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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT67F4892 датащи(PDF) 39 Page - Holtek Semiconductor Inc |
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HT67F4892 датащи(HTML) 39 Page - Holtek Semiconductor Inc |
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39 / 188 page  Rev. 1.00 38 �ove��e� ��� �01� Rev. 1.00 39 �ove��e� ��� �01� HT67F4892 Enhanced A/D Flash MCU with LCD & EEPROM HT67F4892 Enhanced A/D Flash MCU with LCD & EEPROM External High Speed Crystal Oscillator – HXT ThesimpleconnectionofacrystalacrossOSC1andOSC2willcreatethenecessaryphaseshiftand feedbackforoscillation.However,forsomecrystalsandmostresonatortypes,toensureoscillation andaccuratefrequencygeneration,itisnecessarytoaddtwosmallvalueexternalcapacitors,C1and C2.TheexactvaluesofC1andC2shouldbeselectedinconsultationwiththecrystalorresonator manufacturer’sspecification.Anadditionalconfigurationoptionmustbesetuptoconfigurethe deviceaccordingtowhethertheoscillatorfrequencyishigh,definedasequaltoorabove1MHz,or low,whichisdefinedasbelow1MHz. Foroscillatorstabilityandtominimisetheeffectsofnoiseandcrosstalk,itisimportanttoensure thatthecrystalandanyassociatedresistorsandcapacitorsalongwithinterconnectinglinesareall locatedasclosetotheMCUaspossible. �ote: 1. RP is normally not required. C1 and C� are required. �. Although not shown OSC1/OSC� pins have a pa�asitic capacitance of a�ound 7pF. To inte�nal ci�cuits Internal Oscillator Circuit C1 C� OSC1 OSC� RF RP Crystal/Resonator Oscillator – HXT HXT Oscillator C1 and C2 Values Crystal Frequency C1 C2 1�MHz 0 pF 0 pF 8MHz 0 pF 0 pF �MHz 0 pF 0 pF 1MHz 100 pF 100 pF �55kHz (�ote �) 100 pF 100 pF �ote: 1. C1 and C� values a�e fo� guidance only. 2. HXT mode configuration option: 455kHz. Crystal Recommended Capacitor Values Internal RC Oscillator – HIRC TheinternalRCoscillatorisafullyintegratedsystemoscillatorrequiringnoexternalcomponents. The internal RC oscillator has a fixed frequency of 8MHz. Device trimming during the manufacturingprocessandtheinclusionofinternalfrequencycompensationcircuitsareusedto ensurethattheinfluenceofthepowersupplyvoltage,temperatureandprocessvariationsonthe oscillationfrequencyareminimised.Notethatifthisinternalsystemclockoptionisselected,asit requiresnoexternalpinsforitsoperation,I/OpinsarefreeforuseasnormalI/Opins. |
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