KEELOQ®曼彻斯特编码接收例程
AllKEELOQEncodersuseacommoncodewordformat.
Theyallpackthebitsofinformationinthesamenum-
berandpositioninthetransmissionsequence.While
alltheencodersofferabasicPulse-WidthModulation
(PWM)methodtoproduceasignalthatissuitablefor
radiotransmission,manyAdvancedKEELOQEncoders
(HCS360andhigher)offeralternativemethods.One
suchalternativemethodisManchesterencoding.This
TechnicalBriefshowsPIC
®
microcontrollers(MCUs)
assemblyroutinestoreceiveManchesterencoded
transmissions.TB045KEELOQManchesterEncodingReceiveRoutinesAManchesterencodedsignalcontainsfrequentlevelAuthors:LucioDiJasiotransitionswhichallowthereceivertoextracttheclockMicrochipTechnologyInc.signaleasilyandreliably.Thepenaltyforintroducingfrequenttransitions,isthattheManchestercodedsig-nalconsumesmorebandwidththantheoriginalsignalOVERVIEW
