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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT45F75 데이터시트(PDF) 46 Page - Holtek Semiconductor Inc |
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HT45F75 데이터시트(HTML) 46 Page - Holtek Semiconductor Inc |
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46 / 190 page  Rev. 1.10 �� De�e��e� 1�� �01� Rev. 1.10 �7 De�e��e� 1�� �01� HT45F75 Body Fat Scale Flash MCU HT45F75 Body Fat Scale Flash MCU Supplementary Oscillators Thelowspeedoscillators,inadditiontoprovidingasystemclocksourcearealsousedtoprovide aclocksourcetootherdevicefunctions.ThesearetheWatchdogTimer,theTimeBaseInterrupts functionandtheSIM. Operating Modes and System Clocks Presentdayapplicationsrequirethattheirmicrocontrollershavehighperformancebutoftenstill demandthattheyconsumeaslittlepoweraspossible,conflictingrequirementsthatareespecially trueinbatterypoweredportableapplications.Thefastclocksrequiredforhighperformancewill bytheirnatureincreasecurrentconsumptionandofcoursevice-versa,lowerspeedclocksreduce currentconsumption.AsHoltekhasprovidedthisdevicewithbothhighandlowspeedclock sourcesandthemeanstoswitchbetweenthemdynamically,theusercanoptimisetheoperationof theirmicrocontrollertoachievethebestperformance/powerratio. System Clocks ThedevicehasmanydifferentclocksourcesforboththeCPUandperipheralfunctionoperation. Byprovidingtheuserwithawiderangeofclockoptionsusingconfigurationoptionsandregister programming,aclocksystemcanbeconfiguredtoobtainmaximumapplicationperformance. Themainsystemclock,cancomefromeitherahighfrequencyfHorlowfrequencyfSUBsource,and isselectedusingtheHLCLKbitandCKS2~CKS0bitsintheSMODregister.Thehighspeedsystem clockcanbesourcedfromeitheranHXTorHIRCoscillator,selectedviaaconfigurationoption. ThelowspeedsystemclocksourcecanbesourcedfrominternalclockfSUB.IffSUBisselectedthenit canbesourcedbyeithertheLXTorLIRCoscillator,selectedviaaconfigurationoption.Theother choice,whichisadividedversionofthehighspeedsystemoscillatorhasarangeoffH/2~fH/64. ThefSUBclockisusedtoprovideasubstituteclockforthemicrocontrollerjustafterawake-uphas occurredtoenablefasterwake-uptimes.ThefSUBisusedasaclocksourcefortheWatchdogtimer, theTimeBaseinterrupt,theTMsandtheSIMfunctions. |
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