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HT45F75 Datasheet(PDF) 157 Page - Holtek Semiconductor Inc |
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HT45F75 Datasheet(HTML) 157 Page - Holtek Semiconductor Inc |
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157 / 190 page  Rev. 1.10 15� De�e��e� 1�� �01� Rev. 1.10 157 De�e��e� 1�� �01� HT45F75 Body Fat Scale Flash MCU HT45F75 Body Fat Scale Flash MCU Interrupt Wake-up Function Eachoftheinterruptfunctionshasthecapabilityofwakingupthemicrocontrollerwheninthe SLEEPorIDLEMode.Awake-upisgeneratedwhenaninterruptrequestflagchangesfromlowto highandisindependentofwhethertheinterruptisenabledornot.Therefore,eventhoughthedevice isintheSLEEPorIDLEModeanditssystemoscillatorstopped,situationssuchasexternaledge transitionsontheexternalinterruptpinsoralowpowersupplyvoltagemaycausetheirrespective interruptflagtobesethighandconsequentlygenerateaninterrupt.Caremustthereforebetakenif spuriouswake-upsituationsaretobeavoided.Ifaninterruptwake-upfunctionistobedisabledthen thecorrespondinginterruptrequestflagshouldbesethighbeforethedeviceenterstheSLEEPor IDLEMode.Theinterruptenablebitshavenoeffectontheinterruptwake-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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