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标准的 IIC ，只有四种基本的模式。
master transmit — master node is sending data to a slave
master receive — master node is receiving data from a slave
slave transmit — slave node is sending data to the master
slave receive — slave node is receiving data from the master
我用过的单片机还比较少，不知道哪种还可以支持广播模式？
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master transmit — master node is sending data to a slave
master receive — master node is receiving data from a slave
slave transmit — slave node is sending data to the master
slave receive — slave node is receiving data from the master
我用过的单片机还比较少，不知道哪种还可以支持广播模式？
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