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1、S12MicroControllerDebugModule&BDMToolsDebugModeFeatures:Single-WireInterface.ActiveoutofResetinSpecialSingle-ChipModeInstructionTaggingCapabilityAllowsforsystemdebuggingduringprogramexecution.CanaccessallCPUregistersandsystemmemory.IPIPE0IPIPE1BKGDSingleWireSerialSystem16-BI
2、TSHIFTREGISTERInstructionDecode&Execution256BYTE@$FF00MEMADDRDATACNTLBusInt.&ControlHCS121wirecommunicationBDMHost-to-TargetSerialBitTimingWriteOneTimeslotWriteZeroTimeslotReadDataWriteaByteinRegisterBto1woreBusCLSLB0BCCWRITE0orBCSWRITE1WriteaByteinRegisterBtoBKGDWRITEBYTELD
3、AA#$8;BitnumberNEXTBITLSLB;HighbittoCBCCWRITE0BCLRBDMPORT,BKGD;Write1,DDR=OUTPTSEI;DisableIRQBSETBDMDDR,BKGD;0NOPBSETBDMPORT,BKGD;to1NEXTBIT1BCLRBDMDDR,BKGD;3cycles,DDR=InputCLI;EnableIRQDECA;1bitsentBNENEXTBITWAIT10RTS;5CyclesWRITE0BSETBDMDDR,BKGD;DDR=OutputSEIBCLRBDMPORT,B
4、DMBIT;Output=0BSRWAIT10;5+4cyclesNOPBRANEXBIT1;3cyclesModifyPage197BackgroundDebugModeOnceenabled,backgroundmodecanbemadeactivebyaserialcommandsentviatheBKGDpinorexecutionofaCPU12BGNDinstruction.TheCPUexecutescodelocatedinasmallon-chipROMmappedtoaddresses$FF20to$FFFF,replace
5、stheregularsystemvectors.BDMcontrolregistersareat$FF00to$FF06.Theusermemoryfrom$FF00to$FFFFisnotinthemapexceptthroughserialBDMcommands.HCS12TargetSystemBDMInterfacePodProgramExecutionBackgroundMonitorCodeCommandsResponsesBreakpointorBGNDInstructionReturntomainprogramexecutio
6、nBKGDPINSDIBackgroundDebugModeHostPCVIEW/MODIFYREGISTERS&MEMORYetc.SingleWireDevelopmentInterfaceTypicalBDMSystemOnlyBKGDandGNDarerequired,othersareoptional.-Resetwouldallowhosttoresetthetargetsystem.-Vddwouldallowpodto“steal”powerfromthetargetsystem.Vppisnotneededinanycurre
7、ntHCS12systems.注意：一定不能插反！?。ostPCRS232RxDTxDGNDInterfacePodCustomBDMSerialTargetSystemBKGDunused(Vpp)GNDVddRESETBKGDNCNCGNDVddRESETBKGDNCNCGNDVddRESET要求BDM和目標板都改，會與Motorola原始定義不兼容，可通過跳線解決S12DG128BasedBDMToolUseBDMToolDebugS12TargetSystemUSB接口的BDMforS12調(diào)試工具BKGDPinShares3Funct
8、ionsModeSelectduringresetSelectsNormal(BKGD=1)orSpecial(BKGD=0)modesDuringR
