#Is msb sent first for serial communication protocol series# This is done to wake the idling SLAVE devices on the bus. This is one of the two times the SDA line is allowed to change state when SCL is high. & lt img src='' alt='Figure 2: Start Condition And Stop Condition Transitions'& gt įigure 2: Start Condition And Stop Condition Transitions To signify a start condition, the SDA line transitions from HIGH state to LOW state, while SCL is HIGH. Similar to a start condition, the stop condition occurs at the end of a data transfer, and is also generated by the MASTER. This signifies the end of the transfer and is a command to tell the slave devices that they should go back to an idle state, release the SDA line and not send any more data on the bus. This is the second instance where the SDA line is allowed to change state when SCL is HIGH. The SDA line transitions from LOW to HIGH state, while SCL is HIGH, to signify a stop condition. In all other conditions the SDA line only changes state when the SCL line is LOW.Ī start condition can be repeated during a transmission without the need for first terminating with a Stop condition. #Is msb sent first for serial communication protocol series#.
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