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X9279TV14I Datasheet(PDF) 6 Page - Xicor Inc. |
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X9279TV14I Datasheet(HTML) 6 Page - Xicor Inc. |
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6 / 24 page  X9279 Characteristics subject to change without notice. 6 of 24 REV 1.1.7 2/6/03 www.xicor.com SERIAL INTERFACE DESCRIPTION Serial Interface The X9279 supports a bidirectional bus oriented protocol. The protocol defines any device that sends data onto the bus as a transmitter and the receiving device as the receiver. The device controlling the transfer is a master and the device being controlled is the slave. The master will always initiate data transfers and provide the clock for both transmit and receive operations. Therefore, the X9279 will be considered a slave device in all applications. Clock and Data Conventions Data states on the SDA line can change only during SCL LOW periods. SDA state changes during SCL HIGH are reserved for indicating start and stop conditions. See Figure 2. Start Condition All commands to the X9279 are preceded by the start condition, which is a HIGH to LOW transition of SDA while SCL is HIGH. The X9279 continuously monitors the SDA and SCL lines for the start condition and will not respond to any command until this condition is met. See Figure 2. Stop Condition All communications must be terminated by a stop condition, which is a LOW to HIGH transition of SDA while SCL is HIGH. See Figure 2. Acknowledge Acknowledge is a software convention used to provide a positive handshake between the master and slave devices on the bus to indicate the successful receipt of data. The transmitting device, either the master or the slave, will release the SDA bus after transmitting eight bits. The master generates a ninth clock cycle and during this period the receiver pulls the SDA line LOW to acknowledge that it successfully received the eight bits of data. The X9279 will respond with an acknowledge after recognition of a start condition and its slave address and once again after successful receipt of the command byte. If the command is followed by a data byte the X9279 will respond with a final acknowledge. See Figure 2. Figure 2. Acknowledge Response from Receiver SCL FROM MASTER DATA OUTPUT FROM TRANSMITTER 1 89 DATA OUTPUT FROM RECEIVER START ACKNOWLEDGE |
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