This part is a kind of semiconductor called 89C55.

Function of this product has 8-Bit Microcontroller with 20K Bytes Flash.

Manufacturers : ATMEL Corporation

Image and pinout :

Some of the text within the PDF file :

AT89C55 Features • Compatible with MCS-51™ Products • 20K Bytes of In-System Reprogrammable Flash Memory • • • • • • • – Endurance: 1,000 Write/Erase Cycles Fully Static Operation: 0 Hz to 33 MHz Three-Level Program Memory Lock 256 x 8-bit Internal RAM 32 Programmable I/O Lines Three 16-bit Timer/Counters Eight Interrupt Sources Low Power Idle and Power Down Modes Description The AT89C55 is a low-power, high-performance CMOS 8-bit microcomputer with 20K bytes of Flash programmable and erasable read only memory. The device is manufactured using Atmel’s high density nonvolatile memory technology and is compatible with the industry standard 80C51 instruction set and pinout. The on-chip Flash allows the program memory to be reprogrammed in-system or by a conventional n [ ... ]

89C55 PDF Datasheet Download