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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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HT45F2002 Datasheet(PDF) 16 Page - Holtek Semiconductor Inc |
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HT45F2002 Datasheet(HTML) 16 Page - Holtek Semiconductor Inc |
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16 / 31 page  Rev. 1.00 1� ���� 1�� �01� Rev. 1.00 17 ���� 1�� �01� HT45F2002 2-Wire Communication Flash MCU HT45F2002 2-Wire Communication Flash MCU 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.MakinguseofseveralkindsofMOVinstructions,datacanbetransferredfromregisters totheAccumulatorandvice-versaaswellasbeingabletomovespecificimmediatedatadirectly intotheAccumulator.Oneofthemostimportantdatatransferapplicationsistoreceivedatafrom theinputportsandtransferdatatotheoutputports. Arithmetic Operations Theabilitytoperformcertainarithmeticoperationsanddatamanipulationisanecessaryfeatureof mostmicrocontrollerapplications.WithintheHoltekmicrocontrollerinstructionsetarearangeof addandsubtractinstructionmnemonicstoenablethenecessaryarithmetictobecarriedout.Care mustbetakentoensurecorrecthandlingofcarryandborrowdatawhenresultsexceed255for additionandlessthan0forsubtraction.TheincrementanddecrementinstructionssuchasINC, INCA,DECandDECAprovideasimplemeansofincreasingordecreasingbyavalueofoneofthe valuesinthedestinationspecified. |
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