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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT45F75 датащи(PDF) 43 Page - Holtek Semiconductor Inc |
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HT45F75 датащи(HTML) 43 Page - Holtek Semiconductor Inc |
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43 / 190 page  Rev. 1.10 �� De�e��e� 1�� �01� Rev. 1.10 �3 De�e��e� 1�� �01� HT45F75 Body Fat Scale Flash MCU HT45F75 Body Fat Scale Flash MCU High Speed Os�illato� High Speed Os�illato� Configu�ation Option �-stage P�es�ale� fH fH/� fH/� fH/8 fH/1� fH/3� fH/�� HLCLK� CKS�~CKS0 �its fSYS Fast Wake-up f�o� SLEEP Mode o� IDLE Mode Cont�ol (fo� HXT only) Low Speed Os�illato� Low Speed Os�illato� Configu�ation Option fSUB fSUB HXT HIRC LIRC LXT 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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