This part is a kind of semiconductor called ATTINY84A.

Function of this product has 8-bit Microcontroller.

Manufacturers : ATMEL

Image and pinout :

Some of the text within the PDF file :

Features • High Performance, Low Power AVR® 8-bit Microcontroller • Advanced RISC Architecture – 120 Powerful Instructions – Most Single Clock Cycle Execution – 32 x 8 General Purpose Working Registers – Fully Static Operation • High Endurance, Non-volatile Memory Segments – 2K/4K/8K Bytes of In-System, Self-programmable Flash Program Memory • Endurance: 10,000 Write/Erase Cycles – 128/256/512 Bytes of In-System Programmable EEPROM • Endurance: 100,000 Write/Erase Cycles – 128/256/512 Bytes of Internal SRAM – Data Retention: 20 years at 85°C / 100 years at 25°C – Programming Lock for Self-programming Flash & EEPROM Data Security • Peripheral Features – One 8-bit and One 16-bit Timer/Counter with Two PWM Channels, Each – 10-bit ADC • 8 Single-ended Cha [ ... ]

ATTINY84A PDF Datasheet Download