*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’s 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.
December 1995COPYRIGHT
©
INTEL CORPORATION, 1995 Order Number: 272659-002
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
Y
24 MHz Operation
Y
512 Bytes of On-Chip Data RAM
Y
Dedicated Hardware Watchdog Timer
(One-Time Enabled with Reset-Out)
Y
Three 16-Bit Timer/Counters
Y
Programmable Clock Out
Y
Up/Down Timer/Counter
Y
Three Level Program Lock System
Y
8K/16K/32K On-Chip Program Memory
Y
Improved Quick Pulse Programming
Algorithm
Y
Boolean Processor
Y
32 Programmable I/O Lines
Y
6 Interrupt Sources
Y
Programmable Serial Channel with:
Ð Framing Error Detection
Ð Automatic Address Recognition
Y
TTL and CMOS Compatible Logic
Levels
Y
64K External Program Memory Space
Y
64K External Data Memory Space
Y
MCS
É
51 Compatible Instruction Set
Y
Power Saving Idle and Power Down
Modes
Y
ONCE (On-Circuit Emulation) Mode
Y
Four-Level Interrupt Priority
Y
Extended Temperature Range
(
b
40
§
Cto
a
85
§
C)
MEMORY ORGANIZATION
ROMless ROM EPROM ROM/EPROM RAM
Device Device Version Bytes Bytes
80C51RA 83C51RA 87C51RA 8K 512
80C51RA 83C51RB 87C51RB 16K 512
80C51RA 83C51RC 87C51RC 32K 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’s 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.
