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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT45F4M датащи(PDF) 40 Page - Holtek Semiconductor Inc |
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HT45F4M датащи(HTML) 40 Page - Holtek Semiconductor Inc |
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40 / 138 page  Rev. 1.10 40 �an�a�� 1�� �01� Rev. 1.10 41 �an�a�� 1�� �01� HT45F4M Lithium Battery Backup Power ASSP MCU HT45F4M Lithium Battery Backup Power ASSP MCU Standby Current Considerations AsthemainreasonforenteringtheSLEEPorIDLEModeistokeepthecurrentconsumptionofthe devicetoaslowavalueaspossible,perhapsonlyintheorderofseveralmicro-ampsexceptinthe IDLE1Mode,thereareotherconsiderationswhichmustalsobetakenintoaccountbythecircuit designerifthepowerconsumptionistobeminimised.SpecialattentionmustbemadetotheI/Opins onthedevice.Allhigh-impedanceinputpinsmustbeconnectedtoeitherafixedhighorlowlevelas anyfloatinginputpinscouldcreateinternaloscillationsandresultinincreasedcurrentconsumption. Thisalsoappliestodeviceswhichhavedifferentpackagetypes,astheremaybeunbonbedpins. Thesemusteitherbesetupasoutputsorifsetupasinputsmusthavepull-highresistorsconnected. Caremustalsobetakenwiththeloads,whichareconnectedtoI/Opins,whicharesetupas outputs.Theseshouldbeplacedinaconditioninwhichminimumcurrentisdrawnorconnected onlytoexternalcircuitsthatdonotdrawcurrent,suchasotherCMOSinputs.IntheIDLE1Mode thesystemoscillatorison,ifthesystemoscillatorisfromthehighspeedsystemoscillator,the additionalstandbycurrentwillalsobeperhapsintheorderofseveralhundredmicro-amps. Wake-up AfterthesystementerstheSLEEPorIDLEMode,itcanbewokenupfromoneofvarioussources listedasfollows: • AnexternalfallingedgeonPortA • Asysteminterrupt • AWDToverflow IfthedeviceiswokenupbyaWDToverflow,aWatchdogTimerresetwillbeinitiated.Theactual sourceofthewake-upcanbedeterminedbyexaminingtheTOandPDFflags.ThePDFflagis clearedbyasystempower-uporexecutingtheclearWatchdogTimerinstructionsandissetwhen executingthe“HALT”instruction.TheTOflagissetifaWDTtime-outoccurs,andcausesawake- upthatonlyresetstheProgramCounterandStackPointer,theotherflagsremainintheiroriginal status. 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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