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HT45R4U Datasheet(PDF) 26 Page - Holtek Semiconductor Inc |
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HT45R4U Datasheet(HTML) 26 Page - Holtek Semiconductor Inc |
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26 / 105 page  Rev. 1.10 �6 �a��� 1�� �01� Rev. 1.10 �7 �a��� 1�� �01� HT45R4U TinyPowerTM A/D Type e-Banking ASSP OTP MCU with LCD Program Counter Low Register − PCL Toprovideadditionalprogramcontrolfunctions,thelowbyteoftheProgramCounterismade accessibletoprogrammersbylocatingitwithintheSpecialPurposeareaoftheDataMemory.By manipulatingthisregister,directjumpstootherprogramlocationsareeasilyimplemented.Loading avaluedirectlyintothisPCLregisterwillcauseajumptothespecifiedProgramMemorylocation, however,astheregisterisonly8-bitwide,onlyjumpswithinthecurrentProgramMemorypageare permitted.Whensuchoperationsareused,notethatadummycyclewillbeinserted. Look-up Table Registers − TBLP, TBHP, TBLH Thesethreespecialfunctionregistersareusedtocontroloperationofthelook-uptablewhichis storedintheProgramMemory.TheTBLPandTBHPregistersarethelowerorderbyteandhigh orderbytetablepointersandindicatesthelocationwherethetabledataislocated.Theirvaluemust besetupbeforeanytablereadcommandsareexecuted.Theirvaluecanbechanged,forexample usingthe"INC"or"DEC"instructions,allowingforeasytabledatapointingandreading.TBLHis thelocationwherethehighorderbyteofthetabledataisstoredafteratablereaddatainstruction hasbeenexecuted.Notethatthelowerordertabledatabyteistransferredtoauserdefinedlocation. Status Register − STATUS This8-bitregistercontainsthezeroflag(Z),carryflag(C),auxiliarycarryflag(AC),overflowflag (OV),powerdownflag(PDF),andwatchdogtime-outflag(TO).Thesearithmetic/logicaloperation andsystemmanagementflagsareusedtorecordthestatusandoperationofthemicrocontroller. WiththeexceptionoftheTOandPDFflags,bitsinthestatusregistercanbealteredbyinstructions likemostotherregisters.AnydatawrittenintothestatusregisterwillnotchangetheTOorPDFflag. Inaddition,operationsrelatedtothestatusregistermaygivedifferentresultsduetothedifferent instructionoperations.TheTOflagcanbeaffectedonlybyasystempower-up,aWDTtime-outor byexecutingthe″CLRWDT″or″HALT″instruction.ThePDFflagisaffectedonlybyexecuting the″HALT″or″CLRWDT″instructionorduringasystempower-up. TheZ,OV,ACandCflagsgenerallyreflectthestatusofthelatestoperations. • Cissetifanoperationresultsinacarryduringanadditionoperationorifaborrowdoesnottake placeduringasubtractionoperation;otherwiseCiscleared.Cisalsoaffectedbyarotatethrough carryinstruction. • ACissetifanoperationresultsinacarryoutofthelownibblesinaddition,ornoborrowfrom thehighnibbleintothelownibbleinsubtraction;otherwiseACiscleared. • Zissetiftheresultofanarithmeticorlogicaloperationiszero;otherwiseZiscleared. • OVissetifanoperationresultsinacarryintothehighest-orderbitbutnotacarryoutofthe highest-orderbit,orviceversa;otherwiseOViscleared. • PDFisclearedbyasystempower-uporexecutingthe″CLRWDT″instruction.PDFissetby executingthe″HALT″instruction. • TOisclearedbyasystempower-uporexecutingthe″CLRWDT″or″HALT″instruction.TOis setbyaWDTtime-out. Inaddition,onenteringaninterruptsequenceorexecutingasubroutinecall,thestatusregisterwill notbepushedontothestackautomatically.Ifthecontentsofthestatusregistersareimportantandif thesubroutinecancorruptthestatusregister,precautionsmustbetakentocorrectlysaveit. |
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