PIC16C54 PIC16C52-04I/SS pdf and datasheet

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PIC16C54  PIC16C52-04I/SS  pdf and datasheet:

12-bit wide instructions 8-bit wide data path Seven or eight special function hardware registers Two-level deep hardware stack Direct, indirect and relative addressing modes for  data and instructions
Peripheral Features: 8-bit real time clock/counter (TMR0) with 8-bit programmable prescaler Power-On Reset (POR) Device Reset Timer (DRT) Watchdog Timer (WDT) with its own on-chip RC oscillator for reliable operation Programmable code-protection Power saving SLEEP mode Selectable oscillator options: RC:Low-cost RC oscillator XT:Standard crystal/resonator HS:High-speed crystal/resonator