HT66F006 datasheet(92/109 Pages) HOLTEK

92 / 109 page

Rev. 1.30

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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.

HT66F006 Datasheet(PDF) 92 Page - Holtek Semiconductor Inc

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