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HT66F20 Datasheet(PDF) 60 Page - Holtek Semiconductor Inc |
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HT66F20 Datasheet(HTML) 60 Page - Holtek Semiconductor Inc |
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60 / 298 page  Rev. 1.90 60 �e���a�� 18� �01� Rev. 1.90 61 �e���a�� 18� �01� 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 • IDLE0Mode TheIDLE0ModeisenteredwhenaHALTinstructionisexecutedandwhentheIDLENbitin theSMODregisterishighandtheFSYSONbitintheWDTCregisterislow.IntheIDLE0Mode thesystemoscillatorwillbeinhibitedfromdrivingtheCPUbutsomeperipheralfunctionswill remainoperationalsuchastheWatchdogTimer,TMsandSIM.IntheIDLE0Mode,thesystem oscillatorwillbestopped.IntheIDLE0ModetheWatchdogTimerclock,fS,willeitherbeonor offdependinguponthefSclocksource.IfthesourceisfSYS/4thenthefSclockwillbeoff,andif thesourcecomesfromfSUBthenfSwillbeon. • IDLE1Mode TheIDLE1ModeisenteredwhenanHALTinstructionisexecutedandwhentheIDLENbit intheSMODregisterishighandtheFSYSONbitintheWDTCregisterishigh.IntheIDLE1 ModethesystemoscillatorwillbeinhibitedfromdrivingtheCPUbutmaycontinuetoprovidea clocksourcetokeepsomeperipheralfunctionsoperationalsuchastheWatchdogTimer,TMsand SIM.IntheIDLE1Mode,thesystemoscillatorwillcontinuetorun,andthissystemoscillator maybehighspeedorlowspeedsystemoscillator.IntheIDLE1ModetheWatchdogTimer clock,fS,willbeon.IfthesourceisfSYS/4thenthefSclockwillbeon,andifthesourcecomes fromfSUBthenfSwillbeon. Control Register Asingleregister,SMOD,isusedforoverallcontroloftheinternalclockswithinthedevice. SMOD Register Bit 7 6 5 4 3 2 1 0 Name CKS� CKS1 CKS0 �STEN 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:ThesystemclockselectionwhenHLCLKis"0" 000:fL(fLXTorfLIRC) 001:fL(fLXTorfLIRC) 010:fH/64 011:fH/32 100:fH/16 101:fH/8 110:fH/4 111:fH/2 Thesethreebitsareusedtoselectwhichclockisusedasthesystemclocksource.In additiontothesystemclocksource,whichcanbeeithertheLXTorLIRC,adivided versionofthehighspeedsystemoscillatorcanalsobechosenasthesystemclock source. Bit4 FSTEN:FastWake-upControl(onlyforHXT) 0:Disable 1:Enable ThisistheFastWake-upControlbitwhichdeterminesifthefSUBclocksourceis initiallyusedafterthedevicewakesup.Whenthebitishigh,thefSUBclocksourcecan beusedasatemporarysystemclocktoprovideafasterwakeuptimeasthefSUBclock isavailable. |
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