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HT45F4MA Datasheet(PDF) 124 Page - Holtek Semiconductor Inc |
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HT45F4MA Datasheet(HTML) 124 Page - Holtek Semiconductor Inc |
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124 / 145 page  Rev. 1.20 12� De�e��e� 1�� 201� Rev. 1.20 125 De�e��e� 1�� 201� HT45F4MA/HT45FH4MA/HT45FH4MA-1 Power Bank Flash MCU HT45F4MA/HT45FH4MA/HT45FH4MA-1 Power Bank 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~MF2F,will beautomaticallycleared,theindividualrequestflagforthefunctionneedstobeclearedbythe applicationprogram. Itisrecommendedthatprogramsdonotusethe“CALL”instructionwithintheinterruptservice subroutine.Interruptsoftenoccurinanunpredictablemannerorneedtobeservicedimmediately. Ifonlyonestackisleftandtheinterruptisnotwellcontrolled,theoriginalcontrolsequencewillbe damagedonceaCALLsubroutineisexecutedintheinterruptsubroutine. EveryinterrupthasthecapabilityofwakingupthemicrocontrollerwhenitisinSLEEPorIDLE Mode,thewakeupbeinggeneratedwhentheinterruptrequestflagchangesfromlowtohigh.Ifitis requiredtopreventacertaininterruptfromwakingupthemicrocontrollerthenitsrespectiverequest flagshouldbefirstsethighbeforeenterSLEEPorIDLEMode. AsonlytheProgramCounterispushedontothestack,thenwhentheinterruptisserviced,ifthe contentsoftheaccumulator,statusregisterorotherregistersarealteredbytheinterruptservice program,theircontentsshouldbesavedtothememoryatthebeginningoftheinterruptserviceroutine. Toreturnfromaninterruptsubroutine,eitheraRETorRETIinstructionmaybeexecuted.TheRETI instructioninadditiontoexecutingareturntothemainprogramalsoautomaticallysetstheEMI bithightoallowfurtherinterrupts.TheRETinstructionhoweveronlyexecutesareturntothemain programleavingtheEMIbitinitspresentzerostateandthereforedisablingtheexecutionoffurther interrupts. |
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