HT45F65 datasheet(186/231 Pages) HOLTEK

186 / 231 page

Rev. 1.60

186

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Rev. 1.60

187

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HT45F65/HT45F66/HT45F67

Glucose Meter 8-Bit Flash MCU

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,MF0F~MF3F,will

beautomaticallycleared,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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