HT66F005 datasheet(36/109 Pages) HOLTEK

36 / 109 page

Rev. 1.30

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Rev. 1.30

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HT66F005/HT66F006

Cost-Effective A/D Flash MCU with EEPROM

HT66F005/HT66F006

Cost-Effective A/D Flash MCU with EEPROM

Bit1

IDLEN:IDLEModecontrol

0:Disable

1:Enable

ThisistheIDLEModeControlbitanddetermineswhathappenswhentheHALT

instructionisexecuted.Ifthisbitishigh,whenaHALTinstructionisexecutedthe

deviceswillentertheIDLEMode.IntheIDLE1ModetheCPUwillstoprunning

butthesystemclockwillcontinuetokeeptheperipheralfunctionsoperational,if

FSYSONbitishigh.IfFSYSONbitislow,theCPUandthesystemclockwillallstop

inIDLE0mode.IfthebitislowthedeviceswillentertheSLEEPModewhenaHALT

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

TominimisepowerconsumptionthedevicescanentertheSLEEPorIDLE0Mode,wherethe

systemclocksourcetothedeviceswillbestopped.Howeverwhenthedevicesarewokenupagain,

itcantakeaconsiderabletimefortheoriginalsystemoscillatortorestart,stabilizeandallownormal

operationtoresume.ToensurethedevicesareupandrunningasfastaspossibleaFastWake-up

functionisprovided,whichallowfLIRC,namelyLIRCoscillator,toactasatemporaryclocktofirst

drivethesystemuntiltheoriginalsystemoscillatorhasstabilised.AstheclocksourcefortheFast

Wake-upfunctionisfLIRC,theFastWake-upfunctionisonlyavailableintheSLEEP1andIDLE0

modes.WhenthedevicesarewokenupfromtheSLEEP0mode,theFastWake-upfunctionhasno

effectbecausethefLIRCclockisstopped.TheFastWake-upenable/disablefunctioniscontrolled

usingtheFSTENbitintheSMODregister.

IftheHXToscillatorisselectedastheNORMALModesystemclock,andiftheFastWake-up

functionisenabled,thenitwilltakeonetotwotLIRCclockcyclesoftheLIRCoscillatorforthe

systemtowake-up.ThesystemwilltheninitiallyrununderthefLIRCclocksourceuntil1024HXT

clockcycleshaveelapsed,atwhichpointtheHTOflagwillswitchhighandthesystemwillswitch

overtooperatingfromtheHXToscillator.

IftheHIRCoscillatorsorLIRCoscillatorisusedasthesystemoscillatorthenitwilltake15~16

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�4 HXT cyc�es

1~� HXT cyc�es

10�4 HXT cyc�es

1~� fLIRC cycles (System runs first with

fLIRC fo� 10�4 HXT cyc�es and then

switches ove� to �un with the HXT c�ock)

1~� HXT cyc�es

HIRC

15~16 HIRC cyc�es 15~16 HIRC cyc�es

1~� HIRC cyc�es

LIRC

1~� LIRC cyc�es

“x”: don’t ca�e

Wake-Up Times

NotethatiftheWatchdogTimerisdisabled,whichmeansthattheLIRCisoff,thentherewillbeno

FastWake-upfunctionavailablewhenthesedeviceswake-upfromtheSLEEP0Mode.

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