HT49CV9 查看數據表（PDF） - Holtek Semiconductor

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HT49CV9

A/D With VFD Type 8-Bit MCU

Holtek Semiconductor 

HT49RV9/HT49CV9

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

10kW

4MHz Resonator

10pF

12kW

3.58MHz Crystal

0pF

10kW

3.58MHz Resonator

25pF

10kW

2MHz Crystal & Resonator

25pF

10kW

1MHz Crystal

35pF

27kW

480kHz Resonator

300pF

9.1kW

455kHz Resonator

300pF

10kW

429kHz Resonator

300pF

10kW

The function of the resistor R1 is to ensure that the oscillator will switch off should low voltage condi-

tions occur. Such a low voltage, as mentioned here, is one which is less than the lowest value of the

MCU operating voltage. Note however that if the LVR is enabled then R1 can be removed.

Rev. 1.00

31

April 20, 2006

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