- 40-pin DIP packaging
- 12MHz working frequency (max)
- Working voltage of 5VDC
- Number of i / o 32
- 8051 Architecture
- Memory size of 4k Byte program
- 128 byte volatile data memory size
- Timer / counter Timer / Counter 16-bit
- UART peripheral interface
datasheet: https://docs.google.com/open?id=0BzkNNhuEnaF-aHlxdDJfczBPM00