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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT67F5652 датащи(PDF) 49 Page - Holtek Semiconductor Inc |
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HT67F5652 датащи(HTML) 49 Page - Holtek Semiconductor Inc |
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49 / 224 page  Rev. 1.00 48 De�e��e� 0�� �01� Rev. 1.00 49 De�e��e� 0�� �01� HT67F5652 24-Bit Delta Sigma A/D + LCD Flash MCU HT67F5652 24-Bit Delta Sigma A/D + LCD Flash MCU Crystal Oscillator C1 and C2 Values Crystal Frequency C1 C2 1�MHz 0pF 0pF 1�MHz 0pF 0pF 8MHz 0pF 0pF 4MHz 0pF 0pF 1MHz 100pF 100pF Note: C1 and C� values a�e fo� guidan�e only. Crystal Recommended Capacitor Values Internal RC Oscillator – HIRC TheinternalRCoscillatorisafullyintegratedsystemoscillatorrequiringnoexternalcomponents. TheinternalRCoscillatorhasthreefixedfrequenciesofeither4.9152MHz,4.9152×2MHzor 4.9152×3MHz.Devicetrimmingduringthemanufacturingprocessandtheinclusionofinternal frequencycompensationcircuitsareusedtoensurethattheinfluenceofthepowersupplyvoltage, temperatureandprocessvariationsontheoscillationfrequencyareminimised.Notethatifthis internalsystemclockoptionisselected,asitrequiresnoexternalpinsforitsoperation,I/OpinsPB1 andPB2arefreeforuseasnormalI/Opins. Internal 32kHz Oscillator – LIRC TheInternal32kHzSystemOscillatorisoneofthelowfrequencyoscillatorchoices,whichis selectedviaconfigurationoption.ItisafullyintegratedRCoscillatorwithatypicalfrequencyof 32kHzat5V,requiringnoexternalcomponentsforitsimplementation.Devicetrimmingduring themanufacturingprocessandtheinclusionofinternalfrequencycompensationcircuitsareused toensurethattheinfluenceofthepowersupplyvoltage,temperatureandprocessvariationsonthe oscillationfrequencyareminimised. External 32.768kHz Crystal Oscillator – LXT TheExternal32.768kHzCrystalSystemOscillatorisoneofthelowfrequencyoscillatorchoices, whichisselectedviaconfigurationoption.Thisclocksourcehasafixedfrequencyof32.768kHz andrequiresa32.768kHzcrystaltobeconnectedbetweenpinsXT1andXT2.Theexternalresistor andcapacitorcomponentsconnectedtothe32.768kHzcrystalarenecessarytoprovideoscillation. Forapplicationswhereprecisefrequenciesareessential,thesecomponentsmayberequiredto providefrequencycompensationduetodifferentcrystalmanufacturingtolerances.Duringpower-up thereisatimedelayassociatedwiththeLXToscillatorwaitingforittostart-up. WhenthemicrocontrollerenterstheSLEEPorIDLEMode,thesystemclockisswitchedofftostop microcontrolleractivityandtoconservepower.However,inmanymicrocontrollerapplicationsit maybenecessarytokeeptheinternaltimersoperationalevenwhenthemicrocontrollerisinthe SLEEPorIDLEMode.Todothis,anotherclock,independentofthesystemclock,mustbeprovided. However,forsomecrystals,toensureoscillationandaccuratefrequencygeneration,itisnecessary toaddtwosmallvalueexternalcapacitors,C1andC2.TheexactvaluesofC1andC2should beselectedinconsultationwiththecrystalorresonatormanufacturerspecification.Theexternal parallelfeedbackresistor,RP,isrequired. SomeconfigurationoptionsdetermineiftheXT1/XT2pinsareusedfortheLXToscillatororasI/Opins. • IftheLXToscillatorisnotusedforanyclocksource,theXT1/XT2pinscanbeusedasnormal I/Opins. • IftheLXToscillatorisusedforanyclocksource,the32.768kHzcrystalshouldbeconnectedto theXT1/XT2pins. |
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