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HT45R4U датащи(PDF) 90 Page - Holtek Semiconductor Inc |
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HT45R4U датащи(HTML) 90 Page - Holtek Semiconductor Inc |
90 / 105 page Rev. 1.10 90 �a��� 1�� �01� Rev. 1.10 91 �a��� 1�� �01� HT45R4U TinyPowerTM A/D Type e-Banking ASSP OTP MCU with LCD Instruction Set Introduction Centraltothesuccessfuloperationofanymicrocontrollerisitsinstructionset,whichisasetof programinstructioncodesthatdirectsthemicrocontrollertoperformcertainoperations.Inthecase ofHoltekmicrocontroller,acomprehensiveandflexiblesetofover60instructionsisprovidedto enableprogrammerstoimplementtheirapplicationwiththeminimumofprogrammingoverheads. Foreasierunderstandingofthevariousinstructioncodes,theyhavebeensubdividedintoseveral functionalgroupings. Instruction Timing Mostinstructionsareimplementedwithinoneinstructioncycle.Theexceptionstothisarebranch, call,ortablereadinstructionswheretwoinstructioncyclesarerequired.Oneinstructioncycleis equalto4systemclockcycles,thereforeinthecaseofan8MHzsystemoscillator,mostinstructions wouldbeimplementedwithin0.5μsandbranchorcallinstructionswouldbeimplementedwithin 1μs.Althoughinstructionswhichrequireonemorecycletoimplementaregenerallylimitedto theJMP,CALL,RET,RETIandtablereadinstructions,itisimportanttorealizethatanyother instructionswhichinvolvemanipulationoftheProgramCounterLowregisterorPCLwillalsotake onemorecycletoimplement.AsinstructionswhichchangethecontentsofthePCLwillimplya directjumptothatnewaddress,onemorecyclewillberequired.Examplesofsuchinstructions wouldbe"CLRPCL"or"MOVPCL,A".Forthecaseofskipinstructions,itmustbenotedthatif theresultofthecomparisoninvolvesaskipoperationthenthiswillalsotakeonemorecycle,ifno skipisinvolvedthenonlyonecycleisrequired. Moving and Transferring Data Thetransferofdatawithinthemicrocontrollerprogramisoneofthemostfrequentlyused operations.MakinguseofthreekindsofMOVinstructions,datacanbetransferredfromregistersto theAccumulatorandvice-versaaswellasbeingabletomovespecificimmediatedatadirectlyinto theAccumulator.Oneofthemostimportantdatatransferapplicationsistoreceivedatafromthe inputportsandtransferdatatotheoutputports. Arithmetic Operations Theabilitytoperformcertainarithmeticoperationsanddatamanipulationisanecessaryfeatureof mostmicrocontrollerapplications.WithintheHoltekmicrocontrollerinstructionsetarearangeof addandsubtractinstructionmnemonicstoenablethenecessaryarithmetictobecarriedout.Care mustbetakentoensurecorrecthandlingofcarryandborrowdatawhenresultsexceed255for additionandlessthan0forsubtraction.TheincrementanddecrementinstructionsINC,INCA,DEC andDECAprovideasimplemeansofincreasingordecreasingbyavalueofoneofthevaluesinthe destinationspecified. |
Аналогичный номер детали - HT45R4U |
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Аналогичное описание - HT45R4U |
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