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数据搜索系统，热门电子元器件搜索 |
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HT45F56 数据表(PDF) 29 Page - Holtek Semiconductor Inc |
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HT45F56 数据表(HTML) 29 Page - Holtek Semiconductor Inc |
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29 / 90 page  Rev. 1.11 28 April 11, 2017 Rev. 1.11 29 April 11, 2017 HT45F56 Shock Detector Flash MCU HT45F56 Shock Detector Flash MCU Internal High Speed RC Oscillator – HIRC TheinternalRCoscillatorisafullyintegratedsystemoscillatorrequiringnoexternalcomponents. TheinternalRCoscillatorhasafixedfrequencyof8MHz.Devicetrimmingduringthe manufacturingprocessandtheinclusionofinternalfrequencycompensationcircuitsareusedto ensurethattheinfluenceofthepowersupplyvoltage,temperatureandprocessvariationsonthe oscillationfrequencyareminimised.Asaresult,atapowersupplyof5Vandatatemperatureof 25°Cdegrees,thefixedoscillationfrequencyof8MHzwillhaveatolerancewithin2%. Internal 32kHz Oscillator – LIRC TheInternal32kHzSystemOscillatoristhelowfrequencyoscillatorchoicesandfullyintegrated withatypicalfrequencyof32kHzat5V,requiringnoexternalcomponentsforitsimplementation. Devicetrimmingduringthemanufacturingprocessandtheinclusionofinternalfrequency compensationcircuitsareusedtoensurethattheinfluenceofthepowersupplyvoltage,temperature andprocessvariationsontheoscillationfrequencyareminimised. Supplementary Oscillators Thelowspeedoscillator,inadditiontoprovidingasystemclocksourceisalsousedtoprovide aclocksourcetotwootherdevicefunctions.ThesearetheWatchdogTimerandtheTimeBase Interrupts. Operating Modes and System Clocks Presentdayapplicationsrequirethattheirmicrocontrollershavehighperformancebutoftenstill demandthattheyconsumeaslittlepoweraspossible,conflictingrequirementsthatareespecially trueinbatterypoweredportableapplications.Thefastclocksrequiredforhighperformancewill bytheirnatureincreasecurrentconsumptionandofcoursevice-versa,lowerspeedclocksreduce currentconsumption.AsHoltekhasprovidedthesedeviceswithbothhighandlowspeedclock sourcesandthemeanstoswitchbetweenthemdynamically,theusercanoptimisetheoperationof theirmicrocontrollertoachievethebestperformance/powerratio. System Clocks ThedevicehasdifferentclocksourcesforboththeCPUandperipheralfunctionoperation.By providingtheuserwithawiderangeofclockselectionsusingregisterprogramming,aclocksystem canbeconfiguredtoobtainmaximumapplicationperformance. ThemainsystemclockcancomefromeitherahighfrequencyfHorlowfrequencyfSUBsourceand isselectedusingtheHLCLKandCKS2~CKS0bitsintheSMODregister.Thehighspeedsystem clockissourcedfromtheHIRCoscillatorwhilethelowspeedsystemclocksourceissourced fromtheinternalclockfSUB.Theotherchoice,whichisadividedversionofthehighspeedsystem oscillatorhasarangeoffH/2~fH/64. Thereisoneadditionalinternalclockfortheperipheralcircuits,theTimeBaseclock,fTBC.ThefTBC clockissourcedfromtheLIRCoscillatorandusedasasourcefortheTimeBaseinterruptfunctions andfortheTM. |
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