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X24640 Datasheet(PDF) 4 Page - Xicor Inc. |
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X24640 Datasheet(HTML) 4 Page - Xicor Inc. |
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4 / 17 page  X24640 4 Figure 3. Acknowledge Response From Receiver Stop Condition All communications must be terminated by a stop condition, 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. Acknowledge Acknowledge is a software convention used to indicate successful data transfer. The transmitting device, either master or slave, will release the bus after trans- mitting 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 device will respond with an acknowledge after recognition of a start condition and its slave address. If both the device and a write operation have been selected, the device will respond with an acknowledge after the receipt of each subsequent 8-bit word. In the read mode the device 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 device will continue to transmit data. If an acknowledge is not detected, the device will terminate further data trans- missions. The master must then issue a stop condition to return the device to the standby power mode and place the device into a known state. SCL FROM MASTER DATA OUTPUT FROM TRANSMITTER 1 8 9 DATA OUTPUT FROM RECEIVER START ACKNOWLEDGE 7038 FM 05 |
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