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80C251SA

HIGH-PERFORMANCE CHMOS MICROCONTROLLER

Intel 

PRELIMINARY

8XC251SA/SB/SP/SQ

HIGH-PERFORMANCE

CHMOS MICROCONTROLLER

Commercial/Express

s Real-time and Programmed Wait State

Bus Operation

s Binary-code Compatible with MCS® 51

s Pin Compatible with 44-pin PLCC and 40-

pin PDIP MCS 51 Sockets

s Register-based MCS® 251 Architecture

— 40-byte Register File

— Registers Accessible as Bytes, Words,

or Double Words

s Enriched MCS 51 Instruction Set

— 16-bit and 32-bit Arithmetic and Logic

Instructions

— Compare and Conditional Jump

Instructions

— Expanded Set of Move Instructions

s Linear Addressing

s 256-Kbyte Expanded External Code/Data

Memory Space

s ROM/OTPROM/EPROM Options:

16 Kbytes (SB/SQ), 8 Kbytes (SA/SP), or

without ROM/OTPROM/EPROM

s 16-bit Internal Code Fetch

s 64-Kbyte Extended Stack Space

s On-chip Data RAM Options:

1-Kbyte (SA/SB) or 512-Byte (SP/SQ)

s 8-bit, 2-clock External Code Fetch in

Page Mode

s Fast MCS 251 Instruction Pipeline

s User-selectable Configurations:

— External Wait States (0-3 wait states)

— Address Range & Memory Mapping

— Page Mode

s 32 Programmable I/O Lines

s Seven Maskable Interrupt Sources

with Four Programmable Priority

Levels

s Three Flexible 16-bit Timer/counters

s Hardware Watchdog Timer

s Programmable Counter Array

— High-speed Output

— Compare/Capture Operation

— Pulse Width Modulator

— Watchdog Timer

s Programmable Serial I/O Port

— Framing Error Detection

— Automatic Address Recognition

s High-performance CHMOS Technology

s Static Standby to 16-MHz Operation

s Complete System Development

Support

— Compatible with Existing Tools

— New MCS 251 Tools Available:

Compiler, Assembler, Debugger, ICE

s Package Options (PDIP, PLCC, and

Ceramic DIP)

A member of the Intel family of 8-bit MCS 251 microcontrollers, the 8XC251SA/SB/SP/SQ is binary-code

compatible with MCS 51 microcontrollers and pin compatible with 40-pin PDIP and 44-pin PLCC MCS 51

microcontrollers. MCS 251 microcontrollers feature an enriched instruction set, linear addressing, and

efficient C-language support. The 8XC251SA/SB/SP/SQ has 512 bytes or 1 Kbyte of on-chip RAM and is

available with 8 Kbytes or 16 Kbytes of on-chip ROM/OTPROM/EPROM, or without ROM/OTPROM/EPROM.

A variety of features can be selected by new user-programmable configurations.

COPYRIGHT © INTEL CORPORATION, 1996

May 1996

Order Number: 272783-003

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