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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT68F005 датащи(PDF) 29 Page - Holtek Semiconductor Inc |
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HT68F005 датащи(HTML) 29 Page - Holtek Semiconductor Inc |
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29 / 93 page  Rev. 1.00 �8 ��to�e� ��� �01� Rev. 1.00 �9 ��to�e� ��� �01� HT68F005/HT68F006 Enhanced I/O Flash Type MCU HT68F005/HT68F006 Enhanced I/O Flash Type MCU Oscillators Variousoscillatoroptionsoffertheuserawiderangeoffunctionsaccordingtotheirvarious applicationrequirements.Theflexiblefeaturesoftheoscillatorfunctionsensurethatthebest optimisationcanbeachievedintermsofspeedandpowersaving.Oscillatorselectionsandoperation areselectedthroughacombinationofconfigurationoptionsandregisters. Oscillators Overview Inadditiontobeingthesourceofthemainsystemclocktheoscillatorsalsoprovideclocksources fortheWatchdogTimerandTimeBaseInterrupts.Externaloscillatorsrequiringsomeexternal componentsaswellasfullyintegratedinternaloscillators,requiringnoexternalcomponents, areprovidedtoformawiderangeofbothfastandslowsystemoscillators.Alloscillator optionsareselectedthroughtheconfigurationoptions.Thehigherfrequencyoscillatorsprovide higherperformancebutcarrywithitthedisadvantageofhigherpowerrequirements,whilethe oppositeisofcoursetrueforthelowerfrequencyoscillators.Withthecapabilityofdynamically switchingbetweenfastandslowsystemclock,thesedeviceshavetheflexibilitytooptimizethe performance/powerratio,afeatureespeciallyimportantinpowersensitiveportableapplications. Type Name Freq. Pins Exte�nal C�ystal HXT 400kHz~�0MHz �SC1/�SC� Inte�nal High Speed RC HIRC 4� 8� 1�MHz — Inte�nal Low Speed RC LIRC 3�kHz — Oscillator Types System Clock Configurations Therearethreemethodsofgeneratingthesystemclock,twohighspeedoscillatorsandonelow speedoscillator.Thehighspeedoscillatorsaretheexternalcrystal/ceramicoscillatorandtheinternal 4MHz,8MHzor12MHzRCoscillator.Thelowspeedoscillatorisaninternal32kHzRCoscillator. Selectingwhethertheloworhighspeedoscillatorisusedasthesystemoscillatorisimplemented usingtheHLCLKbitandCKS2~CKS0bitsintheSMODregisterandasthesystemclockcanbe dynamicallyselected. Theactualsourceoscillatorusedforthehighspeedsystemclockischosenusingaconfiguration option.TheOSC1andOSC2pinsareusedtoconnecttheexternalcomponentsfortheexternal crystal.Theavailableselectionsforhighspeedandlowspeedoscillatorsaretherefore:HIRC+LIRC orHXT+LIRC. External Crystal/Ceramic Oscillator – HXT TheExternalCrystal/CeramicSystemOscillatorisoneofthehighfrequencyoscillatorchoices, whichisselectedviaconfigurationoption.Formostcrystaloscillatorconfigurations,thesimple connectionofacrystalacrossOSC1andOSC2willcreatethenecessaryphaseshiftandfeedbackfor oscillation,withoutrequiringexternalcapacitors.However,forsomecrystaltypesandfrequencies, toensureoscillation,itmaybenecessarytoaddtwosmallvaluecapacitors,C1andC2.Usinga ceramicresonatorwillusuallyrequiretwosmallvaluecapacitors,C1andC2,tobeconnectedas shownforoscillationtooccur.ThevaluesofC1andC2shouldbeselectedinconsultationwiththe crystalorresonatormanufacturer'sspecification. |
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