请问TX_TRIG管脚悬空能不能使用?
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您好,TX_TRIG是用来同步内部PLL时钟分频的。上电后需要给一个脉冲信号,如8.3.4中的时序,所以不能直接悬空,这个引脚内部已经下拉,如果悬空则一直处于低电平状态。
