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HT45F3520 Datasheet(PDF) 44 Page - Holtek Semiconductor Inc |
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HT45F3520 Datasheet(HTML) 44 Page - Holtek Semiconductor Inc |
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44 / 134 page  Rev. 1.10 44 De�e��e� 1�� �01� Rev. 1.10 45 De�e��e� 1�� �01� HT45F3520/HT45F3530 Personal Care Flash MCU HT45F3520/HT45F3530 Personal Care Flash MCU Entering the IDLE0 Mode ThereisonlyonewayforthedevicestoentertheIDLE0Modeandthatistoexecutethe"HALT" instructionintheapplicationprogramwiththeIDLENbitinSMODregisterequalto"1"andthe FSYSONbitinSMOD1registerequalto"0".Whenthisinstructionisexecutedundertheconditions describedabove,thefollowingwilloccur: • Thesystemclockwillbestoppedandtheapplicationprogramwillstopatthe"HALT"instruc- tion,buttheTimeBaseclockwillbeon. • TheDataMemorycontentsandregisterswillmaintaintheirpresentcondition. • TheWDTwillbeclearedandresumecounting. • TheI/Oportswillmaintaintheirpresentconditions. • Inthestatusregister,thePowerDownflag,PDF,willbesetandtheWatchdogtime-outflag,TO, willbecleared. Entering the IDLE1 Mode ThereisonlyonewayforthedevicestoentertheIDLE1Modeandthatistoexecutethe"HALT" instructionintheapplicationprogramwiththeIDLENbitinSMODregisterequalto"1"andthe FSYSONbitinSMOD1registerequalto"1".Whenthisinstructionisexecutedundertheconditions describedabove,thefollowingwilloccur: • ThesystemclockandTimeBaseclockwillbeonandtheapplicationprogramwillstopatthe "HALT"instruction. • TheDataMemorycontentsandregisterswillmaintaintheirpresentcondition. • TheWDTwillbeclearedandresumecounting. • TheI/Oportswillmaintaintheirpresentconditions. • Inthestatusregister,thePowerDownflag,PDF,willbesetandtheWatchdogtime-outflag,TO, willbecleared. Standby Current Considerations AsthemainreasonforenteringtheSLEEPorIDLEModeistokeepthecurrentconsumptionof thedevicestoaslowavalueaspossible,perhapsonlyintheorderofseveralmicro-ampsexcept intheIDLE1Mode,thereareotherconsiderationswhichmustalsobetakenintoaccountbythe circuitdesignerifthepowerconsumptionistobeminimised.Specialattentionmustbemadeto theI/Opinsonthedevices.Allhigh-impedanceinputpinsmustbeconnectedtoeitherafixed highorlowlevelasanyfloatinginputpinscouldcreateinternaloscillationsandresultinincreased currentconsumption.Thisalsoappliestodeviceswhichhavedifferentpackagetypes,astheremay beunbonbedpins.Thesemusteitherbesetupasoutputsorifsetupasinputsmusthavepull-high resistorsconnected. Caremustalsobetakenwiththeloads,whichareconnectedtoI/Opins,whicharesetupas outputs.Theseshouldbeplacedinaconditioninwhichminimumcurrentisdrawnorconnected onlytoexternalcircuitsthatdonotdrawcurrent,suchasotherCMOSinputs.IntheIDLE1Mode thesystemoscillatorison,ifthesystemoscillatorisfromthehighspeedsystemoscillator,the additionalstandbycurrentwillalsobeperhapsintheorderofseveralhundredmicro-amps. |
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