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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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HT45F12 bảng dữ liệu(PDF) 45 Page - Holtek Semiconductor Inc |
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HT45F12 bảng dữ liệu(HTML) 45 Page - Holtek Semiconductor Inc |
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45 / 104 page  Rev. 0.00 44 �e�te��e� ��� �01� Rev. 0.00 45 �e�te��e� ��� �01� HT45F12 8-Bit Flash MCU with Op Amps & Comparators HT45F12 8-Bit Flash MCU with Op Amps & Comparators EachpinonPortAcanbesetupusingthePAWUregistertopermitanegativetransitiononthepin towake-upthesystem.WhenaPortApinwake-upoccurs,theprogramwillresumeexecutionat theinstructionfollowingthe“HALT”instruction.Ifthesystemiswokenupbyaninterrupt,then twopossiblesituationsmayoccur.Thefirstiswheretherelatedinterruptisdisabledortheinterrupt isenabledbutthestackisfull,inwhichcasetheprogramwillresumeexecutionattheinstruction followingthe“HALT”instruction.Inthissituation,theinterruptwhichwoke-upthedevicewillnot beimmediatelyserviced,butwillratherbeservicedlaterwhentherelatedinterruptisfinallyenabled orwhenastacklevelbecomesfree.Theothersituationiswheretherelatedinterruptisenabledand thestackisnotfull,inwhichcasetheregularinterruptresponsetakesplace.Ifaninterruptrequest flagissethighbeforeenteringtheSLEEPorIDLEMode,thewake-upfunctionoftherelated interruptwillbedisabled. Watchdog Timer TheWatchdogTimerisprovidedtopreventprogrammalfunctionsorsequencesfromjumpingto unknownlocations,duetocertainuncontrollableexternaleventssuchaselectricalnoise. Watchdog Timer Clock Source TheWatchdogTimerclocksourceisprovidedbytheinternalclock,fS,whichisinturnsuppliedby theLIRCoscillator.TheLIRCinternaloscillatorhasanapproximateperiodof32kHzatasupply voltageof5V.However,itshouldbenotedthatthisspecifiedinternalclockperiodcanvarywith VDD,temperatureandprocessvariations.TheWatchdogTimersourceclockisthensubdividedbya ratioof28to218togivelongertimeouts,theactualvaluebeingchosenusingtheWS2~WS0bitsin theWDTCregister. Watchdog Timer Control Register Asingleregister,WDTC,controlstherequiredtimeoutperiodaswellastheenable/disable operation.Thisregistertogetherwithseveralconfigurationoptionscontroltheoveralloperationof theWatchdogTimer. WDTC Register Bit 7 6 5 4 3 2 1 0 Na�e WE4 WE3 WE� WE1 WE0 W�� W�1 W�0 R/W R/W R/W R/W R/W R/W R/W R/W R/W POR 0 1 0 1 0 0 1 1 Bit7~3 WE4 ~ WE0:WDTenablebit IftheWDTconfigurationoptionisselectedas“AlwaysEnabled”: 10101or01010:Enabled Other:ResetMCU IftheWDTconfigurationoptionisselectedas“ApplicationProgramEnabled”: 10101:Disabled 01010:Enabled OtherValues:ResetMCU Ifthesebitsarechangedduetoadverseenvironmentalconditions,themicrocontroller willbereset.Theresetoperationwillbeactivatedafter2~3LIRCclockcyclesandthe WRFbitintheCTRLregisterwillbesetto1. |
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