HT45F65 datasheet(52/231 Pages) HOLTEK

52 / 231 page

Rev. 1.60

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Rev. 1.60

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HT45F65/HT45F66/HT45F67

Glucose Meter 8-Bit Flash MCU

Bit2

HTO:Highspeedsystemoscillatorreadyflag

0:Notready

1:Ready

Thisisthehighspeedsystemoscillatorreadyflagwhichindicateswhenthehighspeed

systemoscillatorisstable.Thisflagisclearedto"0"byhardwarewhenthedeviceis

poweredonandthenchangestoahighlevelafterthehighspeedsystemoscillatoris

stable.

Thereforethisflagwillalwaysbereadas"1"bytheapplicationprogramafterdevice

power-on.TheflagwillbelowwhenintheSLEEPorIDLE0Modebutafterawake-

uphasoccurred,theflagwillchangetoahighlevelafter1024clockcyclesiftheHXT

oscillatorisusedandafter15~16clockcyclesiftheERCorHIRCoscillatorisused.

Bit1

IDLEN:IDLEModecontrol

0:Disable

1:Enable

ThisistheIDLEModeControlbitanddetermineswhathappenswhentheHALT

instructionisexecuted.Ifthisbitishigh,whenaHALTinstructionisexecutedthe

devicewillentertheIDLEMode.IntheIDLE1ModetheCPUwillstoprunning

butthesystemclockwillcontinuetokeeptheperipheralfunctionsoperational,if

FSYSONbitishigh.IfFSYSONbitislow,theCPUandthesystemclockwillallstop

inIDLE0mode.IfthebitislowthedevicewillentertheSLEEPModewhenaHALT

instructionisexecuted.

Bit0

HLCLK:systemclockselection

0:fH/2~fH/64orfL

1:fH

ThisbitisusedtoselectifthefHclockorthefH/2~fH/64orfLclockisusedasthe

systemclock.WhenthebitishighthefHclockwillbeselectedandiflowthe

fH/2~fH/64orfLclockwillbeselected.WhensystemclockswitchesfromthefHclock

tothefLclockandthefHclockwillbeautomaticallyswitchedofftoconservepower.

Fast Wake-up

TominimisepowerconsumptionthedevicecanentertheSLEEPorIDLE0Mode,wherethesystem

clocksourcetothedevicewillbestopped.Howeverwhenthedeviceiswokenupagain,itcantake

aconsiderabletimefortheoriginalsystemoscillatortorestart,stabiliseandallownormaloperation

toresume.ToensurethedeviceisupandrunningasfastaspossibleaFastWake-upfunctionis

provided,whichallowsfSUB,namelyeithertheLXTorLIRCoscillator,toactasatemporaryclock

tofirstdrivethesystemuntiltheoriginalsystemoscillatorhasstabilised.Astheclocksourcefor

theFastWake-upfunctionisfSUB,theFastWake-upfunctionisonlyavailableintheSLEEP1and

IDLE0modes.WhenthedeviceiswokenupfromtheSLEEP0mode,theFastWake-upfunctionhas

noeffectbecausethefSUBclockisstopped.TheFastWake-upenable/disablefunctioniscontrolled

usingtheFSTENbitintheSMOD0register.

IftheHXToscillatorisselectedastheNORMALModesystemclock,andiftheFastWake-up

functionisenabled,thenitwilltakeonetotwotSUBclockcyclesoftheLIRCorLXToscillatorfor

thesystemtowake-up.ThesystemwilltheninitiallyrununderthefSUBclocksourceuntil1024

HXTclockcycleshaveelapsed,atwhichpointtheHTOflagwillswitchhighandthesystemwill

switchovertooperatingfromtheHXToscillator.

IftheERCorHIRCoscillatorsorLIRCoscillatorisusedasthesystemoscillatorthenitwilltake

15~16clockcyclesoftheERCorHIRCor1~2cyclesoftheLIRCtowakeupthesystemfromthe

SLEEPorIDLE0Mode.TheFastWake-upbit,FSTENwillhavenoeffectinthesecases.

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