PIC 16F84A

PIC16F84A   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 Direct, indirect and relative addressing modes Four interrupt sources: External RB0/INT pin TMR0 timer overflow PORTB<7:4> interrupt-on-change Data EEPROM write complete   Peripheral Features:   13 I/O pins with individual direction control High current sink/source for direct LED drive 25 mA sink max. per pin 25 mA source max. per pin TMR0: 8-bit timer/counter with 8-bit programmable prescaler