HT67F5652 datasheet(182/224 Pages) HOLTEK

182 / 224 page

Rev. 1.00

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HT67F5652

24-Bit Delta Sigma A/D + LCD Flash MCU

HT67F5652

24-Bit Delta Sigma A/D + LCD Flash MCU

Toallowtheprogramtobranchtoitsrespectiveinterruptvectoraddress,theglobalinterruptenable

bit,EMI,respectiveTMInterruptenablebit,andrelevantMulti-functionInterruptenablebit,MFnE,

mustfirstbeset.Whentheinterruptisenabled,thestackisnotfullandaTMcomparatormatch

situationoccurs,asubroutinecalltotherelevantMulti-functionInterruptvectorlocations,willtake

place.WhentheTMinterruptisserviced,theEMIbitwillbeautomaticallyclearedtodisableother

interrupts,howeveronlytherelatedMFnFflagwillbeautomaticallycleared.AstheTMinterrupt

requestflagswillnotbeautomaticallycleared,theyhavetobeclearedbytheapplicationprogram.

Interrupt Wake-up Function

Eachoftheinterruptfunctionshasthecapabilityofwakingupthemicrocontrollerwheninthe

SLEEPorIDLEMode.Awake-upisgeneratedwhenaninterruptrequestflagchangesfromlowto

highandisindependentofwhethertheinterruptisenabledornot.Therefore,eventhoughthedevice

isintheSLEEPorIDLEModeanditssystemoscillatorstopped,situationssuchasexternaledge

transitionsontheexternalinterruptpins,alowpowersupplyvoltageorcomparatorinputchange

maycausetheirrespectiveinterruptflagtobesethighandconsequentlygenerateaninterrupt.Care

mustthereforebetakenifspuriouswake-upsituationsaretobeavoided.Ifaninterruptwake-up

functionistobedisabledthenthecorrespondinginterruptrequestflagshouldbesethighbeforethe

deviceenterstheSLEEPorIDLEMode.Theinterruptenablebitshavenoeffectontheinterrupt

wake-upfunction.

Programming Considerations

Bydisablingtherelevantinterruptenablebits,arequestedinterruptcanbepreventedfrombeing

serviced,however,onceaninterruptrequestflagisset,itwillremaininthisconditioninthe

interruptregisteruntilthecorrespondinginterruptisservicedoruntiltherequestflagisclearedby

theapplicationprogram.

WhereacertaininterruptiscontainedwithinaMulti-functioninterrupt,thenwhentheinterrupt

serviceroutineisexecuted,asonlytheMulti-functioninterruptrequestflags,MFnF,willbe

automaticallycleared,theindividualrequestflagforthefunctionneedstobeclearedbythe

applicationprogram.

Itisrecommendedthatprogramsdonotusethe"CALL"instructionwithintheinterruptservice

subroutine.Interruptsoftenoccurinanunpredictablemannerorneedtobeservicedimmediately.

Ifonlyonestackisleftandtheinterruptisnotwellcontrolled,theoriginalcontrolsequencewillbe

damagedonceaCALLsubroutineisexecutedintheinterruptsubroutine.

EveryinterrupthasthecapabilityofwakingupthemicrocontrollerwhenitisinSLEEPorIDLE

Mode,thewakeupbeinggeneratedwhentheinterruptrequestflagchangesfromlowtohigh.Ifitis

requiredtopreventacertaininterruptfromwakingupthemicrocontrollerthenitsrespectiverequest

flagshouldbefirstsethighbeforeenterSLEEPorIDLEMode.

AsonlytheProgramCounterispushedontothestack,thenwhentheinterruptisserviced,ifthe

contentsoftheaccumulator,statusregisterorotherregistersarealteredbytheinterruptservice

program,theircontentsshouldbesavedtothememoryatthebeginningoftheinterruptservice

routine.Toreturnfromaninterruptsubroutine,eitheraRETorRETIinstructionmaybeexecuted.

TheRETIinstructioninadditiontoexecutingareturntothemainprogramalsoautomaticallysets

theEMIbithightoallowfurtherinterrupts.TheRETinstructionhoweveronlyexecutesareturnto

themainprogramleavingtheEMIbitinitspresentzerostateandthereforedisablingtheexecution

offurtherinterrupts.

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