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HT66F019 Datasheet(PDF) 42 Page - Holtek Semiconductor Inc |
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HT66F019 Datasheet(HTML) 42 Page - Holtek Semiconductor Inc |
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42 / 175 page  Rev. 1.00 4� De�e��e� 01� �01� Rev. 1.00 43 De�e��e� 01� �01� HT66F019 A/D Flash MCU with EEPROM HT66F019 A/D Flash MCU with EEPROM IDLE1 Mode TheIDLE1ModeisenteredwhenanHALTinstructionisexecutedandwhentheIDLENbitinthe SMODregisterishighandtheFSYSONbitintheCTRLregisterishigh.IntheIDLE1Modethe systemoscillatorwillbeinhibitedfromdrivingtheCPUbutmaycontinuetoprovideaclocksource tokeepsomeperipheralfunctionsoperationalsuchastheWatchdogTimerandTMs.IntheIDLE1 Mode,thesystemoscillatorwillcontinuetorun,andthissystemoscillatormaybehighspeedorlow speedsystemoscillator. Control Registers Asingleregister,SMOD,isusedforoverallcontroloftheinternalclockswithinthedevice. • SMOD Register Bit 7 6 5 4 3 2 1 0 Na�e CKS� CKS1 CKS0 FSTEN LTO HTO IDLEN HLCLK R/W R/W R/W R/W R/W R R R/W R/W POR 0 0 0 0 0 0 1 1 Bit7~5 CKS2~CKS0:SystemclockselectionwhenHLCLKis"0" 000:fSUB(fLXTorfLIRC) 001:fSUB(fLXTorfLIRC) 010:fH/64 011:fH/32 100:fH/16 101:fH/8 110:fH/4 111:fH/2 Thesethreebitsareusedtoselectwhichclockisusedasthesystemclocksource.In additiontothesystemclocksource,whichcanbeeithertheLXTorLIRC,adivided versionofthehighspeedsystemoscillatorcanalsobechosenasthesystemclocksource. Bit4 FSTEN:FastWake-upControl(onlyforHXT) 0:Disable 1:Enable ThisistheFastWake-upControlbitwhichdeterminesifthefSUBclocksourceis initiallyusedafterthedevicewakesup.Whenthebitishigh,thefSUBclocksourcecan beusedasatemporarysystemclocktoprovideafasterwakeuptimeasthefSUBclock isavailable. Bit3 LTO:Lowsystemoscillatorreadyflag 0:Notready 1:Ready Thisisthelowspeedsystemoscillatorreadyflagwhichindicateswhenthelowspeed systemoscillatorisstableafterpoweronresetorawake-uphasoccurred.Theflag willbelowwhenintheSLEEP0Modebutafterawake-uphasoccurred,theflagwill changetoahighlevelafter128clockcyclesiftheLXToscillatorisusedand1~2 clockcyclesiftheLIRCoscillatorisused. Bit2 HTO:Highsystemoscillatorreadyflag 0:Notready 1:Ready Thisisthehighspeedsystemoscillatorreadyflagwhichindicateswhenthehighspeed systemoscillatorisstable.Thisflagisclearedto"0"byhardwarewhenthedeviceis poweredonandthenchangestoahighlevelafterthehighspeedsystemoscillatorisstable. Thereforethisflagwillalwaysbereadas"1"bytheapplicationprogramafterdevice power-on.TheflagwillbelowwhenintheSLEEPorIDLE0Modebutafterawake- uphasoccurred,theflagwillchangetoahighlevelafter128clockcyclesiftheHXT oscillatorisusedandafter15~16clockcyclesiftheHIRCoscillatorisused |
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