HT67F5630 datasheet(44/147 Pages) HOLTEK

44 / 147 page

Rev. 1.20

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HT67F5630

TinyPowerTM 24-Bit Delta Sigma

A/D Flash MCU with LCD & EEPROM

HT67F5630

TinyPowerTM 24-Bit Delta Sigma

A/D Flash MCU with LCD & EEPROM

Fast Wake-up

TominimisepowerconsumptionthedevicecanentertheSLEEPorIDLE0Mode,wherethesystem

clocksourcetothedevicewillbestopped.Howeverwhenthedeviceiswokenupagain,itcantake

aconsiderabletimefortheoriginalsystemoscillatortorestart,stabiliseandallownormaloperation

toresume.ToensurethedeviceisupandrunningasfastaspossibleaFastWake-upfunctionis

provided,whichallowsfSUB,namelyLIRCoscillator,toactasatemporaryclocktofirstdrivethe

systemuntiltheoriginalsystemoscillatorhasstabilised.AstheclocksourcefortheFastWake-

upfunctionisfSUB,theFastWake-upfunctionisonlyavailableintheSLEEP1andIDLE0modes.

WhenthedeviceiswokenupfromtheSLEEP0mode,theFastWake-upfunctionhasnoeffect

becausethefSUBclockisstopped.TheFastWake-upenable/disablefunctioniscontrolledusingthe

FSTENbitintheSMODregister.

IftheHXToscillatorisselectedastheNORMALModesystemclock,andiftheFastWake-up

functionisenabled,thenitwilltakeonetotwotSUBclockcyclesoftheLIRCoscillatorforthe

systemtowake-up.ThesystemwilltheninitiallyrununderthefSUBclocksourceuntil1024HXT

clockcycleshaveelapsed,atwhichpointtheHTOflagwillswitchhighandthesystemwillswitch

overtooperatingfromtheHXToscillator.

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 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 cycles 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 1~2 LIRC �y�les

1~2 LIRC �y�les

“×”: don’t �a�e

Wake-Up Times

NotethatiftheWatchdogTimerisdisabled,whichmeansthattheLIRCisoff,thentherewillbeno

FastWake-upfunctionavailablewhenthedevicewake-upfromtheSLEEP0Mode.

HT67F5630 Datasheet(PDF) 44 Page - Holtek Semiconductor Inc

HT67F5630 Datasheet(HTML) 44 Page - Holtek Semiconductor Inc

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