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HT45F0027 bảng dữ liệu(PDF) 39 Page - Holtek Semiconductor Inc |
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HT45F0027 bảng dữ liệu(HTML) 39 Page - Holtek Semiconductor Inc |
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39 / 112 page  Rev. 1.20 38 �an�a�� 21� 201� Rev. 1.20 39 �an�a�� 21� 201� HT45F0027 PIR 8-Bit Flash MCU HT45F0027 PIR 8-Bit Flash MCU Standby Current Considerations AsthemainreasonforenteringtheSLEEPorIDLEModeistokeepthecurrentconsumptionofthe devicetoaslowavalueaspossible,perhapsonlyintheorderofseveralmicro-ampsexceptinthe IDLE1Mode,thereareotherconsiderationswhichmustalsobetakenintoaccountbythecircuit designerifthepowerconsumptionistobeminimised.SpecialattentionmustbemadetotheI/Opins onthedevice.Allhigh-impedanceinputpinsmustbeconnectedtoeitherafixedhighorlowlevelas anyfloatinginputpinscouldcreateinternaloscillationsandresultinincreasedcurrentconsumption. Thisalsoappliestothedevicewhichhasdifferentpackagetypes,astheremaybeunbondedpins. Thesemusteitherbesetupasoutputsorifsetupasinputsmusthavepull-highresistorsconnected. Caremustalsobetakenwiththeloads,whichareconnectedtoI/Opins,whicharesetupasoutputs. Theseshouldbeplacedinaconditioninwhichminimumcurrentisdrawnorconnectedonlyto externalcircuitsthatdonotdrawcurrent,suchasotherCMOSinputs. IntheIDLE1Modethesystemoscillatorison,ifthesystemoscillatorisfromthehighspeedsystem oscillator,theadditionalstandbycurrentwillalsobeperhapsintheorderofseveralhundredmicro- amps. Wake-up AfterthesystementerstheSLEEPorIDLEMode,itcanbewokenupfromoneofvarioussources listedasfollows: • Anexternalreset • AnexternalfallingedgeonPortA • Asysteminterrupt • AWDToverflow Whenthedeviceexecutesthe"HALT"instruction,thePDFflagwillbesetto1.ThePDFflagwill beclearedto0ifthedeviceexperiencesasystempower-uporexecutestheclearWatchdogTimer instruction.IfthesystemiswokenupbyaWDToverflow,aWatchdogTimerresetwillbeinitiated andtheTOflagwillbesetto1.TheTOflagissetifaWDTtime-outoccursandcausesawake-up thatonlyresetstheProgramCounterandStackPointer,otherflagsremainintheiroriginalstatus. 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. |
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