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CAT24C03WIT3 데이터시트(PDF) 6 Page - Catalyst Semiconductor |
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CAT24C03WIT3 데이터시트(HTML) 6 Page - Catalyst Semiconductor |
6 / 17 page CAT24C01/02/04/08/16 6 Doc. No. 1115, Rev. C © 2006 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice WRITE OPERATIONS Byte Write In Byte Write mode, the Master sends the START condi- tion 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 CAT24Cxx. After receiv- ing another acknowledge from the Slave, the Master transmits the data byte to be written into the addressed memory location. The CAT24Cxx device will acknowl- edge the data byte and the Master generates the STOP condition, at which time the device begins its internal Write cycle to nonvolatile memory (Figure 5). While this internal cycle is in progress (tWR), the SDA output will be tri-stated and the CAT24Cxx will not respond to any request from the Master device (Figure 6). Page Write The CAT24Cxx writes up to 16 bytes of data in a single write cycle, using the Page Write operation (Figure 7). The Page Write operation is initiated in the same manner as the Byte Write operation, however instead of termi- nating after the data byte is transmitted, the Master is allowed to send up to fifteen additional bytes. After each byte has been transmitted the CAT24Cxx 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 CAT24Cxx 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 CAT24Cxx initiates the internal write cycle. TheACK polling can be initiated immediately. This involves issuing the start condition followed by the slave address for a write operation. If the CAT24Cxx is still busy with the write operation, NoACK will be returned. If the CAT24Cxx has completed the internal write operation, an ACK will be returned and the host can then proceed with the next read or write operation. Hardware Write Protection WiththeWPpinheldHIGH,theentirememoryisprotected against Write operations. If the WP pin is left floating or is grounded, it has no impact on the operation of the CAT24Cxx. The state of the WP pin is strobed on the last falling edge of SCL immediately preceding the first data byte (Figure 8). If the WP pin is HIGH during the strobe interval, the CAT24Cxx will not acknowledge the data byte and the Write request will be rejected. Delivery State The CAT24Cxx is shipped erased, i.e., all bytes are FFh. |
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