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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT45F4M 데이터시트(PDF) 31 Page - Holtek Semiconductor Inc |
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HT45F4M 데이터시트(HTML) 31 Page - Holtek Semiconductor Inc |
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31 / 138 page  Rev. 1.10 �0 �an�a�� 1�� �01� Rev. 1.10 �1 �an�a�� 1�� �01� HT45F4M Lithium Battery Backup Power ASSP MCU HT45F4M Lithium Battery Backup Power ASSP 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 �0MHz Inte�nal Low Speed RC LIRC ��kHz 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 Oscillato� HIRC LIRC Low Speed Oscillato� fH 6-stage P�escale� HLCLK� CKS�~CKS0 bits fH/� fH/4 fH/8 fH/16 fH/�� fH/64 fSUB fSYS System Clock Configurations |
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