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PRELIMINARY
COPYRIGHT INTEL CORPORATION, 1996
May 1996
Order Number: 272783-003
8XC251SA/SB/SP/SQ
HIGH-PERFORMANCE
CHMOS MICROCONTROLLER
Commercial/Express
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.
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)
Information in this document is provided in connection with Intel products. No license, express or implied, by
estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in
Intel's Terms and Conditions of Sale for such products, Intel assumes no liability whatsoever, and Intel
disclaims any express or implied warranty, relating to sale and/or use of Intel products including liability or
warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright
or other intellectual property right. Intel products are not intended for use in medical, life saving, or life
sustaining applications.
Intel retains the right to make changes to specifications and product descriptions at any time, without notice.
*Third-party brands and names are the property of their respective owners.
Copies of documents which have an ordering number and are referenced in this document, or other Intel
literature, may be obtained from:
Intel Corporation
P.O. Box 7641
Mt. Prospect IL 60056-764
or call 1-800-548-4725
PRELIMINARY
3
8XC251SA/SB/SP/SQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER
Figure 1. 8XC251SA/SB/SP/SQ Block Diagram
SRC2 (8)
Code Address (24)
Clock & Reset
Code Bus (16)
Data RAM
512 Bytes
or
1024 Bytes
Code
OTPROM/ROM
8 Kbytes
or
16 Kbytes
Watchdog
Timer
Timer/
Counters
PCA
Serial I/O
Peripherals
Port 2
Drivers
P2.7:0
Port 0
Drivers
P0.7:0
Port 3
Drivers
P3.7:0
Port 1
Drivers
P1.7:0
Data Address (24)
Data Bus (8)
Memory Address (16)
MCS
251 Microcontroller Core
System Bus and I/O Ports
I/O Ports and
Peripheral Signals
SRC1 (8)
IB Bus (8)
Peripheral
Interface
Interrupt
Handler
Clock
&
Reset
Bus Interface
Instruction Sequencer
DST (16)
ALU
Data
Memory
Interface
Memory Data (16)
Register
File
8XC251SA/SB/SP/SQ Microcontroller
A4214-01
4
PRELIMINARY
8XC251SA/SB/SP/SQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER
1.0
NOMENCLATURE
Figure 2. The 8XC251SA/SB/SP/SQ Family Nomenclature
Table 1. Description of Product Nomenclature
Parameter
Options
Description
Temperature and Burn-in
Options
no mark
Commercial operating temperature range (0C to 70C) with
Intel standard burn-in.
T
Express operating temperature range (-40C to 85C) with
Intel standard burn-in.
Packaging Options
N
44-pin Plastic Leaded Chip Carrier (PLCC)
P
40-pin Plastic Dual In-line Package (PDIP)
C
40-pin Ceramic Dual In-line Package (Ceramic DIP)
Program Memory Options
0
Without ROM/OTPROM/EPROM
3
ROM
7
User programmable OTPROM/EPROM
Process Information
C
CHMOS
Product Family
251
8-bit control architecture
Device Memory Options
SA
1-Kbyte RAM/8-Kbyte ROM/OTPROM/EPROM
SB
1-Kbyte RAM/16-Kbyte ROM/OTPROM/EPROM or without
ROM/OTPROM/EPROM
SP
512-byte RAM/8-Kbyte ROM/OTPROM/EPROM
SQ
512-byte RAM/16-Kbyte ROM/OTPROM/EPROM or without
ROM/OTPROM/EPROM
Device Speed
16
External clock frequency
Program-memory Options
XXXXX
XX
X
X
8
XX
X
Packaging Options
Temperature and Burn-in Options
A2815-01
Process Information
Product Family Device Speed
PRELIMINARY
5
8XC251SA/SB/SP/SQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER
Table 2 lists the proliferation options. See Figure 2 for the 8XC251SA/SB/SP/SQ family nomenclature.
.
Table 3 lists the 8XC251SA/SB/SP/SQ packages.
Table 3. Package Information
Table 2. Proliferation Options
8XC251SA/SB/SP/SQ
(0 16 MHz; 5 V 10%)
80C251SB16
CPU-only
80C251SQ16
CPU-only
83C251SA16
ROM
83C251SB16
ROM
83C251SP16
ROM
83C251SQ16
ROM
87C251SA16
OTPROM/EPROM
87C251SB16
OTPROM/EPROM
87C251SP16
OTPROM/EPROM
87C251SQ16
OTPROM/EPROM
Pkg.
Definition
Temperature
N
44 ld. PLCC
0C to +70C
P
40 ld. Plastic DIP
0C to +70C
C
40 ld. Ceramic DIP
0C to +70C
TN
44 ld. PLCC
-40C to +85C
TP
40 ld. Plastic DIP
-40C to +85C