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HT66F20 Datasheet(PDF) 217 Page - Holtek Semiconductor Inc |
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HT66F20 Datasheet(HTML) 217 Page - Holtek Semiconductor Inc |
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217 / 298 page  Rev. 1.90 �16 �e���a�� 18� �01� Rev. 1.90 �17 �e���a�� 18� �01� HT66F20/HT66F30/HT66F40/HT66F50/HT66F60 HT66FU30/HT66FU40/HT66FU50/HT66FU60 Enhanced A/D Flash Type 8-Bit MCU with EEPROM HT66F20/HT66F30/HT66F40/HT66F50/HT66F60 HT66FU30/HT66FU40/HT66FU50/HT66FU60 Enhanced A/D Flash Type 8-Bit MCU with EEPROM Interrupt Operation Whentheconditionsforaninterrupteventoccur,suchasaTMComparatorP,ComparatorAor ComparatorBmatchorA/Dconversioncompletionetc,therelevantinterruptrequestflagwillbe set.Whethertherequestflagactuallygeneratesaprogramjumptotherelevantinterruptvectoris determinedbytheconditionoftheinterruptenablebit.Iftheenablebitissethighthentheprogram willjumptoitsrelevantvector;iftheenablebitiszerothenalthoughtheinterruptrequestflagis setanactualinterruptwillnotbegeneratedandtheprogramwillnotjumptotherelevantinterrupt vector.Theglobalinterruptenablebit,ifclearedtozero,willdisableallinterrupts. Whenaninterruptisgenerated,theProgramCounter,whichstorestheaddressofthenextinstruction tobeexecuted,willbetransferredontothestack.TheProgramCounterwillthenbeloadedwitha newaddresswhichwillbethevalueofthecorrespondinginterruptvector.Themicrocontrollerwill thenfetchitsnextinstructionfromthisinterruptvector.Theinstructionatthisvectorwillusually beaJMPwhichwilljumptoanothersectionofprogramwhichisknownastheinterruptservice routine.Hereislocatedthecodetocontroltheappropriateinterrupt.Theinterruptserviceroutine mustbeterminatedwithaRETI,whichretrievestheoriginalProgramCounteraddressfromthe stackandallowsthemicrocontrollertocontinuewithnormalexecutionatthepointwherethe 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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