Freescale单片机_BDM调试方法及工具

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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！！！HostPCRS232RxDTxDGNDInterfacePodCustomBDMSerialTargetSystemBKGDunused(Vpp)GNDVddRESETBKGDNCNCGNDVddRESETBKGDNCNCGNDVddRESET要求BDM和目标板都改，会与Motorola原始定义不兼容，可通过跳线解决S12DG128BasedBDMToolUseBDMToolDebugS12TargetSystemUSB接口的BDMforS12调试工具BKGDPinShares3Funct

8、ionsModeSelectduringresetSelectsNormal(BKGD=1)orSpecial(BKGD=0)modesDuringR