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HT45F77 Datasheet(PDF) 44 Page - Holtek Semiconductor Inc |
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HT45F77 Datasheet(HTML) 44 Page - Holtek Semiconductor Inc |
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44 / 203 page  Rev. 1.20 �� De�e��e� 1�� 201� Rev. 1.20 �5 De�e��e� 1�� 201� HT45F77 Body Fat Scale Flash MCU HT45F77 Body Fat Scale Flash MCU HXT High Speed Os�illato� High Speed Os�illato� Configu�ation Option �-stage P�es�ale� HIRC fH fH/2 fH/� fH/8 fH/1� fH/32 fH/�� HLCLK� CKS2~CKS0 �its fSYS Fast Wake-up f�o� SLEEP Mode o� IDLE Mode Cont�ol (fo� HXT only) LIRC Low Speed Os�illato� LXT Low Speed Os�illato� Configu�ation Option fSUB fSUB 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. OS C1 OS C2 Rf To i nt er nal ci rc ui ts In te rn al O sci lla to r Ci rc ui t C1 C2 Rp No te :1 . Rp i s nor ma lly not r equi r ed. C 1 and C2 a re r equ ir ed. 2. A lt hough not s how n OS C1 /O SC 2 pi ns h av e a pa ra si ti c c apac it an ce o f a r ound 7pF . Crystal/Resonator Oscillator – HXT |
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