DEVICE OVERVIEW
The PIC16F631/677/685/687/689/690 devices are covered by this data sheet. They are available in 20-pin PDIP, SOIC, TSSOP and QFN packages.

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 32 kHz
   - Software tunable
   - Two-Speed Start-up mode
   - Crystal fail detect for critical applications
   - Clock mode switching during operation for power savings
• Power-Saving Sleep mode
• Wide Operating Voltage Range (2.0V-5.5V)
• Industrial and Extended Temperature Range
• Power-on Reset (POR)
• Power-up Timer (PWRTE) 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/Input Pin
• Programmable Code Protection
• High Endurance Flash/EEPROM Cell:
   - 100,000 write Flash endurance
   - 1,000,000 write EEPROM endurance
   - Flash/Data EEPROM retention: > 40 years
• Enhanced USART Module:
   - Supports RS-485, RS-232 and LIN 2.0
   - Auto-Baud Detect
   - Auto-wake-up on Start bit
  
Low-Power Features:
• Standby Current:
   - 50 nA @ 2.0V, typical
• Operating Current:
   - 11 μA @ 32 kHz, 2.0V, typical
   - 220 μA @ 4 MHz, 2.0V, typical
• Watchdog Timer Current:
   - <1 μA @ 2.0V, typical
  
Peripheral Features:
• 17 I/O Pins and 1 Input-Only Pin:
   - High current source/sink for direct LED drive
   - Interrupt-on-Change pin
   - Individually programmable weak pull-ups
   - Ultra Low-Power Wake-up (ULPWU)
• Analog Comparator Module with:
   - Two analog comparators
   - Programmable on-chip voltage reference (CVREF) module (% of VDD)
   - Comparator inputs and outputs externally accessible
   - SR Latch mode
   - Timer 1 Gate Sync Latch
   - Fixed 0.6V VREF
• A/D Converter:
   - 10-bit resolution and 12 channels
• Timer0: 8-bit Timer/Counter with 8-bit Programmable Prescaler
• Enhanced Timer1:
   - 16-bit timer/counter with prescaler
   - External Timer1 Gate (count enable)
   - Option to use OSC1 and OSC2 in LP mode as Timer1 oscillator if INTOSC mode selected
• Timer2: 8-bit Timer/Counter with 8-bit Period Register, Prescaler and Postscaler
• Enhanced Capture, Compare, PWM+ Module:
   - 16-bit Capture, max resolution 12.5 ns
   - Compare, max resolution 200 ns
   - 10-bit PWM with 1, 2 or 4 output channels, programmable “dead time”, max frequency 20 kHz
   - PWM output steering control
• Synchronous Serial Port (SSP):
   - SPI mode (Master and Slave)
• I2C™ (Master/Slave modes):
   - I2C™ address mask
• In-Circuit Serial ProgrammingTM (ICSPTM) via Two Pins