ETIC 2230 User's Guide download pdf (Page 40)

Rev. 1.10 40 November 14, 2014 Rev. 1.10 41 November 14, 2014

HT66FW2230

Wireless Charger A/D Flash 8-Bit MCU

Entering the IDLE2 Mode

ThereisonlyonewayforthedevicetoentertheIDLE2Modeandthatistoexecutethe“HALT”

instructionintheapplicationprogramwiththeFHIDENbitintheSCCregisterequalto“1”andthe

FLIDENbitinSCCregisterequalto“0”.Whenthisinstructionisexecutedundertheconditions

describedabove,thefollowingwilloccur:

• Thef

clockwillbeonbutthef

SUB

clockwillbeoffandtheapplicationprogramwillstopatthe

“HALT”instruction.

• TheDataMemorycontentsandregisterswillmaintaintheirpresentcondition.

• TheI/Oportsofperipheraldevicewillkeeptoworkwhenitisenabledandclockisfromf

SYS

•

Inthestatusregister,thePowerDownagPDFwillbeset,andWDTtimeoutagTOwillbe

cleared.

•

TheWDTwillbeclearedandresumecounting.

Standby Current Considerations

AsthemainreasonforenteringtheSLEEPorIDLEModeistokeepthecurrentconsumptionofthe

devicetoaslowavalueaspossible,perhapsonlyintheorderofseveralmicro-ampsexceptinthe

IDLE1andIDLE2Mode,thereareotherconsiderationswhichmustalsobetakenintoaccountby

thecircuitdesignerifthepowerconsumptionistobeminimised.Specialattentionmustbemade

totheI/Opinsonthedevice.Allhigh-impedanceinputpinsmustbeconnectedtoeitheraxed

highorlowlevelasanyoatinginputpinscouldcreateinternaloscillationsandresultinincreased

currentconsumption.Thisalsoappliestodeviceswhichhavedifferentpackagetypes,astheremay

beunbonbedpins.Thesemusteitherbesetupasoutputsorifsetupasinputsmusthavepull-high

resistorsconnected.

Caremustalsobetakenwiththeloads,whichareconnectedtoI/Opins,whicharesetupasoutputs.

Theseshouldbeplacedinaconditioninwhichminimumcurrentisdrawnorconnectedonlyto

externalcircuitsthatdonotdrawcurrent,suchasotherCMOSinputs.Alsonotethatadditional

standbycurrentwillalsoberequirediftheLIRCoscillatorhasenabled.

IntheIDLE1andIDLE2Modethehighspeedoscillatorison,ifthesystemoscillatorisfromthe

highspeedoscillator,theadditionalstandbycurrentwillalsobeperhapsintheorderofseveral

hundredmicro-amps.

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ETIC 2230 User's Guide Page 40