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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT45F2020 데이터시트(PDF) 24 Page - Holtek Semiconductor Inc |
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HT45F2020 데이터시트(HTML) 24 Page - Holtek Semiconductor Inc |
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24 / 85 page  Rev. 1.00 24 April 11, 2017 Rev. 1.00 25 April 11, 2017 HT45F2020/HT45F2022 Sound Effect Generator Flash MCU HT45F2020/HT45F2022 Sound Effect Generator Flash MCU High Speed Internal RC Oscillator – HIRC ThehighspeedinternalRCoscillatorisafullyintegratedsystemoscillatorrequiringnoexternal components.TheinternalRCoscillatorhasafixedfrequencyof8MHz.Devicetrimmingduring themanufacturingprocessandtheinclusionofinternalfrequencycompensationcircuitsareused toensurethattheinfluenceofthepowersupplyvoltage,temperatureandprocessvariationson theoscillationfrequencyareminimised.Asaresult,atapowersupplyofeither3Vor5Vandata temperatureof25°Cdegrees,thefixedoscillationfrequencyof8MHzwillhaveatolerancewithin 2%. Internal 32kHz Oscillator – LIRC Theinternal32kHzSystemOscillatoristhelowfrequencyoscillator.Itisafullyintegrated RCoscillatorwithatypicalfrequencyof32kHzat5V,requiringnoexternalcomponentsforits implementation.Devicetrimmingduringthemanufacturingprocessandtheinclusionofinternal frequencycompensationcircuitsareusedtoensurethattheinfluenceofthepowersupplyvoltage, temperatureandprocessvariationsontheoscillationfrequencyareminimised. Supplementary Oscillators Thelowspeedoscillator,inadditiontoprovidingasystemclocksourceisalsousedtoprovide aclocksourcetotwootherdevicefunctions.ThesearetheWatchdogTimerandtheTimeBase Interrupts. Operating Modes and System Clocks Presentdayapplicationsrequirethattheirmicrocontrollershavehighperformancebutoftenstill demandthattheyconsumeaslittlepoweraspossible,conflictingrequirementsthatareespecially trueinbatterypoweredportableapplications.Thefastclocksrequiredforhighperformancewill bytheirnatureincreasecurrentconsumptionandofcoursevice-versa,lowerspeedclocksreduce currentconsumption.AsHoltekhasprovidedthedevicewithbothhighandlowspeedclocksources andthemeanstoswitchbetweenthemdynamically,theusercanoptimisetheoperationoftheir microcontrollertoachievethebestperformance/powerratio. System Clocks ThedevicehasdifferentclocksourcesforboththeCPUandperipheralfunctionoperation.By providingtheuserwithawiderangeofclockselectionsusingregisterprogramming,aclocksystem canbeconfiguredtoobtainmaximumapplicationperformance. Themainsystemclock,cancomefromeitherahighfrequency,fH,orlowfrequency,fSUB,source, andisselectedusingtheCKS2~CKS0bitsintheSCCregister.Thehighspeedsystemclockis sourcedfromtheHIRCoscillator.ThelowspeedsystemclocksourcecanbesourcedfromtheLIRC oscillator.Theotherchoice,whichisadividedversionofthehighspeedsystemoscillatorhasa rangeoffH/2~fH/64. |
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