller

fabricated with Philips high-density CMOS technology. Philips

epitaxial substrate minimizes latch-up sensitivity.

The 8XC451 (includes the 80C451, 87C451 and 83C451) is a

functional extension of the 87C51 microcontroller with three

additional I/O ports and four I/O control lines for a total of 68 pins.

Four control lines associated with port 6 facilitate high-speed

asynchronous I/O functions.

The 8XC451 includes a 4k

× 8 ROM (83C451) EPROM (87C451), a

128

× 8 RAM, 56 I/O, two 16-bit timer/counters, a five source, two

priority level, nested interrupt structure, a serial I/O port for either a

full duplex UART, I/O expansion, or multi-processor

communications, and on-chip oscillator and clock circuits. The

80C451 ROMless version includes all of the 83C451 features except

the on-board 4k

× 8 ROM.

The 87C451 has 4k of EPROM on-chip as program memory and is

otherwise identical to the 83C451.

The 8XC451 has two software selectable modes of reduced activity

for further power reduction; idle mode and power-down mode. Idle

mode freezes the CPU while allowing the RAM, timers, serial port,

and interrupt system to continue functioning. Power-down mode

freezes the oscillator, causing all other chip functions to be

inoperative while maintaining the RAM contents.

FEATURES

• 80C51 based architecture

• Seven 8-bit I/O ports

• Port 6 features:

– Eight data pins

– Four control pins

– Direct MPU bus interface

– Parallel printer interface

• On the microcontroller:

– 4k

× 8 ROM (83C451)

× 8 EPROM (87C451)

ROMless version (80C451)

– 128

× 8 RAM

– Two 16-bit counter/timers

– Two external interrupts

• External memory addressing capability

– 64k ROM and 64k RAM

• Low power consumption:

– Normal operation: less than 24mA at 5V, 12MHz

– Idle mode

– Power-down mode

PIN CONFIGURATION

LCC

Function

1EA/VPP

P2.0/A8

P2.1/A9

P2.2/A10

P2.3/A11

P2.4/A12

P2.5/A13

P2.6/A14

P2.7/A15

P0.7/AD7

P0.6/AD6

P0.5/AD5

P0.4/AD4

P0.3/AD3

P0.2/AD2

P0.1/AD1

P0.0/AD0

VCC

P4.7

P4.6

P4.5

P4.4

P4.3

Function

P4.2

P4.1

P4.0

P1.0

P1.1

P1.2

P1.3

P1.4

P1.5

P1.6

P1.7

RST

P3.0/RxD

P3.1/TxD

P3.2/INT0

P3.3/INT1

P3.4/T0

P3.5/T1

P3.6/WR

P3.7/RD

P5.0

P5.1

P5.2

Function

P5.3

P5.4

P5.5

P5.6

P5.7

XTAL2

XTAL1

VSS

ODS

IDS

BFLAG

AFLAG

P6.0

P6.1

P6.2

P6.3

P6.4

P6.5

P6.6

P6.7

PSEN

ALE/PROG

SU00084A

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