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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT45F3W 데이터시트(PDF) 131 Page - Holtek Semiconductor Inc |
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HT45F3W 데이터시트(HTML) 131 Page - Holtek Semiconductor Inc |
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131 / 167 page  Rev. 1.50 130 De�e��e� 01� �01� Rev. 1.50 131 De�e��e� 01� �01� HT45F3W R-Type Blood Pressure Meter Flash MCU HT45F3W R-Type Blood Pressure Meter Flash MCU Charge Pump Interrupt ThechargepumpInterrupt,iscontainedwithintheMulti-functionInterrupt.Toallowtheprogram tobranchtotheirrespectiveinterruptvectoraddresses,theglobalinterruptenablebit,EMI,multi- functionenablebit,MFnEandchargepumpinterruptenablebit,CHPE,mustfirstbeset.Whenthe interruptisenabled,thestackisnotfullandtheinputvoltageofchargepumpisgreaterthan3.8V,a subroutinecalltotherespectiveMulti-functionInterruptvector,willtakeplace.Whentheinterrupt isserviced,theEMIbitwillbeautomaticallyclearedtodisableotherinterrupts,howeveronlythe Multi-functioninterruptrequestflagwillbealsoautomaticallycleared. 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.TheRETI instructioninadditiontoexecutingareturntothemainprogramalsoautomaticallysetstheEMI bithightoallowfurtherinterrupts.TheRETinstructionhoweveronlyexecutesareturntothemain programleavingtheEMIbitinitspresentzerostateandthereforedisablingtheexecutionoffurther interrupts. |
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