The JS2051A1 CPU BOARD is a very small CPU board that uses an ATMEL AT89C2051 CPU. The AT89C2051 is an INTEL 8051 CPU compatible microcontroller. It has an extra analog comparator and internal 2K-byte Flash memory.

The JS2051A1 CPU BOARD has X-tal (22.1184 MHz), POW (Power On Reset) circuit, two LED's, test pin (GND), I/O extension ports. It is used for Mr. Line and Roamer.

Specifications

• Size: 36.8 x 20 mm
• CPU: AT89C205180C31 PLCC
• Clock: 22.1184 MHz
• Memory: Internal Flash 2k byte
• Display: LED x 2
• Expansion Port: 12 pin, 8 pin
• Power: DC 5V (Supplied by Port)

Features

• Small AT89C2051 CPU board
• Easily connect and disconnect to the user board
• 22.1184 MHz clock operating
• Up to 115,200 bps serial communication available
• Useful internal analog comparator
• Power On Reset Circuit
• Two user LED's
• Test Pin (GND)

Downloads
ATMEL AT89C2051 Datasheet (.pdf 298 Kb)
JS2051 CPU Board Schematic (.pdf 102 Kb)