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HT66F20 Datasheet(PDF) 51 Page - Holtek Semiconductor Inc |
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HT66F20 Datasheet(HTML) 51 Page - Holtek Semiconductor Inc |
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51 / 298 page  Rev. 1.90 50 �e���a�� 18� �01� Rev. 1.90 51 �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 Oscillator Variousoscillatoroptionsoffertheuserawiderangeoffunctionsaccordingtotheirvarious applicationrequirements.Theflexiblefeaturesoftheoscillatorfunctionsensurethatthebest optimisationcanbeachievedintermsofspeedandpowersaving.Oscillatorselectionsandoperation areselectedthroughacombinationofconfigurationoptionsandregisters. Oscillator Overview Inadditiontobeingthesourceofthemainsystemclocktheoscillatorsalsoprovideclocksources fortheWatchdogTimerandTimeBaseInterrupts.Externaloscillatorsrequiringsomeexternal componentsaswellasfullyintegratedinternaloscillators,requiringnoexternalcomponents, areprovidedtoformawiderangeofbothfastandslowsystemoscillators.Alloscillatoroptions areselectedthroughtheconfigurationoptions.Thehigherfrequencyoscillatorsprovidehigher performancebutcarrywithitthedisadvantageofhigherpowerrequirements,whiletheopposite isofcoursetrueforthelowerfrequencyoscillators.Withthecapabilityofdynamicallyswitching betweenfastandslowsystemclock,thedevicehastheflexibilitytooptimizetheperformance/power ratio,afeatureespeciallyimportantinpowersensitiveportableapplications. Type Name Freq. Pins Exte�nal C��stal HXT 400kHz~�0MHz OSC1/OSC� Exte�nal RC ERC 8MHz OSC1 Inte�nal High Speed RC HIRC 4� 8 o� 1�MHz — Exte�nal Low Speed C��stal LXT ��.768kHz XT1/XT� Inte�nal Low Speed RC LIRC ��kHz — Oscillator Types System Clock Configurations Therearefivemethodsofgeneratingthesystemclock,threehighspeedoscillatorsandtwolow speedoscillators.Thehighspeedoscillatorsaretheexternalcrystal/ceramicoscillator,external RCnetworkoscillatorandtheinternal4MHz,8MHzor12MHzRCoscillator.Thetwolowspeed oscillatorsaretheinternal32kHzRCoscillatorandtheexternal32.768kHzcrystaloscillator. Selectingwhethertheloworhighspeedoscillatorisusedasthesystemoscillatorisimplemented usingtheHLCLKbitandCKS2~CKS0bitsintheSMODregisterandasthesystemclockcanbe dynamicallyselected. Theactualsourceclockusedforeachofthehighspeedandlowspeedoscillatorsischosen viaconfigurationoptions.Thefrequencyoftheslowspeedorhighspeedsystemclockisalso determinedusingtheHLCLKbitandCKS2~CKS0bitsintheSMODregister.Notethattwo oscillatorselectionsmustbemadenamelyonehighspeedandonelowspeedsystemoscillators.Itis notpossibletochooseano-oscillatorselectionforeitherthehighorlowspeedoscillator. |
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