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HT48R002 데이터시트(PDF) 23 Page - Holtek Semiconductor Inc |
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HT48R002 데이터시트(HTML) 23 Page - Holtek Semiconductor Inc |
23 / 71 page 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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유사한 설명 - HT48R002 |
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