PIC16C50X Datasheet - Microchip Technology

PROGRAMMING THE PIC16C50X
   The PIC16C50X can be programmed using a serial method. Due to this serial programming, the PIC16C50X can be programmed while in the user’s system, increasing design flexibility. This programming specification applies to PIC16C50X devices in all packages.

Hardware Requirements 
   The PIC16C50X requires two programmable power supplies, one for VDD (2.0V to 6.5V recommended) and one for VPP (12V to 14V). Both supplies should have a minimum resolution of 0.25V.

Programming Mode
   The Programming mode for the PIC16C50X allows programming of user program memory, and the configuration word for the PIC16C50X.