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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT67F5652 데이터시트(PDF) 47 Page - Holtek Semiconductor Inc |
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HT67F5652 데이터시트(HTML) 47 Page - Holtek Semiconductor Inc |
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47 / 224 page  Rev. 1.00 4� De�e��e� 0�� �01� Rev. 1.00 4� De�e��e� 0�� �01� HT67F5652 24-Bit Delta Sigma A/D + LCD Flash MCU HT67F5652 24-Bit Delta Sigma A/D + LCD Flash MCU Oscillators Variousoscillatoroptionsoffertheuserawiderangeoffunctionsaccordingtotheirvarious applicationrequirements.Theflexiblefeaturesoftheoscillatorfunctionsensurethatthebest optimisationcanbeachievedintermsofspeedandpowersaving.Oscillatorselectionsandoperation areselectedthroughacombinationofconfigurationoptionsandregisters. Oscillator Overview Inadditiontobeingthesourceofthemainsystemclocktheoscillatorsalsoprovideclocksources fortheWatchdogTimerandTimeBaseInterrupts.Externaloscillatorsrequiringsomeexternal componentsaswellasfullyintegratedinternaloscillators,requiringnoexternalcomponents, areprovidedtoformawiderangeofbothfastandslowsystemoscillators.Alloscillatoroptions areselectedthroughtheconfigurationoptions.Thehigherfrequencyoscillatorsprovidehigher performancebutcarrywithitthedisadvantageofhigherpowerrequirements,whiletheopposite isofcoursetrueforthelowerfrequencyoscillators.Withthecapabilityofdynamicallyswitching betweenfastandslowsystemclock,thedevicehastheflexibilitytooptimizetheperformance/ powerratio,afeatureespeciallyimportantinpowersensitiveportableapplications. Type Name Frequency Pins Exte�nal C�ystal HXT 400kHz~1�MHz OSC1/OSC� Inte�nal High Speed RC HIRC 4.915�� 4.915�×� o� 4.915�×3MHz — Exte�nal Low Speed C�ystal LXT 3�.��8kHz XT1/XT� Inte�nal Low Speed RC LIRC 3�kHz — Oscillator Types System Clock Configurations Therearefourmethodsofgeneratingthesystemclock,twohighspeedoscillatorsandtwolowspeed oscillators.Thehighspeedoscillatorsaretheexternalcrystaloscillatorandtheinternal4.9152MHz, 4.9152×2MHzor4.9152×3MHzRCoscillator.Thetwolowspeedoscillatorsaretheinternal32kHz RCoscillatorandtheexternal32.768kHzcrystaloscillator.Selectingwhethertheloworhighspeed oscillatorisusedasthesystemoscillatorisimplementedusingtheHLCLKbitandCKS2~CKS0 bitsintheSMODregisterandasthesystemclockcanbedynamicallyselected. Theactualsourceclockusedforeachofthehighspeedandlowspeedoscillatorsischosen viaconfigurationoptions.Thefrequencyoftheslowspeedorhighspeedsystemclockisalso determinedusingtheHLCLKbitandCKS2~CKS0bitsintheSMODregister.Notethattwo oscillatorselectionsmustbemadenamelyonehighspeedandonelowspeedsystemoscillators.Itis notpossibletochooseano-oscillatorselectionforeitherthehighorlowspeedoscillator. |
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