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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT45F4MA 데이터시트(PDF) 35 Page - Holtek Semiconductor Inc |
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HT45F4MA 데이터시트(HTML) 35 Page - Holtek Semiconductor Inc |
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35 / 145 page  Rev. 1.20 3� De�e��e� 1�� 201� Rev. 1.20 35 De�e��e� 1�� 201� HT45F4MA/HT45FH4MA/HT45FH4MA-1 Power Bank Flash MCU HT45F4MA/HT45FH4MA/HT45FH4MA-1 Power Bank Flash MCU Oscillator Variousoscillatoroptionsoffertheuserawiderangeoffunctionsaccordingtotheirvarious applicationrequirements.Theflexiblefeaturesoftheoscillatorfunctionsensurethatthebest optimisationcanbeachievedintermsofspeedandpowersaving.Oscillatorselectionsandoperation areselectedthroughacombinationofconfigurationoptionsandregisters. Oscillator Overview Inadditiontobeingthesourceofthemainsystemclocktheoscillatorsalsoprovideclocksources fortheWatchdogTimerandTimeBaseInterrupts.Fullyintegratedinternaloscillators,requiringno externalcomponents,areprovidedtoformawiderangeofbothfastandslowsystemoscillators. Thehigherfrequencyoscillatorsprovidehigherperformancebutcarrywithitthedisadvantageof higherpowerrequirements,whiletheoppositeisofcoursetrueforthelowerfrequencyoscillators. Withthecapabilityofdynamicallyswitchingbetweenfastandslowsystemclock,thedevicehasthe flexibilitytooptimizetheperformance/powerratio,afeatureespeciallyimportantinpowersensitive portableapplications. Type Name Freq. Inte�nal High Speed RC HIRC 30MHz Inte�nal Low Speed RC LIRC 32kHz Oscillator Types System Clock Configurations Therearetwomethodsofgeneratingthesystemclock,ahighspeedoscillatorandalowspeed oscillator.Thehighspeedoscillatoristheinternal30MHzRCoscillator.Thelowspeedoscillator istheinternal32kHz(LIRC)oscillator.Selectingwhethertheloworhighspeedoscillatorisused asthesystemoscillatorisimplementedusingtheHLCLKbitandCKS2~CKS0bitsintheSMOD registerandasthesystemclockcanbedynamicallyselected. Theactualsourceclockusedforthehighspeedandthelowspeedoscillatorsischosenviaacombination ofconfigurationoptionsandregisters.Thefrequencyoftheslowspeedorhighspeedsystemclockis alsodeterminedusingtheHLCLKbitandCKS2~CKS0bitsintheSMODregister.Notethattwo oscillatorselectionsmustbemadenamelyonehighspeedandonelowspeedsystemoscillators.Itisnot possibletochooseano-oscillatorselectionforeitherthehighorlowspeedoscillator. High Speed Os�illato� HIRC LIRC Low Speed Os�illato� fH �-stage P�es�ale� HLCLK� CKS2~CKS0 �its fH/2 fH/� fH/8 fH/1� fH/32 fH/�� fSUB fSYS System Clock Configurations |
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