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X24026X Datasheet(PDF) 4 Page - Xicor Inc. |
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X24026X Datasheet(HTML) 4 Page - Xicor Inc. |
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4 / 15 page  X24026 4 Stop Condition All communications must be terminated by a stop condi- tion, which is a LOW to HIGH transition of SDA when SCL is HIGH. The stop condition is also used by the X24026 to place the device in the standby power mode after a read sequence. A stop condition can only be issued after the transmitting device has released the bus. Acknowledge Acknowledge is a software convention used to indicate successful data transfer. The transmitting device, either master or slave, will release the bus after transmitting eight bits. During the ninth clock cycle the receiver will pull the SDA line LOW to acknowledge that it received the eight bits of data. Refer to Figure 3. The X24026 will respond with an acknowledge after rec- ognition of a start condition and its slave address. If both the device and a write operation have been selected, the X24026 will respond with an acknowledge after the receipt of each subsequent eight bit word. In the read mode the X24026 will transmit eight bits of data, release the SDA line and monitor the line for an acknowledge. If an acknowledge is detected and no stop condition is generated by the master, the X24026 will continue to transmit data. If an acknowledge is not detected, the X24026 will terminate further data trans- missions. The master must then issue a stop condition to return the X24026 to the standby power mode and place the device into a known state. Figure 2. Definition of Start and Stop Figure 3. Acknowledge Response from Receiver SCL SDA START BIT STOP BIT 7020 FRM 04 7020 FRM 05 SCL FROM MASTER DATA OUTPUT FROM TRANSMITTER 1 8 9 DATA OUTPUT FROM RECEIVER START ACKNOWLEDGE |
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