HT66F4530 datasheet(63/224 Pages) HOLTEK

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HT66F4530/HT66F4540/HT66F4550

A/D Flash MCU with Dual Operational Amplifiers

HT66F4530/HT66F4540/HT66F4550

A/D Flash MCU with Dual Operational Amplifiers

Standby Current Considerations

AsthemainreasonforenteringtheSLEEPorIDLEModeistokeepthecurrentconsumptionof

thesedevicestoaslowavalueaspossible,perhapsonlyintheorderofseveralmicro-ampsexcept

intheIDLE1andIDLE2Mode,thereareotherconsiderationswhichmustalsobetakenintoaccount

bythecircuitdesignerifthepowerconsumptionistobeminimised.Specialattentionmustbemade

totheI/Opinsonthesedevices.Allhigh-impedanceinputpinsmustbeconnectedtoeitherafixed

highorlowlevelasanyfloatinginputpinscouldcreateinternaloscillationsandresultinincreased

currentconsumption.Thisalsoappliestothesedeviceswhichhavedifferentpackagetypes,asthere

maybeunbondedpins.Thesemusteitherbesetupasoutputsorifsetupasinputsmusthavepull-

highresistorsconnected.

Caremustalsobetakenwiththeloads,whichareconnectedtoI/Opins,whicharesetupasoutputs.

Theseshouldbeplacedinaconditioninwhichminimumcurrentisdrawnorconnectedonlyto

externalcircuitsthatdonotdrawcurrent,suchasotherCMOSinputs.Alsonotethatadditional

standbycurrentwillalsoberequirediftheLXTorLIRCoscillatorhasenabled.

IntheIDLE1andIDLE2Modethehighspeedoscillatorison,iftheperipheralfunctionclock

sourceisderivedfromthehighspeedoscillator,theadditionalstandbycurrentwillalsobeperhaps

intheorderofseveralhundredmicro-amps.

Wake-up

TominimisepowerconsumptionthesedevicescanentertheSLEEPoranyIDLEMode,wherethe

CPUwillbeswitchedoff.However,whenthesedevicesarewokenupagain,itwilltakeaconsiderable

timefortheoriginalsystemoscillatortorestart,stabiliseandallownormaloperationtoresume.

AfterthesystementerstheSLEEPorIDLEMode,itcanbewokenupfromoneofvarioussources

listedasfollows:

• AnexternalRESpinreset

• AnexternalfallingedgeonPortA

• Asysteminterrupt

• AWDToverflow

IfthesystemiswokenupbyanexternalRESpinreset,thesedeviceswillexperienceafullsystem

reset,however,ifthesedevicesarewokenupbyaWDToverflow,aWatchdogTimerresetwillbe

initiated.Althoughbothofthesewake-upmethodswillinitiatearesetoperation,theactualsource

ofthewake-upcanbedeterminedbyexaminingtheTOandPDFflags.ThePDFflagisclearedbya

systempower-uporexecutingtheclearWatchdogTimerinstructionsandissetwhenexecutingthe

"HALT"instruction.TheTOflagissetifaWDTtime-outoccurs,andcausesawake-upthatonly

resetstheProgramCounterandStackPointer,theotherflagsremainintheiroriginalstatus.

EachpinonPortAcanbesetupusingthePAWUregistertopermitanegativetransitiononthe

pintowake-upthesystem.Whenapinwake-upoccurs,theprogramwillresumeexecutionatthe

instructionfollowingthe"HALT"instruction.Ifthesystemiswokenupbyaninterrupt,thentwo

possiblesituationsmayoccur.Thefirstiswheretherelatedinterruptisdisabledortheinterrupt

isenabledbutthestackisfull,inwhichcasetheprogramwillresumeexecutionattheinstruction

followingthe"HALT"instruction.Inthissituation,theinterruptwhichwoke-upthesedeviceswill

notbeimmediatelyserviced,butwillratherbeservicedlaterwhentherelatedinterruptisfinally

enabledorwhenastacklevelbecomesfree.Theothersituationiswheretherelatedinterruptis

enabledandthestackisnotfull,inwhichcasetheregularinterruptresponsetakesplace.Ifan

interruptrequestflagissethighbeforeenteringtheSLEEPorIDLEMode,thewake-upfunctionof

therelatedinterruptwillbedisabled.

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