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HT45F75 데이터시트(PDF) 43 Page - Holtek Semiconductor Inc

부품명 HT45F75
상세설명  Body Fat Scale Flash MCU
PDF  190 Pages
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제조업체  HOLTEK [Holtek Semiconductor Inc]
홈페이지  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT45F75 데이터시트(HTML) 43 Page - Holtek Semiconductor Inc

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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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