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HT46R003B Folha de dados(PDF) 21 Page - Holtek Semiconductor Inc |
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HT46R003B Folha de dados(HTML) 21 Page - Holtek Semiconductor Inc |
21 / 76 page Rev. 1.00 �0 ��ne 1�� �01� Rev. 1.00 �1 ��ne 1�� �01� HT46R003B Cost-Effective A/D 8-bit OTP MCU HT46R003B Cost-Effective A/D 8-bit OTP MCU Oscillator Variousoscillatoroptionsoffertheuserawiderangeoffunctionsaccordingtotheirvarious applicationrequirements.Theflexiblefeaturesoftheoscillatorfunctionsensurethatthebest optimizationcanbeachievedintermsofspeedandpowersaving. System Oscillator Overview Inadditiontobeingthesourceofthemainsystemclocktheoscillatorsalsoprovideclocksources fortheWatchdogTimerfunction,PWMfunction,Timer/EventcounterandTimeBase. Type Name Freq. Internal High Speed RC HIRC 8MHz Internal Low Speed RC LIRC 1�kHz Oscillator Types System Clock Configurations Thereisonesystemoscillatorimplementedinthedevice,internal8MHzRC,HIRC.Alsothereisan internal12kHzRCoscillatorLIRCusedastheclocksourcefortheWDTfunction,PWMfunction, Timer/EventcounterandTimeBase.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,PWMfunction,Timer/EventcounterandTimeBaseinthe haltmode. |
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