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CAT140049SWI-GT3 датащи(PDF) 8 Page - Catalyst Semiconductor |
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CAT140049SWI-GT3 датащи(HTML) 8 Page - Catalyst Semiconductor |
8 / 14 page CAT140xx Doc. No. 1117 Rev. A 8 © 2006 Catalyst Semiconductor, Inc. Characteristics subject to change without notice WRITE OPERATIONS Byte Write In Byte Write mode, the Master sends the START condition and the Slave address with the R/W bit set to zero to the Slave. After the Slave generates an acknowledge, the Master sends the byte address that is to be written into the address pointer of the CAT140xx. After receiving another acknowledge from the Slave, the Master transmits the data byte to be written into the addressed memory location. The CAT140xx device will acknowledge the data byte and the Master generates the STOP condition, at which time the device begins its internal Write cycle to nonvolatile memory (Figure 7). While this internal cycle is in progress (tWR), the SDA output will be tri- stated and the CAT140xx will not respond to any request from the Master device (Figure 8). Page Write The CAT140xx writes up to 16 bytes of data in a single write cycle, using the Page Write operation (Figure 9). The Page Write operation is initiated in the same manner as the Byte Write operation, however instead of terminating after the data byte is transmitted, the Master is allowed to send up to fifteen additional bytes. After each byte has been transmitted the CAT140xx will respond with an acknowledge and internally increments the four low order address bits. The high order bits that define the page address remain unchanged. If the Master transmits more than sixteen bytes prior to sending the STOP condition, the address counter ‘wraps around’ to the beginning of page and previously transmitted data will be overwritten. Once all sixteen bytes are received and the STOP condition has been sent by the Master, the internal Write cycle begins. At this point all received data is written to the CAT140xx in a single write cycle. Acknowledge Polling The acknowledge (ACK) polling routine can be used to take advantage of the typical write cycle time. Once the stop condition is issued to indicate the end of the host’s write operation, the CAT140xx initiates the internal write cycle. The ACK polling can be initiated immediately. This involves issuing the start condition followed by the slave address for a write operation. If the CAT140xx is still busy with the write operation, NoACK will be returned. If the CAT140xx has completed the internal write operation, an ACK will be returned and the host can then proceed with the next read or write operation. |
Аналогичный номер детали - CAT140049SWI-GT3 |
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Аналогичное описание - CAT140049SWI-GT3 |
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