标签: pic16c57

ThisdocumentdescribesaPIC16C57basedcodehoppingautomotivesecuritysystem.Thesecuritysys-temimplementsallthebasicfeaturesfoundonsecuritysystemsandcanbechangedtomodifyoraddfeaturesasrequired.ThecodecanalsobemovedtoahigherfunctionalityPIC®microcontrollerformoreI/Oorcodespace.AN645PIC16C57BasedCodeHoppingSecuritySystemAuthor:KobusMarneweckPINOUTMicrochipTechnologyInc.U1OVERVIEWT0CKIVDD1228……

ThePIC16C54C/55A/56A/57C/58B(Rev.ASiliconONLY)partsyouhavereceivedconformfunctionallytothePIC16C5XDeviceDataSheet(DS30453D),exceptfortheanomaliesdescribedbelow.AlltheproblemslistedherewillbeaddressedinfuturerevisionsofthePIC16C54C/55A/56A/57C/58Bsilicon.PIC16C54C/55A/56A/57C/58BPIC16C54C/55A/56A/57C/58B(Rev.ASilicon)ErrataSheetThePIC16C54C/55A/56A/57C/58B(Rev.ASiliconIftheminimumspecificationcannotbemet,thenanONLY)partsyouhavereceivedconformfunctionallytoexternalcircuitmustbeusedtoensurethatanypulsethePIC16C5XDeviceDataSheet(DS30453D),exceptwidth,lessthanthespecification,willbefilteredbeforefortheanomaliesdescribedbelow.itreachestheMCLRpin.AlltheproblemslistedherewillbeaddressedinfutureWorkaroundrevisionsofthePIC16C54C/55A/56A/57C/58Bsilicon.ApossiblecircuitisshowninFigure1.Properdesign……