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HT45R4U датащи(PDF) 73 Page - Holtek Semiconductor Inc

номер детали HT45R4U
подробное описание детали  TinyPowerTM A/D Type e-Banking ASSP OTP MCU with LCD
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производитель  HOLTEK [Holtek Semiconductor Inc]
домашняя страница  http://www.holtek.com
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HT45R4U датащи(HTML) 73 Page - Holtek Semiconductor Inc

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Rev. 1.10
7�
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Rev. 1.10
73
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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


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