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X1240 Datasheet(PDF) 6 Page - Xicor Inc. |
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X1240 Datasheet(HTML) 6 Page - Xicor Inc. |
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6 / 19 page  X1240 6 SERIAL COMMUNICATION Interface Conventions The device supports a bidirectional bus oriented proto- col. 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 called the master and the device being controlled is called the slave. The master always initiates data transfers, and provides the clock for both transmit and receive operations. Therefore, the devices in this fam- ily operate as slaves in all applications. Clock and Data Data states on the SDA line can change only during SCL LOW. SDA state changes during SCL HIGH are reserved for indicating start and stop conditions. See Figure 3. Start Condition All commands are preceded by the start condition, which is a HIGH to LOW transition of SDA when SCL is HIGH. The device continuously monitors the SDA and SCL lines for the start condition and will not respond to any command until this condition has been met. See Figure 3. Stop Condition All communications must be terminated by a stop con- dition, which is a LOW to HIGH transition of SDA when SCL is HIGH. The stop condition is also used to place the device into the Standby power mode after a read sequence. A stop condition can only be issued after the transmitting device has released the bus Refer to Figure 3. Figure 3. Valid Data Changes on the SDA Bus SCL SDA Data Stable Data Change Data Stable Figure 4. Valid Start and Stop Conditions SCL SDA Start Stop |
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