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I2C bus: protocol
The first byte on SDA after the start is the control byte.
The leftmost seven bits of a control byte indicate the destination address (devices).
The rightmost bits of the control byte indicate whether the data transfer is a write (send) or a read (receive).
etc. . .
An informative web page “The I2C Faq” is located at http://www.ping.be/~ping0751/i2cfaq/i2cindex.htm