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X24C01SI Datasheet(PDF) 4 Page - Xicor Inc. |
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X24C01SI Datasheet(HTML) 4 Page - Xicor Inc. |
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4 / 14 page  4 X24C01 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 by the X24C01 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 transfers. The transmitting device 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 X24C01 will respond with an acknowledge after recognition of a start condition, a seven bit word address and a R/W bit. If a write operation has been selected, the X24C01 will respond with an acknowledge after each byte of data is received. In the read mode the X24C01 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 X24C01 will continue to transmit data. If an acknowledge is not detected, the X24C01 will terminate further data trans- missions. The master must then issue a stop condition to return the X24C01 to the standby power mode and place the device into a known state. Figure 2. Definition of Start and Stop 3837 FHD F07 Figure 3. Acknowledge Response From Receiver SCL FROM MASTER DATA OUTPUT FROM TRANSMITTER 1 89 DATA OUTPUT FROM RECEIVER START ACKNOWLEDGE 3837 FHD F08 SCL SDA START CONDITION STOP CONDITION |
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