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HT66F019 Datasheet(PDF) 37 Page - Holtek Semiconductor Inc |
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HT66F019 Datasheet(HTML) 37 Page - Holtek Semiconductor Inc |
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37 / 175 page  Rev. 1.00 36 De�e��e� 01� �01� Rev. 1.00 3� De�e��e� 01� �01� HT66F019 A/D Flash MCU with EEPROM HT66F019 A/D Flash MCU with EEPROM HXT HIRC fH 6-stage P�es�ale� High Speed Os�illato�s Configu�ation Option HLCLK� CKS�~CKS0 �its fH/� fH/4 fH/8 fH/16 fH/3� fH/64 fSUB fSUB Fast Wake-up f�o� SLEEP Mode o� IDLE Mode Cont�ol (fo� HXT only) fSYS High Speed Os�illato�s LIRC LXT Low Speed Os�illato�s Configu�ation Option Low Speed Os�illato�s System Clock Configurations External Crystal/Ceramic Oscillator – HXT TheExternalCrystal/CeramicSystemOscillatorisoneofthehighfrequencyoscillatorchoices, whichisselectedviaconfigurationoption.Formostcrystaloscillatorconfigurations,thesimple connectionofacrystalacrossOSC1andOSC2willcreatethenecessaryphaseshiftandfeedbackfor oscillation,withoutrequiringexternalcapacitors.However,forsomecrystaltypesandfrequencies, toensureoscillation,itmaybenecessarytoaddtwosmallvaluecapacitors,C1andC2.Usinga ceramicresonatorwillusuallyrequiretwosmallvaluecapacitors,C1andC2,tobeconnectedas shownforoscillationtooccur.ThevaluesofC1andC2shouldbeselectedinconsultationwiththe crystalorresonatormanufacturer’sspecification. Foroscillatorstabilityandtominimisetheeffectsofnoiseandcrosstalk,itisimportanttoensure thatthecrystalandanyassociatedresistorsandcapacitorsalongwithinterconnectinglinesareall locatedasclosetotheMCUaspossible. Note: 1. RP is no��ally not �equi�ed. C1 and C� a�e �equi�ed. �. Although not shown OSC1/OSC� pins have a pa�asiti� �apa�itan�e of a�ound �pF. To inte�nal �i��uits Internal Oscillator Circuit C1 C� OSC1 OSC� RF RP Crystal/Resonator Oscillator – HXT |
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