KEELOQ与XTEA基于微控制器的发射器与应答

Thisapplicationnotedescribesthedesignofa

microcontroller-basedKEELOQ

®

Hoppingtransmitter

withreceiveracknowledgeusingtheXTEAencryption

algorithm.Thistransmitterisimplementedonthe

MicrochipPIC16F636microcontroller.Descriptionsof

theencodingprocess,theencodinghardwareand

descriptionofthesoftwaremodulesareincludedwithin

thisapplicationnote.Thesoftwarewasdesignedto

emulateanHCS365dualtransmitter.Thisdesigncan

beusedtoimplementasecuresystemtransmitterthat

hastheflexibilitytobedesignedintovarioustypesof

KEELOQreceiver/decoders.Theacknowledgeis

achievedbyusinganMRF49XAtransceiver.AN1328KEELOQwithXTEAMicrocontroller-BasedTransmitterwithAcknowledgeOperationAuthor:CristianTomaMicrochipTechnologyInc.2.0-5.5VoperationFour-buttoninputsAutomaticpacketretryfeatureINTRODUCTIONNonvolatilesynchronizationdataThisapplicationnotedescribesthedesignofaFSKmodulation(handledinternallybythemicrocontroller-basedKEELOQHoppingtransmitterMRF49XA)