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HT45R4U датащи(PDF) 73 Page - Holtek Semiconductor Inc |
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HT45R4U датащи(HTML) 73 Page - Holtek Semiconductor Inc |
73 / 105 page Rev. 1.10 7� �a��� 1�� �01� Rev. 1.10 73 �a��� 1�� �01� HT45R4U TinyPowerTM A/D Type e-Banking ASSP OTP MCU with LCD Foroscillatorstabilityandtominimisetheeffectsofnoiseandcrosstalk,itisimportanttoensure thatthecrystalandanyassociatedresistorsandcapacitorsalongwithinterconnectinglinesareall locatedasclosetotheMCUaspossible. OS C1 OS C2 Rf To i nt er nal ci rc ui ts In te rn al O sci ll at or Ci rc ui t C1 C2 Rp No te :1 . Rp i s nor ma ll y not r equi r ed. C 1 and C2 a re r equ ir ed. 2. A lt hough not s how n OS C1 /O SC 2 pi ns h av e a pa ra si ti c c apac it an ce o f a r ound 7pF . Crystal/Resonator Oscillator – HXT Internal High Speed RC Oscillator – HIRC TheinternalRCoscillatorisafullyintegratedsystemoscillatorrequiringnoexternalcomponents. TheinternalRCoscillatorhasthreefixedfrequenciesof4MHz.Devicetrimmingduringthe manufacturingprocessandtheinclusionofinternalfrequencycompensationcircuitsareusedto ensurethattheinfluenceofthepowersupplyvoltage,temperatureandprocessvariationsonthe oscillationfrequencyareminimised.Asaresult,atapowersupplyof3Vandatatemperatureof 25˚Cdegrees,thefixedoscillationfrequencyof4MHzwillhaveaspecifictolerancedescribedin theA.C.Characteristics.Notethatifthisinternalsystemclockoptionisselected,asitrequiresno externalpinsforitsoperation,I/OpinsPB0andPB1arefreeforuseasnormalI/Opins. External 32.768kHz Crystal Oscillator – LXT TheExternal32.768kHzCrystalSystemOscillatoristhelowfrequencyoscillator.Thisclocksource hasafixedfrequencyof32.768kHzandrequiresa32.768kHzcrystaltobeconnectedbetween pinsXT1andXT2.Theexternalresistorandcapacitorcomponentsconnectedtothe32.768kHz crystalarenecessarytoprovideoscillation.Forapplicationswhereprecisefrequenciesareessential, thesecomponentsmayberequiredtoprovidefrequencycompensationduetodifferentcrystal manufacturingtolerances.Duringpower-upthereisatimedelayassociatedwiththeLXToscillator waitingforittostart-up. WhenthemicrocontrollerenterstheSLEEPorIDLEMode,thesystemclockisswitchedofftostop microcontrolleractivityandtoconservepower.However,inmanymicrocontrollerapplications itmaybenecessarytokeeptheinternaltimersoperationalevenwhenthemicrocontrollerisin theSLEEPorIDLEMode.Todothis,anotherclock,independentofthesystemclock,mustbe provided. However,forsomecrystals,toensureoscillationandaccuratefrequencygeneration,itisnecessary toaddtwosmallvalueexternalcapacitors,C1andC2.TheexactvaluesofC1andC2shouldbe selectedinconsultationwiththecrystalorresonatormanufacturer’sspecification.Theexternal parallelfeedbackresistor,RP2,isrequired. 32768Hz Oscillator C1 and C2 Values Crystal Frequency C3 C4 3�768Hz 8pF 10pF Note: 1. C3 and C4 values a�e fo� guidan�e only. �. RP�=5M~10MΩ is recommended. 32768 Hz Crystal Recommended Capacitor Values |
Аналогичный номер детали - HT45R4U |
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Аналогичное описание - HT45R4U |
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