HT66FU40 datasheet(53/298 Pages) HOLTEK

53 / 298 page

Rev. 1.90

5�

�e��a�� 18� �01�

Rev. 1.90

5�

�e��a�� 18� �01�

HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

Enhanced A/D Flash Type 8-Bit MCU with EEPROM

HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

Enhanced A/D Flash Type 8-Bit MCU with EEPROM

External Crystal/Ceramic Oscillator – HXT

TheExternalCrystal/CeramicSystemOscillatorisoneofthehighfrequencyoscillatorchoices,

whichisselectedviaconfigurationoption.Formostcrystaloscillatorconfigurations,thesimple

connectionofacrystalacrossOSC1andOSC2willcreatethenecessaryphaseshiftandfeedbackfor

oscillation,withoutrequiringexternalcapacitors.However,forsomecrystaltypesandfrequencies,

toensureoscillation,itmaybenecessarytoaddtwosmallvaluecapacitors,C1andC2.Usinga

ceramicresonatorwillusuallyrequiretwosmallvaluecapacitors,C1andC2,tobeconnectedas

shownforoscillationtooccur.ThevaluesofC1andC2shouldbeselectedinconsultationwiththe

crystalorresonatormanufacturersspecification.

OS C1

OS C2

To i nt er nal

ci rc ui ts

In te rn al

O sci lla to r

Ci rc ui t

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

Crystal Oscillator C1 and C2 Values

Crystal Frequency

1�MHz

0p�

8MHz

0p�

4MHz

0p�

1MHz

100p�

Note: C1 and C� val�es a�e fo� g�idance onl�.

Crystal Recommended Capacitor Values

HT66FU40 Datasheet(PDF) 53 Page - Holtek Semiconductor Inc

HT66FU40 Datasheet(HTML) 53 Page - Holtek Semiconductor Inc

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