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HT45FM2C Datasheet(PDF) 46 Page - Holtek Semiconductor Inc |
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HT45FM2C Datasheet(HTML) 46 Page - Holtek Semiconductor Inc |
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46 / 171 page  Rev. 1.10 46 �a� �0� �01� Rev. 1.10 47 �a� �0� �01� HT45FM2C Brushless DC Motor Flash Type 8-Bit MCU HT45FM2C Brushless DC Motor Flash Type 8-Bit MCU Preliminar� Standby Current Considerations AsthemainreasonforenteringtheSLEEPorIDLEModeistokeepthecurrentconsumptionof thisdevicetoaslowavalueaspossible,perhapsonlyintheorderofseveralmicro-ampsexcept intheIDLE1Mode,thereareotherconsiderationswhichmustalsobetakenintoaccountbythe circuitdesignerifthepowerconsumptionistobeminimised.Specialattentionmustbemadeto theI/Opinsonthisdevice.Allhigh-impedanceinputpinsmustbeconnectedtoeitherafixedhigh orlowlevelasanyfloatinginputpinscouldcreateinternaloscillationsandresultinincreased currentconsumption.Thisalsoappliestodeviceswhichhavedifferentpackagetypes,astheremay beunbondedpins.Thesemusteitherbesetupasoutputsorifsetupasinputsmusthavepull-high resistorsconnected. Caremustalsobetakenwiththeloads,whichareconnectedtoI/Opins,whicharesetupasoutputs. Theseshouldbeplacedinaconditioninwhichminimumcurrentisdrawnorconnectedonlyto externalcircuitsthatdonotdrawcurrent,suchasotherCMOSinputs.Alsonotethatadditional standbycurrentwillalsoberequirediftheconfigurationoptionshaveenabledtheLIRCoscillator. IntheIDLE1Modethesystemoscillatorison,ifthesystemoscillatorisfromthehighspeed systemoscillator,theadditionalstandbycurrentwillalsobeperhapsintheorderofseveralhundred micro-amps. Wake-up AfterthesystementerstheSLEEPorIDLEMode,itcanbewokenupfromoneofvarioussources listedasfollows: • Anexternalreset • AnexternalfallingedgeonPortA • Asysteminterrupt • AWDToverflow Ifthesystemiswokenupbyanexternalreset,thisdevicewillexperienceafullsystemreset, however,ifthisdevicearewokenupbyaWDToverflow,aWatchdogTimerresetwillbeinitiated. Althoughbothofthesewake-upmethodswillinitiatearesetoperation,theactualsourceofthe wake-upcanbedeterminedbyexaminingtheTOandPDFflags.ThePDFflagisclearedbya systempower-uporexecutingtheclearWatchdogTimerinstructionsandissetwhenexecutingthe “HALT”instruction.TheTOflagissetifaWDTtime-outoccurs,andcausesawake-upthatonly resetstheProgramCounterandStackPointer,theotherflagsremainintheiroriginalstatus. EachpinonPortAcanbesetupusingthePAWUregistertopermitanegativetransitiononthepin towake-upthesystem.WhenaPortApinwake-upoccurs,theprogramwillresumeexecutionat theinstructionfollowingthe“HALT”instruction.Ifthesystemiswokenupbyaninterrupt,then twopossiblesituationsmayoccur.Thefirstiswheretherelatedinterruptisdisabledortheinterrupt isenabledbutthestackisfull,inwhichcasetheprogramwillresumeexecutionattheinstruction followingthe“HALT”instruction.Inthissituation,theinterruptwhichwoke-upthisdevicewillnot beimmediatelyserviced,butwillratherbeservicedlaterwhentherelatedinterruptisfinallyenabled orwhenastacklevelbecomesfree.Theothersituationiswheretherelatedinterruptisenabledand thestackisnotfull,inwhichcasetheregularinterruptresponsetakesplace.Ifaninterruptrequest flagissethighbeforeenteringtheSLEEPorIDLEMode,thewake-upfunctionoftherelated interruptwillbedisabled. |
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