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HT66F019 Datasheet(PDF) 155 Page - Holtek Semiconductor Inc |
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HT66F019 Datasheet(HTML) 155 Page - Holtek Semiconductor Inc |
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155 / 175 page  Rev. 1.00 154 De�e��e� 01� �01� Rev. 1.00 155 De�e��e� 01� �01� HT66F019 A/D Flash MCU with EEPROM HT66F019 A/D Flash MCU with EEPROM LVD Interrupt TheLowVoltageDetectorInterruptiscontainedwithintheMulti-functionInterrupt.ALVD InterruptrequestwilltakeplacewhentheLVDInterruptrequestflag,LVF,isset,whichoccurs whentheLowVoltageDetectorfunctiondetectsalowpowersupplyvoltage.Toallowtheprogram tobranchtoitsrespectiveinterruptvectoraddress,theglobalinterruptenablebit,EMI,LowVoltage Interruptenablebit,LVE,andassociatedMulti-functioninterruptenablebit,mustfirstbeset.When theinterruptisenabled,thestackisnotfullandalowvoltageconditionoccurs,asubroutinecallto theMulti-functionInterruptvector,willtakeplace.WhentheLowVoltageInterruptisserviced,the EMIbitwillbeautomaticallyclearedtodisableotherinterrupts,howeveronlytheMulti-function interruptrequestflagwillbealsoautomaticallycleared.AstheLVFflagwillnotbeautomatically cleared,ithastobeclearedbytheapplicationprogram. TM Interrupts TheCompact,StandardandPeriodicTMshavetwointerrupts,onecomesfromthecomparatorA matchsituationandtheothercomesfromthecomparatorPmatchsituation.AlloftheTMinterrupts arecontainedwithintheMulti-functionInterrupts.ForalloftheTMtypestherearetwointerrupt requestflagsandtwoenablecontrolbits.ATMinterruptrequestwilltakeplacewhenanyofthe TMrequestflagsareset,asituationwhichoccurswhenaTMcomparatorPorAmatchsituation happens. Toallowtheprogramtobranchtoitsrespectiveinterruptvectoraddress,theglobalinterruptenable bit,EMI,respectiveTMInterruptenablebit,andrelevantMulti-functionInterruptenablebit,MFnE, mustfirstbeset.Whentheinterruptisenabled,thestackisnotfullandaTMcomparatormatch situationoccurs,asubroutinecalltotherelevantMulti-functionInterruptvectorlocations,willtake place.WhentheTMinterruptisserviced,theEMIbitwillbeautomaticallyclearedtodisableother interrupts.However,onlytherelatedMFnFflagwillbeautomaticallycleared.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. |
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