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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT66F005 데이터시트(PDF) 92 Page - Holtek Semiconductor Inc |
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HT66F005 데이터시트(HTML) 92 Page - Holtek Semiconductor Inc |
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92 / 109 page  Rev. 1.30 9� ���i� ��� �01� Rev. 1.30 93 ���i� ��� �01� HT66F005/HT66F006 Cost-Effective A/D Flash MCU with EEPROM HT66F005/HT66F006 Cost-Effective A/D Flash MCU with EEPROM 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. |
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