HT45F3W datasheet(55/167 Pages) HOLTEK

55 / 167 page

Rev. 1.50

De�e��e� 01� �01�

Rev. 1.50

De�e��e� 01� �01�

HT45F3W

R-Type Blood Pressure Meter Flash MCU

HT45F3W

R-Type Blood Pressure Meter 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

usingtheFSTENbitintheSMOD0register.

IftheHXToscillatorisselectedastheNORMALModesystemclock,andiftheFastWake-up

functionisenabled,thenitwilltakeonetotwotSUBclockcyclesoftheLIRCorLXToscillator

forthesystemtowake-up.ThesystemwilltheninitiallyrununderthefSUBclocksourceuntil1024

HXTclockcycleshaveelapsed,atwhichpointtheHTOflagwillswitchhighandthesystemwill

switchovertooperatingfromtheHXToscillator.

IftheERCorHIRCoscillatorsorLIRCoscillatorisusedasthesystemoscillatorthenitwilltake

15~16clockcyclesoftheERCorHIRCor1~2cyclesoftheLIRCtowakeupthesystemfromthe

SLEEPorIDLE0Mode.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

10�4 HXT �y�les 10�4 HXT �y�les

1~� HXT �y�les

10�4 HXT �y�les

1~� 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~� HXT �y�les

ERC

15~1� ERC �y�les 15~1� ERC �y�les

1~� ERC �y�les

HIRC

15~1� HIRC �y�les 15~1� HIRC �y�les

1~� HIRC �y�les

LIRC

1~� LIRC �y�les 1~� LIRC �y�les

1~� LIRC �y�les

LXT

10�4 LTX �y�les 10�4 LTX �y�les

1~� LXT �y�les

Wake-Up Times

NotethatiftheWatchdogTimerisdisabled,whichmeansthattheLXTandLIRCareallbothoff,

thentherewillbenoFastWake-upfunctionavailablewhenthedevicewake-upfromtheSLEEP0

Mode.

HT45F3W Datasheet(PDF) 55 Page - Holtek Semiconductor Inc

HT45F3W Datasheet(HTML) 55 Page - Holtek Semiconductor Inc

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