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DEVICE OVERVIEW

This document contains device specific information for the PIC12F635/PIC16F636/639 devices.

High-Performance RISC CPU:

? Only 35 instructions to learn:

- All single-cycle instructions except branches

? Operating speed:

- DC – 20 MHz oscillator/clock input

- DC – 200 ns instruction cycle

? Interrupt capability

? 8-level deep hardware stack

? Direct, Indirect and Relative Addressing modes

Special Microcontroller Features:

? Precision Internal Oscillator:

- Factory calibrated to ±1, typical

- Software selectable frequency range of 8 MHz to 125 kHz

- Software tunable

- Two-Speed Start-up mode

- Crystal fail detect for critical applications

- Clock mode switching during operation for power savings

? Clock mode switching for low-power operation

? Power-Saving Sleep mode

? Wide operating voltage range (2.0V-5.5V)

? Industrial and Extended Temperature range

? Power-on Reset (POR)

? Wake-up Reset (WUR)

? Independent weak pull-up/pull-down resistors

? Programmable Low-Voltage Detect (PLVD)

? Power-up Timer (PWRT) and Oscillator Start-up Timer (OST)

? Brown-out Reset (BOR) with software control option

? Enhanced Low-Current Watchdog Timer (WDT) with on-chip oscillator (software selectable nominal 268 seconds with full prescaler) with software enable

? Multiplexed Master Clear with pull-up/input pin

? Programmable code protection (program and data independent)

? High-Endurance Flash/EEPROM cell:

- 100,000 write Flash endurance

- 1,000,000 write EEPROM endurance

- Flash/Data EEPROM Retention: > 40 years

Low-Power Features:

? Standby Current:

- 1 nA @ 2.0V, typical

? Operating Current:

- 8.5 μA @ 32 kHz, 2.0V, typical

- 100 μA @ 1 MHz, 2.0V, typical

? Watchdog Timer Current:

- 1 μA @ 2.0V, typical (Continue ...)