This part is a kind of semiconductor called 80C31.

Function of this product has 8-bit microcontroller.

Manufacturers : NXP

Image and pinout :

Some of the text within the PDF file :

INTEGRATED CIRCUITS 80C31/80C32 80C51 8-bit microcontroller family 128/256 byte RAM ROMless low voltage (2.7 V–5.5 V), low power, high speed (33 MHz) Product specification IC28 Data Handbook 2000 Aug 07 Philips Semiconductors Philips Semiconductors 80C51 8-bit microcontroller family 128/256 byte RAM ROMless low voltage (2.7V–5.5V), low power, high speed (33 MHz) Product specification 80C31/80C32 DESCRIPTION The Philips 80C31/32 is a high-performance static 80C51 design fabricated with Philips high-density CMOS technology with operation from 2.7 V to 5.5 V. The 80C31/32 ROMless devices contain a 128 × 8 RAM/256 × 8 RAM, 32 I/O lines, three 16-bit counter/timers, a six-source, four-priority level nested interrupt structure, a serial I/O port for either multi-processor communicat [ ... ]

80C31 PDF Datasheet Download