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The overall communications between the master and the slave device requires data sequences and acknowledgments throughout the cycle. The red lines indicate when the master device controls the bus and the blue lines indicate when the slave device is driving the bus. Once the master issues the start bit it then drives the address on the bus and indicates the direction of the transfer (either a read or a write). At that point the addressed slave is required to generate an acknowledgment (drive the bus low) for a bit time. Once the handshake is complete the master either receives or transmits data from/to the slave. To complete the transfer another acknowledgment phase is generated by the receiving device and the master terminates with the stop bit.
PTM Published on: 2011-05-13
South Korea