This part is a kind of semiconductor called ATTINY84.

Function of this product has (ATTINYx4) 8-bit Microcontroller.

Manufacturers : ATMEL Corporation

Image and pinout :

Some of the text within the PDF file :

ATtiny24/44/84 8-bit AVR Microcontroller with 2/4/8K Bytes In-System Programmable Flash DATASHEET 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 ● Non-volatile program and data memories ● 2/4/8K byte of in-system programmable program memory flash (Atmel® ATtiny24/44/84) ● Endurance: 10,000 write/erase cycles ● 128/256/512 bytes in-system programmable EEPROM (Atmel ATtiny24/44/84) ● Endurance: 100,000 write/erase cycles ● 128/256/512 bytes internal SRAM (Atmel ATtiny24/44/84) ● Programming lock for self-programming flash program and EEPROM data security ● Peripheral features ● Two T [ ... ]

ATTINY84 PDF Datasheet Download