This part is a kind of semiconductor called 16F84A.

Function of this product has 18-pin Enhanced Flash/EEPROM 8-Bit Microcontroller.

Manufacturers : Microchip Technology

Image and pinout :

Some of the text within the PDF file :

M PIC16F84A Pin Diagrams PDIP, SOIC RA2 RA3 RA4/T0CKI MCLR VSS RB0/INT RB1 RB2 RB3 •1 18-pin Enhanced Flash/EEPROM 8-Bit Microcontroller Devices Included in this Data Sheet: • PIC16F84A • Extended voltage range device available (PIC16LF84A) 18 17 16 15 14 13 12 11 10 RA1 RA0 OSC1/CLKIN OSC2/CLKOUT VDD RB7 RB6 RB5 RB4 High Performance RISC CPU Features: • Only 35 single word instructions to learn • All instructions single cycle except for program branches which are two-cycle • Operating speed: DC - 20 MHz clock input DC - 200 ns instruction cycle • 1024 words of program memory • 68 bytes of data RAM • 64 bytes of data EEPROM • 14-bit wide instruction words • 8-bit wide data bytes • 15 special function hardware registers • Eight-level deep hardware stack • D [ ... ]

16F84A PDF Datasheet Download