This part is a kind of semiconductor called ATMEGA48A.

Function of this product has 8-bit Microcontroller.

Manufacturers : Atmel

Image and pinout :

Some of the text within the PDF file :

ATmega48A/PA/88A/PA/168A/PA/328/P ATMEL 8-BIT MICROCONTROLLER WITH 4/8/16/32KBYTES IN-SYSTEM PROGRAMMABLE FLASH Features DATASHEET  High Performance, Low Power Atmel®AVR® 8-Bit Microcontroller Family  Advanced RISC Architecture ̶ 131 Powerful Instructions – Most Single Clock Cycle Execution ̶ 32 x 8 General Purpose Working Registers ̶ Fully Static Operation ̶ Up to 20 MIPS Throughput at 20MHz ̶ On-chip 2-cycle Multiplier  High Endurance Non-volatile Memory Segments ̶ 4/8/16/32KBytes of In-System Self-Programmable Flash program memory ̶ 256/512/512/1KBytes EEPROM ̶ 512/1K/1K/2KBytes Internal SRAM ̶ Write/Erase Cycles: 10,000 Flash/100,000 EEPROM ̶ Data retention: 20 years at 85C/100 years at 25C(1) ̶ Optional Boot Code Section with Independent Lock Bits �� [ ... ]

ATMEGA48A PDF Datasheet Download