This part is a kind of semiconductor called N87C51FB.

Function of this product has (N87C51Fx) CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER.

Manufacturers : Intel Corporation

Image and pinout :

Some of the text within the PDF file :

87C51FA 87C51FB 87C51FC 87C51FC-20 CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER Automotive Y Y FX Core Architecture Device Extended Automotive Temperature Range ( b 40 C to a 125 C Ambient) Available in 12 MHz 16 MHz and 20 MHz Versions High Performance CHMOS EPROM Three 16-Bit Timer Counters Timer 2 (Up Down Counter) Programmable Counter Array with High Speed Output Compare Capture Pulse Width Modulator Watchdog Timer Capabilities One-to-Three Level Program Lock System on EPROM 8K On-Chip User Programmable EPROM in 87C51FA 16K On-Chip User Programmable EPROM in 87C51FB 32K On-Chip User Programmable EPROM in 87C51FC 256 Bytes of On-Chip Data RAM Y Y Y Y Y Quick Pulse Programming Algorithm Boolean Processor 32 Programmable I O Lines 7 Interrupt Sources Four Level Interrup [ ... ]

N87C51FB PDF Datasheet Download