HT67F5650 datasheet(66/235 Pages) HOLTEK

66 / 235 page

Rev. 1.30

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Rev. 1.30

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HT67F5650/HT67F5660

24-Bit Delta Sigma A/D + LCD Flash MCU

HT67F5650/HT67F5660

24-Bit Delta Sigma A/D + LCD Flash MCU

Fast Wake-up

TominimisepowerconsumptionthesedevicescanentertheSLEEPorIDLE0Mode,wherethe

systemclocksourcetothesedeviceswillbestopped.Howeverwhenthesedevicesarewokenup

again,theycantakeaconsiderabletimefortheoriginalsystemoscillatortorestart,stabiliseand

allownormaloperationtoresume.Toensurethesedevicesareupandrunningasfastaspossiblea

FastWake-upfunctionisprovided,whichallowsfSUB,namelyeithertheLXTorLIRCoscillator,to

actasatemporaryclocktofirstdrivethesystemuntiltheoriginalsystemoscillatorhasstabilised.As

theclocksourcefortheFastWake-upfunctionisfSUB,theFastWake-upfunctionisonlyavailablein

theSLEEP1andIDLE0modes.WhenthesedevicesarewokenupfromtheSLEEP0mode,theFast

Wake-upfunctionhasnoeffectbecausethefSUBclockisstopped.TheFastWake-upenable/disable

functioniscontrolledusingtheFSTENbitintheSMODregister.

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

10�� HXT �y�les

1~� HXT �y�les

10�� HXT �y�les

1~� 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~� HXT �y�les

HIRC

15~1� HIRC �y�les 15~1� HIRC �y�les

1~� HIRC �y�les

LIRC

1~� LIRC �y�les

LXT

10�� LXT �y�les

1~� LXT �y�les

"x": don’t �a�e

Wake-Up Times

NotethatiftheWatchdogTimerisdisabled,whichmeansthattheLXTandLIRCareallbothoff,

thentherewillbenoFastWake-upfunctionavailablewhenthesedeviceswake-upfromtheSLEEP0

Mode.

HT67F5650 Datasheet(PDF) 66 Page - Holtek Semiconductor Inc

HT67F5650 Datasheet(HTML) 66 Page - Holtek Semiconductor Inc

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