JAJSH89D May 2012 – April 2019 CDCUN1208LP
PRODUCTION DATA.
Figure 37 shows a typical format for I2C messages. The message frame is bracketed by the START and STOP symbols (both generated by the master). If a START symbol has not been transmitted, then the bus is considered ‘available’. If a START symbol has been transmitted and a STOP symbol has not been transmitted, the bus is considered ‘busy’. The first 8 bits transmitted include the R/W bit and a 7-bit I2C address field. The reception of each byte grouping that is transmitted must be acknowledged by the receiver. Next, the high byte of the data pay load is transmitted (MSB first) followed by an acknowledgment by the receiver. Finally, the low byte is sent. After acknowledgment, the master sends a STOP symbol to end the message frame.