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HT49CV7 데이터시트(PDF) 31 Page - Holtek Semiconductor Inc

부품명 HT49CV7
상세설명  A/D With VFD Type 8-Bit MCU
PDF  48 Pages
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제조업체  HOLTEK [Holtek Semiconductor Inc]
홈페이지  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT49CV7 데이터시트(HTML) 31 Page - Holtek Semiconductor Inc

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The following table shows the C1, C2 and R1 values corresponding to the different crystal values. (For refer-
ence only)
Crystal or Resonator
C1, C2
R1
4MHz Crystal
0pF
10k
W
4MHz Resonator
10pF
12k
W
3.58MHz Crystal
0pF
10k
W
3.58MHz Resonator
25pF
10k
W
2MHz Crystal & Resonator
25pF
10k
W
1MHz Crystal
35pF
27k
W
480kHz Resonator
300pF
9.1k
W
455kHz Resonator
300pF
10k
W
429kHz Resonator
300pF
10k
W
The function of the resistor R1 is to ensure that the oscillator will switch off should low voltage conditions
occur. Such a low voltage, as mentioned here, is one which is less than the lowest value of the MCU oper-
ating voltage. Note however that if the LVR is enabled then R1 can be removed.
HT49RV7/HT49CV7
Rev. 1.00
31
April 20, 2006



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