GENERAL DESCRIPTION
The PIC16F627A/628A/648A are 18-pin Flash-based members of the versatile PIC16F627A/628A/648A family of low-cost, high-performance, CMOS, fullystatic, 8-bit microcontrollers.
All PIC® microcontrollers employ an advanced RISC architecture. The PIC16F627A/628A/648A have enhanced core features, an eight-level deep stack, and multiple internal and external interrupt sources. The separate instruction and data buses of the Harvard architecture allow a 14-bit wide instruction word with the separate 8-bit wide data. The two-stage instruction pipeline allows all instructions to execute in a singlecycle, except for program branches (which require two cycles). A total of 35 instructions (reduced instruction set) are available, complemented by a large register set.

High-Performance RISC CPU:
• Operating speeds from DC – 20 MHz
• Interrupt capability
• 8-level deep hardware stack
• Direct, Indirect and Relative Addressing modes
• 35 single-word instructions:
   - All instructions single cycle except branches

Special Microcontroller Features:
• Internal and external oscillator options:
   - Precision internal 4 MHz oscillator factory
   calibrated to ±1%
   - Low-power internal 48 kHz oscillator
   - External Oscillator support for crystals and
   resonators
• Power-saving Sleep mode
• Programmable weak pull-ups on PORTB
• Multiplexed Master Clear/Input-pin
• Watchdog Timer with independent oscillator for
   reliable operation
• Low-voltage programming
• In-Circuit Serial Programming™ (via two pins)
• Programmable code protection
• Brown-out Reset
• Power-on Reset
• Power-up Timer and Oscillator Start-up Timer
• Wide operating voltage range (2.0-5.5V)
• Industrial and extended temperature range
• High-Endurance Flash/EEPROM cell:
   - 100,000 write Flash endurance
   - 1,000,000 write EEPROM endurance
   - 40 year data retention