DEVICE OVERVIEW

This document contains device specific information for the operation of the PIC16F84A device. Additional information may be found in the PICmicro™ Mid Range Reference Manual, (DS33023), which may be downloaded from the Microchip website. The Refer ence Manual should be considered a complementary document to this data sheet, and is highly recom mended reading for a better understanding of the device architecture and operation of the peripheral modules.

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



Special Microcontroller Features:

• 10,000 erase/write cycles Enhanced FLASH Program memory typical

• 10,000,000 typical erase/write cycles EEPROM Data memory typical

• EEPROM Data Retention > 40 years

• In-Circuit Serial Programming™ (ICSP™) - via two pins

• Power-on Reset (POR), Power-up Timer (PWRT), Oscillator Start-up Timer (OST)

• Watchdog Timer (WDT) with its own On-Chip RC Oscillator for reliable operation

• Code protection

• Power saving SLEEP mode

• Selectable oscillator options