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HT46R004 Datasheet(PDF) 59 Page - Holtek Semiconductor Inc |
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HT46R004 Datasheet(HTML) 59 Page - Holtek Semiconductor Inc |
59 / 84 page Rev. 1.30 58 �an�a�� ��� �01� Rev. 1.30 5� �an�a�� ��� �01� HT46R004 Cost-Effective A/D 8-Bit OTP MCU Interrupt Operation ATimer/EventCounteroverflow,acompletionofA/Dconversionoranactiveedgeontheexternal interruptpinwillallgenerateaninterruptrequestbysettingtheircorrespondingrequestflag,if theirappropriateinterruptenablebitisset.Whenthishappens,theProgramCounter,whichstores theaddressofthenextinstructiontobeexecuted,willbetransferredontothestack.TheProgram Counterwillthenbeloadedwithanewaddresswhichwillbethevalueofthecorresponding interruptvector.Themicrocontrollerwillthenfetchitsnextinstructionfromthisinterruptvector. TheinstructionatthisvectorwillusuallybeaJMPstatementwhichwilljumptoanothersection ofprogramwhichisknownastheinterruptserviceroutine.Hereislocatedthecodetocontrolthe appropriateinterrupt.TheinterruptserviceroutinemustbeterminatedwithaRETIinstruction, whichretrievestheoriginalProgramCounteraddressfromthestackandallowsthemicrocontroller tocontinuewithnormalexecutionatthepointwheretheinterruptoccurred. Thevariousinterruptenablebits,togetherwiththeirassociatedrequestflags,areshowninthe followingdiagramwiththeirorderofpriority. Interrupt Scheme Onceaninterruptsubroutineisserviced,alltheotherinterruptswillbeblocked,astheEMIbitwill beclearedautomatically.Thiswillpreventanyfurtherinterruptnestingfromoccurring.However, ifotherinterruptrequestsoccurduringthisinterval,althoughtheinterruptwillnotbeimmediately serviced,therequestflagwillstillberecorded.Ifaninterruptrequiresimmediateservicingwhilethe programisalreadyinanotherinterruptserviceroutine,theEMIbitshouldbesetafterenteringthe routine,toallowinterruptnesting.Ifthestackisfull,theinterruptrequestwillnotbeacknowledged, eveniftherelatedinterruptisenabled,untiltheStackPointerisdecremented.Ifimmediateservice isdesired,thestackmustbepreventedfrombecomingfull. Whenaninterruptrequestisgeneratedittakes2or3instructioncyclesbeforetheprogramjumpsto theinterruptvector.IfthedeviceisintheSleepModeandiswokenupbyaninterruptrequestthen itwilltake3cyclesbeforetheprogramjumpstotheinterruptvector. |
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