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 ...)
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