Using the 82C55 I/O Chips on the 8051 Development Board

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8051 Tools

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82C55 I/O

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8051 Dev Board, $79
LCD 20x2 Display, $11
Serial Cable, $5
12 Volt Power, $8
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Old Versions

Revision List
Rev 4 (2002)

Photos & Features
Getting Started
Example Code

LED Blink, C
LED Blink, Asm
LCD Display
Timers
82C55 I/O
More Code...

Memory Map
Ports & Pinouts
Schematic & Parts
Circuit Board
Construction
Troubleshooting

Rev 3 (2001)
Rev 2 (1997)
Rev 1 (1992)

Code Library
89C2051 Programmer
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Example Code Moved to Rev 5 Section

These example programs have been moved to the Rev 5 section, to avoid duplication of the code (where the old version would not be maintained). The Rev 4 and Rev 5 boards have an indentical memory map and are 100% compatible. Rev 5 adds diagnostic LEDs, an alternate power input, and other cosmetic usability improvements. Please refere to the Rev 5 section using these links:

LED Blink Example, Using the SDCC C Compiler
LED Blink Example, Using the AS31 Assembler
LCD Display Example Code
Using the 8051's Built-in Timers
Using the 82C55 I/O Chips
More Example Code

Using the 82C55 I/O Chips, Paul Stoffregen
http://www.pjrc.com/tech/8051/board4/82c55.html
Last updated: February 7, 2004
Status: finished
Suggestions, comments, criticisms: <paul@pjrc.com>