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HT48R002 데이터시트(PDF) 23 Page - Holtek Semiconductor Inc

부품명 HT48R002
상세설명  Cost-Effective I/O 8-Bit OTP MCU
Download  71 Pages
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제조업체  HOLTEK [Holtek Semiconductor Inc]
홈페이지  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT48R002 데이터시트(HTML) 23 Page - Holtek Semiconductor Inc

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Rev. 1.11
22
April 11, 2017
Rev. 1.11
23
April 11, 2017
HT48R002/HT48R003
Cost-Effective I/O 8-Bit OTP MCU
HT48R002/HT48R003
Cost-Effective I/O 8-Bit OTP MCU
Power Down Mode and Wake-up
Power Down Mode
AlloftheHoltekmicrocontrollershavetheabilitytoenteraPowerDownMode,alsoknownasthe
HALTModeorSleepMode.Whenthedevicesenterthismode,thenormaloperatingcurrentwill
bereducedtoanextremelylowstandbycurrentlevel.Thisoccursbecausewhenthedevicesenter
thePowerDownMode,thesystemoscillatorisstoppedwhichreducesthepowerconsumptionto
extremelylowlevels.However,asthedevicesmaintaintheirpresentinternalcondition,theycan
bewokenupatalaterstageandcontinuerunning,withoutrequiringafullreset.Thisfeatureis
extremelyimportantinapplicationareaswheretheMCUsmusthavetheirpowersupplyconstantly
maintainedtokeepthedevicesinaknowncondition.
Entering the Power Down Mode
ThereisonlyonewayforthedevicetoenterthePowerDownModeandthatistoexecutethe
“HALT”instructionintheapplicationprogram.Whenthisinstructionisexecuted,thefollowingwill
occur:
• Thesystemoscillatorwillstoprunningandtheapplicationprogramwillstopatthe“HALT”
instruction.
• TheDataMemorycontentsandregisterswillmaintaintheirpresentcondition.
• TheWDTwillbeclearedandresumecounting.
• TheI/Oportswillmaintaintheirpresentcondition.
Inthestatusregister,thePowerDownflag,PDF,willbesetandtheWatchdogtime-outflag,TO,
willbecleared.
Standby Current Considerations
AsthemainreasonforenteringtheSleepModeistokeepthecurrentconsumptionofthe
MCUtoaslowavalueaspossible,perhapsonlyintheorderofseveralmicro-amps,thereare
otherconsiderationswhichmustalsobetakenintoaccountbythecircuitdesignerifthepower
consumptionistobeminimized.
SpecialattentionmustbemadetotheI/Opinsonthedevice.Allhigh-impedanceinputpinsmust
beconnectedtoeitherafixedhighorlowlevelasanyfloatinginputpinscouldcreateinternal
oscillationsandresultinincreasedcurrentconsumption.Caremustalsobetakenwiththeloads,
whichareconnectedtoI/Opins,whicharesetasoutputs.Theseshouldbeplacedinaconditionin
whichminimumcurrentisdrawnorconnectedonlytoexternalcircuitsthatdonotdrawcurrent,
suchasotherCMOSinputs.


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