8XC51RA RB RC
CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER
Commercial Express
87C51RA 83C51RA 80C51RA 87C51RB 83C51RB 87C51RC 83C51RC
See Table 1 for Proliferation Options
Y
High Performance CHMOS EPROM
ROM CPU
24 MHz Operation
512 Bytes of On-Chip Data RAM
Dedicated Hardware Watchdog Timer
(One-Time Enabled with Reset-Out)
Three 16-Bit Timer Counters
Programmable Clock Out
Up Down Timer Counter
Three Level Program Lock System
8K 16K 32K On-Chip Program Memory
Improved Quick Pulse Programming
Algorithm
Boolean Processor
32 Programmable I O Lines
Y
Y
6 Interrupt Sources
Programmable Serial Channel with
Framing Error Detection
Automatic Address Recognition
TTL and CMOS Compatible Logic
Levels
64K External Program Memory Space
64K External Data Memory Space
MCS
51 Compatible Instruction Set
Power Saving Idle and Power Down
Modes
ONCE (On-Circuit Emulation) Mode
Four-Level Interrupt Priority
Extended Temperature Range
(
b
40 C to
a
85 C)
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
MEMORY ORGANIZATION
ROMless
Device
80C51RA
80C51RA
80C51RA
ROM
Device
83C51RA
83C51RB
83C51RC
EPROM
Version
87C51RA
87C51RB
87C51RC
ROM EPROM
Bytes
8K
16K
32K
RAM
Bytes
512
512
512
These devices can address up to 64 Kbytes of external program data memory
The Intel 8XC51RA 8XC51RB 8XC51RC is a single-chip control-oriented microcontroller which is fabricated
on Intel鈥檚 reliable CHMOS III-E technology Being a member of the MCS 51 family of controllers the
8XC51RA 8XC51RB 8XC51RC uses the same powerful instruction set has the same architecture and is pin-
for-pin compatible with the existing MCS 51 family of products The 8XC51RA 8XC51RB 8XC51RC is an
enhanced version of the 8XC52 8XC54 8XC58 The added features make it an even more powerful microcon-
troller for applications that require 512 bytes of on-chip data RAM and dedicated hardware WatchDog Timer
with reset-out features
Throughout this document 8XC51RX will refer to the 8XC51RA 8XC51RB and 8XC51RC unless information
applies to a specific device
For a detailed description of 8XC51RA RB RC refer to the 8XC51RA RB RC Hardware Description order
number 272668
Other brands and names are the property of their respective owners
Information in this document is provided in connection with Intel products Intel assumes no liability whatsoever including infringement of any patent or
copyright for sale and use of Intel products except as provided in Intel鈥檚 Terms and Conditions of Sale for such products Intel retains the right to make
changes to these specifications at any time without notice Microcomputer Products may have minor variations to this specification known as errata
COPYRIGHT
INTEL CORPORATION 1995
December 1995
Order Number 272659-002