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X9119TV14IZ-2.7 Datasheet(PDF) 5 Page - Intersil Corporation |
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X9119TV14IZ-2.7 Datasheet(HTML) 5 Page - Intersil Corporation |
5 / 17 page 5 FN8162.4 July 9, 2008 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 3). 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 X9119 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 X9119 will respond with a final acknowledge (see Figure 2). ACKNOWLEDGE POLLING The disabling of the inputs, during the internal nonvolatile write operation, can be used to take advantage of the typical 5ms EEPROM write cycle time. Once the stop condition is issued to indicate the end of the nonvolatile write command the X9119 initiates the internal write cycle. ACK polling, Flow 1, can be initiated immediately. This involves issuing the start condition followed by the device slave address. If the X9119 is still busy with the write operation, no ACK will be returned. If the X9119 has completed the write operation, an ACK will be returned and the master can then proceed with the next operation. FLOW 1. ACK Polling Sequence SCL FROM MASTER DATA OUTPUT FROM TRANSMITTER 1 89 ST AR T ACKNOWLEDGE DATA OUTPUT FROM RECEIVER FIGURE 2. ACKNOWLEDGE RESPONSE FROM RECEIVER NONVOLATILE WRITE COMMAND COMPLETED ENTERACK POLLING ISSUE START ISSUE SLAVE ADDRESS ACK RETURNED? FURTHER OPERATION? ISSUE INSTRUCTION ISSUE STOP NO YES YES PROCEED ISSUE STOP NO PROCEED X9119 |
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