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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT67F5630 데이터시트(PDF) 39 Page - Holtek Semiconductor Inc |
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HT67F5630 데이터시트(HTML) 39 Page - Holtek Semiconductor Inc |
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39 / 147 page  Rev. 1.20 38 De�e��e� 1�� 201� Rev. 1.20 39 De�e��e� 1�� 201� HT67F5630 TinyPowerTM 24-Bit Delta Sigma A/D Flash MCU with LCD & EEPROM HT67F5630 TinyPowerTM 24-Bit Delta Sigma A/D Flash MCU with LCD & EEPROM Operating Modes and System Clocks Presentdayapplicationsrequirethattheirmicrocontrollershavehighperformancebutoftenstill demandthattheyconsumeaslittlepoweraspossible,conflictingrequirementsthatareespecially trueinbatterypoweredportableapplications.Thefastclocksrequiredforhighperformancewill bytheirnatureincreasecurrentconsumptionandofcourseviceversa,lowerspeedclocksreduce currentconsumption.AsHoltekhasprovidedthisdevicewithbothhighandlowspeedclock sourcesandthemeanstoswitchbetweenthemdynamically,theusercanoptimisetheoperationof theirmicrocontrollertoachievethebestperformance/powerratio. System Clocks ThedevicehasmanydifferentclocksourcesforboththeCPUandperipheralfunctionoperation. Byprovidingtheuserwithawiderangeofclockoptionsusingconfigurationoptionsandregister programming,aclocksystemcanbeconfiguredtoobtainmaximumapplicationperformance. Themainsystemclock,cancomefromeitherahighfrequencyfHorlowfrequencyfSUBsource, andisselectedusingtheHLCLKbitandCKS2~CKS0bitsintheSMODregister.Thehighspeed systemclockcanbesourcedfromeitheranHXTorHIRCoscillator,selectedviaaconfiguration option.ThelowspeedsystemclocksourcecanbesourcedfrominternalclockfSUB.IffSUBisselected thenitcanbesourcedbytheLIRCoscillator.Theotherchoice,whichisadividedversionofthe highspeedsystemoscillatorhasarangeoffH/2~fH/64. ThefSUBclockisusedtoprovideasubstituteclockforthemicrocontrollerjustafterawake-uphas occurredtoenablefasterwake-uptimes.ThefSUBisusedasaclocksourcefortheWatchdogtimer, theTimeBaseinterrupt,theTMs,andtheLCDfunctions. |
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