This part is a kind of semiconductor called P8031AH.

Function of this product has (P80xxAH) MCS51 8-BIT CONTROL-ORIENTED MICROCONTROLLERS.

Manufacturers : Intel Corporation

Image and pinout :

Some of the text within the PDF file :

s mu @ MCS@51 8-BIT CONTROL-ORIENTED MICROCONTROLLERS Commercial/Express 8031AH18051AH18051AHP 8032N+18052N-I 8751W8751H-8 8751BW8752BI-I s High Performance HMOS Process s Internal Timers/Event Counters s 2-Level interrupt Priority Structure s 32 1/0 Lines (Four 8-Bit Ports) s 64K External Program Memory Space s Security Feature Protects EPROM Parts s Boolean Processor s Bit-Addressable RAM s Programmable Full Duplex Serial Channel s 111 Instructions (64 Single-Cycle) s s Extended Temperature Range 64K External Data Memory Space (–40”C to +85”C) Against Software Piracy The MCS@51 controllers are optimized for control applications. Byte-processing and numerical operations on small data structures are facilitated by a variety of fast addressing modes for accessing the internal [ ... ]

P8031AH PDF Datasheet Download