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按照DATASHEET，应该是XIN1 接参考时钟，XIN2接GND。
您好，
不好意思，我笔误，按电路图上的连接，是XIN2接地，XIN1，接输入
如果是crystal输入，那么XIN1和XIN2分别接到crystal的两端，如果是单端输入，那么可以像你说的XIN2接GND。
