This document describes a secure transponder sys -
tem. The system is suitable for use in security applica -
tions such as cars, motor bikes, and scooters (two-
whe elers). Microchip’s secure HCS410 KEEL OQ
®
code
hopping transponder is used. The decoder is imple -
mented on a Microchip PIC16C56 microcontroller. The
software can be used to implement a stand-alone
decoder or can be integrated into a security system.
The maximum operating range of this particular appli -
cation circuit is 25 millimeters (one inch). AN675
KEELOQ HCS410 Transponder Decoder Using a PIC16C56
Authors: Vivien Delport, Mike Sonnabend PIN FUNCTIONSD
Microchip Technology Inc.
INTRODUCTION LRN_IN 1 18 NC
LRN_OUT 2 17 IMMOB
This document describes a secure transponder sys-
tem. The system is suitable for use in security applica- NC 3 16 OSC_IN
tions such as cars, motor bikes, and scooters (two-
wheelers). Microchip’s secure HCS410 KEELOQ code
PIC16……
