If the host pulls clock low before the first high-to-low clock transition, or after the falling edge of the a last clock pulse, the keyboard/mouse does not need to retransmit any data.

 
  • 如果在第一个高->低时钟跳变时,(或者在最后一个时钟脉冲的下降沿之后)主机将时钟拉低,键盘/鼠标不必重新传输任何数据。
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