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MKE04外接无源晶振,起振后用示波器测试EXTAL的波形。

Question asked by 旭余 朱 on Dec 10, 2019
Latest reply on Dec 12, 2019 by 旭余 朱

MKE04外接8M无源晶体,起振后用示波器测试EXTAL的波形,发现对地只有1V。测量其它单片机,这个脚的电压比较高,之所以关注这个电压是因为晶体厂家说无源晶体起振点是1.3V,低了会振不起来。所以想问下这是否正常。除此之外,频率这些都是正常的。

MKE04 is connected to an 8M passive crystal. After the oscillation, test the waveform of EXTAL with an oscilloscope and find that it is only 1V to the ground.  When measuring other MCU, the voltage of this pin is relatively high. The reason for paying attention to this voltage is because the crystal manufacturer said that the starting point of the passive crystal is 1.3V.  So I want to ask if this is normal.  Other than that, these frequencies are normal.

波形

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