HT69F360 datasheet(73/235 Pages) HOLTEK

73 / 235 page

Rev. 1.30

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HT69F340/HT69F350/HT69F360

TinyPowerTM I/O Flash MCU with LCD & EEPROM

HT69F340/HT69F350/HT69F360

TinyPowerTM I/O Flash MCU with LCD & EEPROM

Entering the IDLE2 Mode

ThereisonlyonewayforthedevicetoentertheIDLE2Modeandthatistoexecutethe“HALT”

instructionintheapplicationprogramwiththeFHIDENbitinSCCregisterequalto“1”andthe

FSIDENbitinSCCregisterequalto“0”.Whenthisinstructionisexecutedundertheconditions

describedabove,thefollowingwilloccur:

• ThefHclockwillbeonwhilethefSUBclockwillbeoffandtheapplicationprogramwillstopat

the"HALT"instruction.

• TheDataMemorycontentsandregisterswillmaintaintheirpresentcondition.

• TheI/Oportswillmaintaintheirpresentconditions.

• Inthestatusregister,thePowerDownflag,PDF,willbesetandtheWatchdogtime-outflag,TO,

willbecleared.

• TheWDTwillbeclearedandresumecountingiftheWDTfunctionisenabled.IftheWDTis

disabledthenWDTwillbeclearedandstopped.

Standby Current Considerations

AsthemainreasonforenteringtheSLEEPorIDLEModeistokeepthecurrentconsumptionofthe

devicetoaslowavalueaspossible,perhapsonlyintheorderofseveralmicro-ampsexceptinthe

IDLE1andIDLE2Mode,thereareotherconsiderationswhichmustalsobetakenintoaccountby

thecircuitdesignerifthepowerconsumptionistobeminimised.Specialattentionmustbemade

totheI/Opinsonthedevice.Allhigh-impedanceinputpinsmustbeconnectedtoeitherafixed

highorlowlevelasanyfloatinginputpinscouldcreateinternaloscillationsandresultinincreased

currentconsumption.Thisalsoappliestodeviceswhichhavedifferentpackagetypes,astheremay

beunboundedpins.Thesemusteitherbesetupasoutputsorifsetupasinputsmusthavepull-high

resistorsconnected.

Caremustalsobetakenwiththeloads,whichareconnectedtoI/Opins,whicharesetupasoutputs.

Theseshouldbeplacedinaconditioninwhichminimumcurrentisdrawnorconnectedonlyto

externalcircuitsthatdonotdrawcurrent,suchasotherCMOSinputs.Alsonotethatadditional

standbycurrentwillalsoberequirediftheLIRCorLXToscillatorhasenabled.

IntheIDLE1andIDLE2Modethehighspeedoscillatorison,ifthesystemoscillatorisfromthe

highspeedoscillator,theadditionalstandbycurrentwillalsobeperhapsintheorderofseveral

hundredmicro-amps.

Wake-up

TominimisepowerconsumptionthedevicecanentertheSLEEPorIDLEMode,wheretheCPU

willbeswitchedoff.However,whenthedeviceiswokenupagain,itcantakeaconsiderabletime

fortheoriginalsystemoscillatortorestart,stabiliseandallownormaloperationtoresume.

AfterthesystementerstheSLEEPorIDLEModes,itcanbewokenupfromoneofvarioussources

listedasfollows:

• Anexternalreset

• AnexternalfallingedgeonPortA

• Asysteminterrupt

• AWDToverflow

Ifthesystemiswokenupbyanexternalreset,thedevicewillexperienceafullsystemreset,

however,ifthedeviceiswokenupbyaWDToverflow,aWatchdogTimerresetwillbeinitiated.

Althoughbothofthesewake-upmethodswillinitiatearesetoperation,theactualsourceofthe

wake-upcanbedeterminedbyexaminingtheTOandPDFflags.ThePDFflagisclearedbya

HT69F360 データシート(PDF) 73 Page - Holtek Semiconductor Inc

HT69F360 データシート(HTML) 73 Page - Holtek Semiconductor Inc

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