GENERAL DESCRIPTION
The PIC16C55X are 18, 20 and 28-Pin EPROM-based members of the versatile PIC16CXX family of low cost, high performance, CMOS, fully-static, 8-bit microcontrollers.

Devices Included in this Data Sheet:
Referred to collectively as PIC16C55X.
• PIC16C554
• PIC16C557
• PIC16C558

High Performance RISC CPU:
• Only 35 instructions to learn
• All single-cycle instructions (200 ns), except for program branches which are two-cycle
• Operating speed:
  - DC - 20 MHz clock input
  - DC - 20 ns instruction cycle
• Interrupt capability
• 16-18 special function hardware registers
• 8-level deep hardware stack
• Direct, Indirect and Relative Addressing modes

Peripheral Features:
• 13-22 I/O pins with individual direction control
  - Pull-up resistors on PORTB
• High current sink/source for direct LED drive
• Timer0: 8-bit timer/counter with 8-bit programmable prescaler

Special Microcontroller Features:
• Power-on Reset (POR)
• Power-up Timer (PWRT) and Oscillator Start-up Timer (OST)
• Watchdog Timer (WDT) with its own on-chip RC oscillator for reliable operation
• Programmable code protection
• Power saving SLEEP mode
• Selectable oscillator options
• Serial in-circuit programming (via two pins)
• Four user programmable ID locations

CMOS Technology:
• Low power, high speed CMOS EPROM technology
• Fully static design
• Wide operating voltage range
  - 2.5V to 5.5V
• Commercial, Industrial and Extended temperature range
• Low power consumption
  - < 2.0 mA @ 5.0V, 4.0 MHz
  - 15 A typical 3.0V, 32 kHz
  - < 1.0 A typical standby current @ 3.0V