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HT68F13 датащи(PDF) 32 Page - Holtek Semiconductor Inc |
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HT68F13 датащи(HTML) 32 Page - Holtek Semiconductor Inc |
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32 / 161 page ![]() ControlRegister A single register, SMOD, is used for overall control of the internal clocks within the device. SMOD Register Bit 7 6 5 4 3 2 1 0 Name CKS2 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:Thesystemclockselectionwhen HLCLK is ²0² 000: f L (fLIRC) 001: f L (fLIRC) 010: f H/64 011: f H/32 100: f H/16 101: f H/8 110: f H/4 111: f H/2 Thesethreebitsareusedtoselectwhichclockisusedasthesystemclocksource.Inadditionto thesystemclocksource,whichisthe LIRC,adividedversionofthehighspeedsystemoscillator canalsobechosenasthesystemclocksource. Bit4 FSTEN:FastWake-upControl(onlyfor HXT) 0:Disable 1:Enable ThisistheFastWake-upControlbitwhichdeterminesifthe f SUB clocksourceisinitiallyused afterthedevicewakesup.Whenthebitishigh,the f SUB clocksourcecanbeusedasa temporarysystemclocktoprovideafasterwakeuptimeasthe f SUB clockisavailable. Bit3 LTO:Lowspeedsystemoscillatorreadyflag 0:Notready 1:Ready Thisisthelowspeedsystemoscillatorreadyflagwhichindicateswhenthelowspeedsystem oscillatorisstableafterpoweronresetorawake-uphasoccurred.Theflagwillbelowwhenin theSLEEP0Modebutafterawake-uphasoccurred,theflagwillchangetoahighlevelafter 1~2clockcyclesasthe LIRC oscillatorisused. Bit2 HTO:Highspeedsystemoscillatorreadyflag 0:Notready 1:Ready Thisisthehighspeedsystemoscillatorreadyflagwhichindicateswhenthehighspeedsystem oscillatorisstable.Thisflagisclearedto ²0² byhardwarewhenthedeviceispoweredonand thenchangestoahighlevelafterthehighspeedsystemoscillatorisstable.Thereforethisflag willalwaysbereadas ²1² bytheapplicationprogramafterdevicepower-on.Theflagwillbelow whenintheSLEEP orIDLE0Modebutafterawake-uphasoccurred,theflagwillchangetoa highlevelafter1024clockcyclesifthe HXT oscillatorisusedandafter15~16clockcyclesifthe ERC or HIRC oscillatorisused. Bit1 IDLEN:IDLEModecontrol 0:Disable 1:Enable ThisistheIDLEModeControlbitanddetermineswhathappenswhentheHALT instructionis executed.Ifthisbitishigh,whenaHALT instructionisexecutedthedevicewillentertheIDLE Mode.IntheIDLE1ModetheCPUwillstoprunningbutthesystemclockwillcontinuetokeep theperipheralfunctionsoperationalasthe FSYSON bitishigh.If FSYSON bitislow,theCPU andthesystemclockwillallstopinIDLE0mode.IfthebitislowthedevicewillentertheSLEEP ModewhenaHALT instructionisexecuted. Rev.1.10 32 February9,2011 HT68F13/HT68F14/HT68F15 EnhancedI/OFlashType MCU |
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