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HT66F20 Datasheet(PDF) 62 Page - Holtek Semiconductor Inc

Part # HT66F20
Description  Enhanced A/D Flash Type 8-Bit MCU with EEPROM
PDF  298 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT66F20 Datasheet(HTML) 62 Page - Holtek Semiconductor Inc

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Rev. 1.90
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Rev. 1.90
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HT66F20/HT66F30/HT66F40/HT66F50/HT66F60
HT66FU30/HT66FU40/HT66FU50/HT66FU60
Enhanced A/D Flash Type 8-Bit MCU with EEPROM
HT66F20/HT66F30/HT66F40/HT66F50/HT66F60
HT66FU30/HT66FU40/HT66FU50/HT66FU60
Enhanced A/D Flash Type 8-Bit MCU with EEPROM
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.
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
0
10�4 HXT c�cles 10�4 HXT c�cles
1~� HXT c�cles
1
10�4 HXT c�cles
1~� fSUB c�cles
(S�stem ��ns with fSUB first for 1024 HXT cycles and
then switches ove� to ��n with the HXT clock )
1~� HXT c�cles
ERC
x
15~16 ERC c�cles 15~16 ERC c�cles
1~� ERC c�cles
HIRC
x
15~16 HIRC c�cles 15~16 HIRC c�cles
1~� HIRC c�cles
LIRC
x
1~� LIRC c�cles 1~� LIRC c�cles
1~� LIRC c�cles
LXT
x
10�4 LXT c�cles 10�4 LXT c�cles
1~� LXT c�cles
Wake-up Times
NotethatiftheWatchdogTimerisdisabled,whichmeansthattheLXTandLIRCareallbothoff,
thentherewillbenoFastWake-upfunctionavailablewhenthedevicewakes-upfromtheSLEEP0
Mode.



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