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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT45F65 데이터시트(PDF) 48 Page - Holtek Semiconductor Inc |
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HT45F65 데이터시트(HTML) 48 Page - Holtek Semiconductor Inc |
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48 / 231 page  Rev. 1.60 �8 �ove��e� ��� �01� Rev. 1.60 �9 �ove��e� ��� �01� HT45F65/HT45F66/HT45F67 Glucose Meter 8-Bit Flash MCU Internal 32kHz Oscillator – LIRC TheInternal32kHzSystemOscillatorisoneofthelowfrequencyoscillatorchoices,whichis selectedviaconfigurationoption.ItisafullyintegratedRCoscillatorwithatypicalfrequencyof 32kHzat5V,requiringnoexternalcomponentsforitsimplementation.Devicetrimmingduring themanufacturingprocessandtheinclusionofinternalfrequencycompensationcircuitsareused toensurethattheinfluenceofthepowersupplyvoltage,temperatureandprocessvariationsonthe oscillationfrequencyareminimised.Asaresult,atapowersupplyof5Vandatatemperatureof 25°Cdegrees,thefixedoscillationfrequencyof32kHzwillhaveatolerancewithin10%. Supplementary Oscillators Thelowspeedoscillators,inadditiontoprovidingasystemclocksourcearealsousedtoprovidea clocksourcetothreeotherdevicefunctions.ThesearetheWatchdogTimer,theLCDdriverandthe TimeBaseInterrupts. Operating Modes and System Clocks Presentdayapplicationsrequirethattheirmicrocontrollershavehighperformancebutoftenstill demandthattheyconsumeaslittlepoweraspossible,conflictingrequirementsthatareespecially trueinbatterypoweredportableapplications.Thefastclocksrequiredforhighperformancewill bytheirnatureincreasecurrentconsumptionandofcoursevice-versa,lowerspeedclocksreduce currentconsumption.AsHoltekhasprovidedthesedeviceswithbothhighandlowspeedclock sourcesandthemeanstoswitchbetweenthemdynamically,theusercanoptimisetheoperationof theirmicrocontrollertoachievethebestperformance/powerratio. System Clocks ThedeviceshavemanydifferentclocksourcesforboththeCPUandperipheralfunctionoperation. Byprovidingtheuserwithawiderangeofclockoptionsusingconfigurationoptionsandregister programming,aclocksystemcanbeconfiguredtoobtainmaximumapplicationperformance. Themainsystemclock,cancomefromeitherahighfrequencyfHorlowfrequencyfLsource,andis selectedusingtheHLCLKbitandCKS2~CKS0bitsintheSMOD0register.Thehighspeedsystem clockcanbesourcedfromeitheranHXT,ERCorHIRCoscillator,selectedviaaconfiguration option.ThelowspeedsystemclocksourcecanbesourcedfrominternalclockfL.IffLisselected thenitcanbesourcedbyeithertheLXTorLIRCoscillator,selectedviaaconfigurationoption. Theotherchoice,whichisadividedversionofthehighspeedsystemoscillatorhasarangeof fH/2~fH/64. Therearetwoadditionalinternalclocksfortheperipheralcircuits,thesubstituteclock,fSUB,and theTimeBaseclock,fTBC.EachoftheseinternalclocksissourcedbyeithertheLXTorLIRC oscillators,selectedviaconfigurationoptions.ThefSUBclockisusedtoprovideasubstituteclockfor themicrocontrollerjustafterawake-uphasoccurredtoenablefasterwake-uptimes. |
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