简单代码的KEELOQ跳解码器
Thisapplicationnotefullydescribestheworkingofa
codehoppingdecoderimplementedonaMicrochip
PIC16C54microcontroller.ThePIC16C54issmaller
thanthePIC16C56usedinthenormaldecoder
(AN642)orthesecurelearndecoder(AN652).Asim-
plifiedlearningschemewithallencoderssharinga
commonkeyandasimplifiedcountersynchronization
schemehasbeenusedtoreducethecodespace
requirements.Theuseofacommonkeyreducesthe
securityofthesystem.Thesimpledecodercanlearn
upto15encoders.Thisapplicationnotedescribesthe
variousKEELOQ
®
codehoppingencodersthatcanbe
usedwiththedecoder,thedecoderhardware,andthe
varioussoftwaremodulescomprisingthesystem.The
softwarecanbeusedtoimplementastandalone
decoderorintegratedwithfullfunctionsecuritysys-
tems.ThedecodersupportstheMicrochipHCS200,
HCS300,HCS301,HCS360,HCS361andHCS410
KEELOQCodeHoppingEncoders.AN663KEELOQSimpleCodeHoppingDecoderAuthor:StevenDawsonKEYFEATURESMicrochipTechnologyInc.PIC16C54OVERVIEWStandalonedecoderCompatiblewithMicrochipHCS200,HCS300,ThisapplicationnotefullydescribestheworkingofaHCS301,HCS360,HCS361andHCS410codehoppingdecoderimplementedonaMicrochipencodersPIC16C54microcontroller.ThePIC16C54issmallerAutomaticbitratedetectionthanthePIC16C56usedinthenormaldecoderAutomaticencodertypedetection(AN642)
