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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 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