仅连接一个频率计数器到这个管脚，显示总线频率。
Just connect a frequency counter to this pin, and it will display your bus frequency.
简单的特征频率计数器，但为什么不计数发生在实时？
Simple character frequency counter, but why won't the count happen in realtime?
简单的特征频率计数器，但为什么不计数发生在实时？
Simple character frequency counter, but why won't the count happen in realtime?
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