This part is a kind of semiconductor called AT89LP51RB2.

Function of this product has 8-bit Flash Microcontroller.

Manufacturers : ATMEL

Image and pinout :

Some of the text within the PDF file :

Features • 8-bit Microcontroller Compatible with 8051 Products • Enhanced 8051 Architecture – Single Clock Cycle per Byte Fetch – 12 Clock per Machine Cycle Compatibility Mode – Up to 20 MIPS Throughput at 20 MHz Clock Frequency – Fully Static Operation: 0 Hz to 20 MHz – On-chip 2-cycle Hardware Multiplier – 16x16 Multiply–Accumulate Unit – 256 x 8 Internal RAM – On-chip 1152 Bytes Expanded RAM (ERAM) • Software Selectable Size (0, 256, 512, 768, 1024 or 1152 Bytes) – Dual Data Pointers – 4-level Interrupt Priority • Nonvolatile Program and Data Memory – 24KB/32KB of In-System Programmable (ISP) Flash Program Memory – 512-byte User Signature Array – Endurance: 10,000 Write/Erase Cycles – Serial Interface for Program Downloading – 2KB Boot ROM Contain [ ... ]

AT89LP51RB2 PDF Datasheet Download