HT66F20 datasheet(61/298 Pages) HOLTEK

61 / 298 page

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

Bit3

LTO:Lowspeedsystemoscillatorreadyflag

0:Notready

1:Ready

Thisisthelowspeedsystemoscillatorreadyflagwhichindicateswhenthelowspeed

systemoscillatorisstableafterpoweronresetorawake-uphasoccurred.Theflag

willbelowwhenintheSLEEP0Modebutafterawake-uphasoccurred,theflagwill

changetoahighlevelafter1024clockcyclesiftheLXToscillatorisusedand1~2

clockcyclesiftheLIRCoscillatorisused.

Bit2

HTO:Highspeedsystemoscillatorreadyflag

0:Notready

1:Ready

Thisisthehighspeedsystemoscillatorreadyflagwhichindicateswhenthehighspeed

systemoscillatorisstable.Thisflagisclearedto"0"byhardwarewhenthedeviceis

poweredonandthenchangestoahighlevelafterthehighspeedsystemoscillatoris

stable.Thereforethisflagwillalwaysbereadas"1"bytheapplicationprogramafter

devicepower-on.TheflagwillbelowwhenintheSLEEPorIDLE0Modebutafter

awake-uphasoccurred,theflagwillchangetoahighlevelafter1024clockcyclesif

theHXToscillatorisusedandafter15~16clockcyclesiftheERCorHIRCoscillator

isused.

bit1

IDLEN:IDLEModecontrol

0:Disable

1:Enable

ThisistheIDLEModeControlbitanddetermineswhathappenswhentheHALT

instructionisexecuted.Ifthisbitishigh,whenaHALTinstructionisexecutedthe

devicewillentertheIDLEMode.IntheIDLE1ModetheCPUwillstoprunning

butthesystemclockwillcontinuetokeeptheperipheralfunctionsoperational,if

FSYSONbitishigh.IfFSYSONbitislow,theCPUandthesystemclockwillallstop

inIDLE0mode.IfthebitislowthedevicewillentertheSLEEPModewhenaHALT

instructionisexecuted.

bit0

HLCLK:systemclockselection

0:fH/2~fH/64orfL

1:fH

ThisbitisusedtoselectifthefHclockorthefH/2~fH/64orfLclockisusedasthe

systemclock.WhenthebitishighthefHclockwillbeselectedandiflowthe

fH/2~fH/64orfLclockwillbeselected.WhensystemclockswitchesfromthefHclock

tothefLclockandthefHclockwillbeautomaticallyswitchedofftoconservepower.

HT66F20 Datasheet(PDF) 61 Page - Holtek Semiconductor Inc

HT66F20 Datasheet(HTML) 61 Page - Holtek Semiconductor Inc

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