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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT45F5R 데이터시트(PDF) 37 Page - Holtek Semiconductor Inc |
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HT45F5R 데이터시트(HTML) 37 Page - Holtek Semiconductor Inc |
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37 / 138 page  Rev. 1.10 �� De�e��e� 1�� �01� Rev. 1.10 �7 De�e��e� 1�� �01� HT45F5R Charger ASSP Flash MCU HT45F5R Charger ASSP Flash MCU Oscillators Variousoscillatoroptionsoffertheuserawiderangeoffunctionsaccordingtotheirvarious applicationrequirements.Theflexiblefeaturesoftheoscillatorfunctionsensurethatthebest optimisationcanbeachievedintermsofspeedandpowersaving.Oscillatorselectionsandoperation areselectedthroughrelevantcontrolregisters. Oscillator Overview Inadditiontobeingthesourceofthemainsystemclocktheoscillatorsalsoprovideclocksources fortheWatchdogTimerandTimeBaseInterrupts.Twofullyintegratedinternaloscillators,requiring noexternalcomponents,areprovidedtoformawiderangeofbothfastandslowsystemoscillators. Thehigherfrequencyoscillatorprovideshigherperformancebutcarrywithitthedisadvantageof higherpowerrequirements,whiletheoppositeisofcoursetrueforthelowerfrequencyoscillator. Withthecapabilityofdynamicallyswitchingbetweenfastandslowsystemclock,thisdevicehas theflexibilitytooptimizetheperformance/powerratio,afeatureespeciallyimportantinpower sensitiveportableapplications. Type Name Freq. Inte�nal High Speed RC HIRC 8MHz Inte�nal Low Speed RC LIRC ��kHz Oscillator Types System Clock Configurations Therearetwomethodsofgeneratingthesystemclock,ahighspeedoscillatorandalowspeed oscillator.Thehighspeedoscillatoristheinternal8MHzRCoscillator.Thelowspeedoscillatoris theinternal32kHzRCoscillator.Selectingwhethertheloworhighspeedoscillatorisusedasthe systemoscillatorisimplementedusingtheCKS2~CKS0bitsintheSCCregisterandasthesystem clockcanbedynamicallyselected. HIRCEN P�es�ale� fH High Speed Os�illato� Low Speed Os�illato� fH/� fH/1� fH/�4 fH/8 fH/4 fH/�� CKS�~CKS0 fSYS fSUB fSUB LIRC fLIRC fLIRC HIRC fH IDLE0 SLEEP IDLE� SLEEP System Clock Configurations |
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