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HT46R002 Datasheet(PDF) 22 Page - Holtek Semiconductor Inc |
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HT46R002 Datasheet(HTML) 22 Page - Holtek Semiconductor Inc |
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22 / 83 page  Rev. 1.21 22 April 11, 2017 Rev. 1.21 23 April 11, 2017 HT46R002/HT46R003 Cost-Effective A/D 8-Bit OTP MCU HT46R002/HT46R003 Cost-Effective A/D 8-Bit OTP MCU Oscillator Variousoscillatoroptionsoffertheuserawiderangeoffunctionsaccordingtotheirvarious applicationrequirements.Theflexiblefeaturesoftheoscillatorfunctionsensurethatthebest optimizationcanbeachievedintermsofspeedandpowersaving. System Oscillator Overview Inadditiontobeingthesourceofthemainsystemclocktheoscillatorsalsoprovideclocksources fortheWatchdogTimerfunction,PWMandTimer/Eventcounter. Type Name Freq. Internal High Speed RC HIRC 8MHz Internal Low Speed RC LIRC 12kHz Oscillator Types System Clock Configurations Thereisonesystemoscillatorimplementedinthesedevices,internal8MHzRC,HIRC.Alsothere isaninternal12kHzRCoscillatorLIRCusedastheclocksourcefortheWDTfunction,PWMand Timer/Eventcounter.Moredetailsaredescribedintheaccompanysections. Internal RC Oscillator – HIRC TheinternalRCoscillatorisafullyintegratedsystemoscillatorrequiringnoexternalcomponents. TheinternalRCoscillatorhasthefrequencyof8MHz.Devicetrimmingduringthemanufacturing processandtheinclusionofinternalfrequencycompensationcircuitisusedtoensurethatthe influenceofthepowersupplyvoltage,temperatureandprocessvariationsontheoscillation frequencyareminimized.Notethatthisinternalsystemclockoptionrequiresnoexternalpinsforits operation.RefertotheA.C.Characteristicsformorefrequencyaccuracydetails. Internal 12kHz Oscillator – LIRC TheLIRCisafullyself-containedfreerunningon-chipRCoscillatorwithatypicalfrequencyof 12kHzat5V,requiringnoexternalcomponentsforitsimplementation.Whenthedeviceentersthe SleepMode,thesystemclockwillstoprunningbuttheLIRCoscillatorcontinuestofree-runand tokeepthewatchdogactive.However,topreservepowerincertainapplicationstheLIRCcanbe disabledbydisablingtheWDTfunction,PWMandTimer/Eventcounter.Timer/Eventcounterand PWMfunctioninthehaltmode. |
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