HT45F77 datasheet(52/203 Pages) HOLTEK

52 / 203 page

Rev. 1.20

De�e��e� 1�� 201�

Rev. 1.20

De�e��e� 1�� 201�

HT45F77

Body Fat Scale Flash MCU

HT45F77

Body Fat Scale Flash MCU

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

usingtheFSTENbitintheSMODregister.

IftheHXToscillatorisselectedastheNORMALModesystemclock,andiftheFastWake-up

functionisenabled,thenitwilltakeonetotwotSUBclockcyclesoftheLIRCorLXToscillatorfor

thesystemtowake-up.ThesystemwilltheninitiallyrununderthefSUBclocksourceuntil1024

HXTclockcycleshaveelapsed,atwhichpointtheHTOflagwillswitchhighandthesystemwill

switchovertooperatingfromtheHXToscillator.

IftheHIRCoscillatororLIRCoscillatorisusedasthesystemoscillatorthenitwilltake15~16

clockcyclesoftheHIRCor1~2cyclesoftheLIRCtowakeupthesystemfromtheSLEEPor

IDLE0Mode.TheFastWake-upbit,FSTENwillhavenoeffectinthesecases.

System

Oscillator

FSTEN

Bit

Wake-up Time

(SLEEP0 Mode)

Wake-up Time

(SLEEP1 Mode)

Wake-up Time

(IDLE0 Mode)

Wake-up Time

(IDLE1 Mode)

HXT

102� HXT �y�les

1~2 HXT �y�les

102� HXT �y�les

1~2 fSUB �y�les

(Syste� �uns with fSUB first for 1024

HXT �y�les and then swit�hes ove�

to �un with the HXT �lo�k)

1~2 HXT �y�les

HIRC

15~1� HIRC �y�les 15~1� HIRC �y�les

1~2 HIRC �y�les

LIRC

1~2 LIRC �y�les

LXT

102� LXT �y�les

1~2 LXT �y�les

"×": don’t �a�e

Wake-Up Times

NotethatiftheWatchdogTimerisdisabled,whichmeansthattheLXTandLIRCareallbothoff,

thentherewillbenoFastWake-upfunctionavailablewhenthedevicewake-upfromtheSLEEP0

Mode.

HT45F77 Datasheet(PDF) 52 Page - Holtek Semiconductor Inc

HT45F77 Datasheet(HTML) 52 Page - Holtek Semiconductor Inc

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