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8XC51RA/RB/RC Expanded RAM Microcontroller
Product Overview
The 8xC51RA/RB/RC provide additional 256 Bytes of random access memory (RAM) space and
hardware Watch Dog Timer for increased data parameter handling, high level languages usage and
system reliability. They are code and pin compatible with existing MCS® 51 microcontrollers and
therefore allow easy upgrade paths to all MCS 51 microcontroller applications. The 8xC51RA/RB/RC
bring you all the benefits you would expect from the original innovator of the MCS 51 microcontroller
family.
Product Description
The Intel 8xC51RA/RB/RC belong to the new Expanded RAM microcontroller series based on the MCS
51 microcontroller architecture. The 8xC51RA/RB/RC are code and pin compatible with the existing
MCS 51 microcontrollers and therefore are direct `drop-in' replacements to existing MCS 51
microcontroller applications.
Products in this Expanded RAM series are:
- 80C51RA - ROMless + 512B RAM + WDT
- 83C51RA/87C51RA - 8KB ROM/EPROM + 512B RAM + WDT
- 83C51RB/87C51RB - 16KB ROM/EPROM + 512B RAM + WDT
- 83C51RC/87C51RC - 32KB ROM/EPROM + 512B RAM + WDT
These products are functionally compatible with the Intel 8xC52/54/58, except for the additional 256
Bytes of on-chip data RAM and hardware WDT. The new microcontrollers are specially designed to
accomodate increased data parameter handling and usage of high level languages. The hardware
WDT allows for increased system reliability. System development tools support are available
from Intel third party tools vendors.
Key Features
- MCS® 51 Microcontroller Compatible Instruction Set
- MHz to 24 MHz operation
- 8K/16K/32K On-Chip Program Memory
- Bytes On-Chip Data RAM
- Hardware Watchdog Timer (one time enabled)
- KBytes External Program Memory Space
- KBytes External Data Memory Space
- Programmable I/O Lines
- Three 16-Bit Timers/Counters
- Programmable Clock Out
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Up/Down Timer/Counter
Level Program Lock System
Interrupt Sources with 4 Priority Levels
Quick Pulse Programming Algorithm
Programmable Serial Channel with:
- Framing Error Detection
- Automatic Address Recognition
ALE Disable Feature to Reduce EMI Emission
Power Saving Idle and Power Down Modes
ONCE (On-Circuit Emulation) Mode
Available in 44Ld PLCC, with future offerings of 40Ld P-Dip and 44Ld QFP
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FEATURES | BENEFITS |
| Expanded internal RAM (512 btye) size |
Synergy. More working space on chip, breaks the 256-byte limitation |
| Dedicated hardware watchdog timer (WDT) |
Control. Improved system integrity control |
| Functionally compatible MCS® 51 microcontrollers |
Compatibility. Easy migration of existing designs |
| On-Chip peripherals (timer/counter, serial ports, I/O ports, etc.) |
High Integration. Enables low-cost and low-chip-count designs |
Support Tools
Intel provides hardware and software development tools to support the development of applications based
on the 8xC51RA/RB/RC. Tools include in-circuit emulators, assemblers, compilers and programmers.
Applications Information
The 8xC51RA/RB/RC microcontrollers will make ideal performance upgrade paths for all existing MCS
51 microcontroller applications. The 512 Byte on-chip data RAM available on the 8xC51RA/RB/RC make
them suited for applications requiring increased data parameter handling functions and high level
languages usage such as CD-ROM drives, scanners, intelligent security systems, wired handsets,
analog linecards and etc. |
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