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“数据传输必须带响应相关的响应时钟脉冲由主机产生在响应的时钟脉冲期间发送器释放SDA 线。”
请问，比如说，主机向从机写地址和读/写位以后，主机如何释放SDA线？
I2C总线是开漏的，当主机发送完第8位之后，设置SDA为输入就相当于把SDA释放出来了。口线会因为上拉电阻拉高，从机可以自由拉低。
