HT45F56 datasheet(75/90 Pages) HOLTEK

75 / 90 page

Rev. 1.11

April 11, 2017

Rev. 1.11

April 11, 2017

HT45F56

Shock Detector Flash MCU

HT45F56

Shock Detector 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.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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