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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT68F005 데이터시트(PDF) 72 Page - Holtek Semiconductor Inc |
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HT68F005 데이터시트(HTML) 72 Page - Holtek Semiconductor Inc |
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72 / 93 page  Rev. 1.00 7� ��to�e� ��� �01� Rev. 1.00 73 ��to�e� ��� �01� HT68F005/HT68F006 Enhanced I/O Flash Type MCU HT68F005/HT68F006 Enhanced I/O Flash Type MCU Interrupt Operation Whentheconditionsforaninterrupteventoccur,suchasaTMComparatorPorComparatorA match,etc.,therelevantinterruptrequestflagwillbeset.Whethertherequestflagactuallygenerates aprogramjumptotherelevantinterruptvectorisdeterminedbytheconditionoftheinterruptenable bit.Iftheenablebitissethighthentheprogramwilljumptoitsrelevantvector;iftheenablebitis zerothenalthoughtheinterruptrequestflagissetanactualinterruptwillnotbegeneratedandthe programwillnotjumptotherelevantinterruptvector.Theglobalinterruptenablebit,ifclearedto zero,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-upthedevicesifitisinSLEEPor IDLEMode,howevertopreventawake-upfromoccurringthecorrespondingflagshouldbeset beforethedevicesareinSLEEPorIDLEMode. |
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