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HT66F0176 Datasheet(PDF) 39 Page - Holtek Semiconductor Inc |
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HT66F0176 Datasheet(HTML) 39 Page - Holtek Semiconductor Inc |
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39 / 165 page  Rev. 1.20 3� ����st 2�� 201� Rev. 1.20 39 ����st 2�� 201� HT66F0176 A/D Flash MCU with EEPROM HT66F0176 A/D Flash MCU with EEPROM Internal High Speed RC Oscillator – HIRC TheinternalRCoscillatorisafullyintegratedsystemoscillatorrequiringnoexternalcomponents. TheinternalRCoscillatorhasthreefixedfrequenciesof8MHz,12MHzand16MHz.Device trimmingduringthemanufacturingprocessandtheinclusionofinternalfrequencycompensation circuitsareusedtoensurethattheinfluenceofthepowersupplyvoltage,temperatureandprocess variationsontheoscillationfrequencyareminimised.Asaresult,atapowersupplyofeither3V or5Vandatatemperatureof25°Cdegrees,thefixedoscillationfrequencyof8MHz,12MHzor 16MHzwillhaveatolerancewithin1%.Notethatifthisinternalsystemclockoptionisselected,as itrequiresnoexternalpinsforitsoperation,I/OpinsarefreeforuseasnormalI/Opins. External 32.768 kHz Crystal Oscillator – LXT TheExternal32.768kHzCrystalSystemOscillatorisoneofthelowfrequencyoscillatorchoices, whichisselectedviaconfigurationoption.Thisclocksourcehasafixedfrequencyof32.768kHz andrequiresa32.768kHzcrystaltobeconnectedbetweenpinsXT1andXT2.Theexternalresistor andcapacitorcomponentsconnectedtothe32.768kHzcrystalarenecessarytoprovideoscillation. Forapplicationswhereprecisefrequenciesareessential,thesecomponentsmayberequiredto providefrequencycompensationduetodifferentcrystalmanufacturingtolerances.Duringpower-up thereisatimedelayassociatedwiththeLXToscillatorwaitingforittostart-up. WhenthemicrocontrollerenterstheSLEEPorIDLEMode,thesystemclockisswitchedofftostop microcontrolleractivityandtoconservepower.However,inmanymicrocontrollerapplications itmaybenecessarytokeeptheinternaltimersoperationalevenwhenthemicrocontrollerisin theSLEEPorIDLEMode.Todothis,anotherclock,independentofthesystemclock,mustbe provided. However,forsomecrystals,toensureoscillationandaccuratefrequencygeneration,itisnecessary toaddtwosmallvalueexternalcapacitors,C1andC2.TheexactvaluesofC1andC2should beselectedinconsultationwiththecrystalorresonatormanufacturerspecification.Theexternal parallelfeedbackresistor,RP,isrequired. SomeconfigurationoptionsdetermineiftheXT1/XT2pinsareusedfortheLXToscillatororasI/O orotherpin-sharedfunctionalpins. • IftheLXToscillatorisnotusedforanyclocksource,theXT1/XT2pinscanbeusedasnormalI/O orotherpin-sharedfunctionalpins. • IftheLXToscillatorisusedforanyclocksource,the32.768kHzcrystalshouldbeconnectedto theXT1/XT2pins. Foroscillatorstabilityandtominimisetheeffectsofnoiseandcrosstalk,itisimportanttoensure thatthecrystalandanyassociatedresistorsandcapacitorsalongwithinterconnectinglinesareall locatedasclosetotheMCUaspossible. Note: 1. RP� C1 and C2 are req�ired. 2. �ltho��h not shown XT1/XT2 pins have a parasitic capacitance of aro�nd �pF. To internal circ�its Internal Oscillator Circuit C1 C2 XT1 XT2 RP 32.�6� kHz Internal RC Oscillator External LXT Oscillator |
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