
PIC12F635/PIC16F636/639

8/14-Pin Flash-Based, 8-Bit CMOS Microcontrollers
With nanoWatt Technology

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%
  - Software selectable frequency range of
    8 MHz to 31 kHz
  - Software tunable
  - Two-Speed Start-up mode
  - Crystal fail detect for critical applications
• 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 Detect (BOD) 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:
  - 8.5µA @ 32 kHz, 2.0V, typical
  - 100µA @ 1 MHz, 2.0V, typical
• Watchdog Timer Current:
  - 1µA @ 2.0V, typical

Peripheral Features:

• 6/12 I/O pins with individual direction control:
  - High-current source/sink for direct LED drive
  - Interrupt-on-pin change
  - Individually programmable weak pull-ups/
    pull-downs
  - Ultra Low-Power Wake-up
• Analog comparator module with:
  - Up to two analog comparators
  - Programmable on-chip voltage reference
    (CVREF) module (% of VDD)
  - Comparator inputs and outputs externally
    accessible
• Timer0: 8-bit timer/counter with 8-bit
  programmable prescaler
• Enhanced Timer1:
  - 16-bit timer/counter with prescaler
  - External Gate Input mode
  - Option to use OSC1 and OSC2 in LP mode
    as Timer1 oscillator if INTOSC mode
    selected
• KEELOQ® compatible hardware Cryptographic
  module
• In-Circuit Serial ProgrammingTM (ICSPTM) via
  two pins

Low Frequency Analog Front-End Features
(PIC16F639 only):

• Three input pins for 125 kHz LF input signals
• High input detection sensitivity (3 mVPP, typical)
• Demodulated data, Carrier clock or RSSI output
  selection
• Input carrier frequency: 125 kHz, typical
• Input modulation frequency: 4 kHz, maximum
• 8 internal configuration registers
• Bidirectional transponder communication
  (LF talk back)
• Programmable antenna tuning capacitance
  (up to 63 pF, 1 pF/step)
• Low standby current: 5 µA (with 3 channels
  enabled), typical
• Low operating current: 15 µA (with 3 channels
  enabled), typical
• Serial Peripheral Interface (SPI™) with internal
  MCU and external devices
• Supports Battery Back-up mode and batteryless
  operation with external circuits
