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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT45F75 데이터시트(PDF) 151 Page - Holtek Semiconductor Inc |
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HT45F75 데이터시트(HTML) 151 Page - Holtek Semiconductor Inc |
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151 / 190 page  Rev. 1.10 150 De�e��e� 1�� �01� Rev. 1.10 151 De�e��e� 1�� �01� HT45F75 Body Fat Scale Flash MCU HT45F75 Body Fat Scale Flash MCU Interrupt Operation Whentheconditionsforaninterrupteventoccur,suchasaTMComparatorP,ComparatorA matchorA/Dconversioncompletionetc.,therelevantinterruptrequestflagwillbeset.Whether therequestflagactuallygeneratesaprogramjumptotherelevantinterruptvectorisdeterminedby theconditionoftheinterruptenablebit.Iftheenablebitissethighthentheprogramwilljumpto itsrelevantvector;iftheenablebitiszerothenalthoughtheinterruptrequestflagissetanactual interruptwillnotbegeneratedandtheprogramwillnotjumptotherelevantinterruptvector.The globalinterruptenablebit,ifclearedtozero,willdisableallinterrupts. Whenaninterruptisgenerated,theProgramCounter,whichstorestheaddressofthenextinstruction tobeexecuted,willbetransferredontothestack.TheProgramCounterwillthenbeloadedwitha newaddresswhichwillbethevalueofthecorrespondinginterruptvector.Themicrocontrollerwill thenfetchitsnextinstructionfromthisinterruptvector.Theinstructionatthisvectorwillusually bea“JMP”whichwilljumptoanothersectionofprogramwhichisknownastheinterruptservice routine.Hereislocatedthecodetocontroltheappropriateinterrupt.Theinterruptserviceroutine mustbeterminatedwitha“RETI”,whichretrievestheoriginalProgramCounteraddressfrom thestackandallowsthemicrocontrollertocontinuewithnormalexecutionatthepointwherethe interruptoccurred. Thevariousinterruptenablebits,togetherwiththeirassociatedrequestflags,areshowninthe accompanyingdiagramswiththeirorderofpriority.Someinterruptsourceshavetheirown individualvectorwhileotherssharethesamemulti-functioninterruptvector.Onceaninterrupt subroutineisserviced,alltheotherinterruptswillbeblocked,astheglobalinterruptenablebit, EMIbitwillbeclearedautomatically.Thiswillpreventanyfurtherinterruptnestingfromoccurring. However,ifotherinterruptrequestsoccurduringthisinterval,althoughtheinterruptwillnotbe immediatelyserviced,therequestflagwillstillberecorded. Ifaninterruptrequiresimmediateservicingwhiletheprogramisalreadyinanotherinterruptservice routine,theEMIbitshouldbesetafterenteringtheroutine,toallowinterruptnesting.Ifthestack isfull,theinterruptrequestwillnotbeacknowledged,eveniftherelatedinterruptisenabled,until theStackPointerisdecremented.Ifimmediateserviceisdesired,thestackmustbepreventedfrom becomingfull.Incaseofsimultaneousrequests,theaccompanyingdiagramshowstheprioritythat isapplied.Alloftheinterruptrequestflagswhensetwillwake-upthedeviceifitisinSLEEPor IDLEMode,howevertopreventawake-upfromoccurringthecorrespondingflagshouldbeset beforethedeviceisinSLEEPorIDLEMode. |
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