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HT45F4M Datasheet(PDF) 111 Page - Holtek Semiconductor Inc |
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HT45F4M Datasheet(HTML) 111 Page - Holtek Semiconductor Inc |
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111 / 138 page  Rev. 1.10 110 �an�a�� 1�� �01� Rev. 1.10 111 �an�a�� 1�� �01� HT45F4M Lithium Battery Backup Power ASSP MCU HT45F4M Lithium Battery Backup Power ASSP MCU MFI2 Register Bit 7 6 5 4 3 2 1 0 Name — — DEF LVF — — DEE LVE R/W — — R/W R/W — — R/W R/W POR — — 0 0 — — 0 0 Bit7~6 Unimplemented,readas"0" Bit5 DEF:DataEEPROMinterruptrequestflag 0:norequest 1:interruptrequest Bit4 LVF:LVDinterruptrequestflag 0:norequest 1:interruptrequest Bit3~2 Unimplemented,readas"0" Bit1 DEE:DataEEPROMInterruptControl 0:disable 1:enable Bit0 LVE:LVDInterruptControl 0:disable 1:enable Interrupt Operation Whentheconditionsforaninterrupteventoccur,suchasaTMComparatorPorComparatorA 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. |
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