HT45F65 datasheet(45/231 Pages) HOLTEK

45 / 231 page

Rev. 1.60

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Rev. 1.60

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HT45F65/HT45F66/HT45F67

Glucose Meter 8-Bit Flash MCU

HX T

HI RC

LI RC

Hi gh Sp ee d

O sci lla ti on

Lo w S pee d

O sci lla ti on

f H

Hi gh Sp e ed Os c illa ti on

Co nf i gur at io n Op ti on

f H /6 4

f H /3 2

f H /1 6

f H /8

f H /4

f H /2

6- st age P re sc al er

f L

f SU B

f SYS

HL CL K,

CK S2 ~C KS 0 bi ts

Fa st W ak e- up fr om S L EEP M ode o r

ID LE M o de Co nt ro l (f or H XT o nl y)

ER C

LX T

Lo w S peed Os c illa ti on

Co nf i gur at io n Op ti on

Note:TheexternalRCoscillatoronlyexistsintheHT45F66/HT45F67.

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.

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 S C2 p in s ha ve a p ar as it ic

c apac it an ce o f a r ound 7pF .

OS C1

OS C2

Crystal/Resonator Oscillator – HXT

Crystal Oscillator C1 and C2 Values

Crystal Frequency

1�MHz

0pF

8MHz

0pF

�MHz

0pF

1MHz

100pF

�ote: C1 and C� values a�e fo� guidance only.

Crystal Recommended Capacitor Values

HT45F65 Datasheet(PDF) 45 Page - Holtek Semiconductor Inc

HT45F65 Datasheet(HTML) 45 Page - Holtek Semiconductor Inc

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