This application note describes how to implement a
KEELOQ stand-alone programmer using a Microchip
PIC16F84A microcontroller.
The PIC16F84A is a FLASH microcontroller with 64
bytes of internal EEPROM that, in this design, is used
to store the incremental serial number programmed
into HCS encoders every time. All the other HCS con-
figuration parameters are defined as constants in the
FLASH program memory of the PIC16F84A. AN217
KEELOQ HCS30X, HCS200 Stand-Alone Programmer
KEELOQ SIMPLE LEARNING SCHEME
Author: Maurizio Fiammeni
Microchip Technology Inc. (Fixed Key)
This learning scheme implements the lowest level of
OVERVIEW security for a KEELOQ based security system. With this
method, every programmed encoder has a different
This application note describes how to implement a serial number, but the same fixed Encryption Key is
KEELOQ stand-alone programmer u……
