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CAT34AC02UI-TE13 Datasheet(PDF) 6 Page - Catalyst Semiconductor |
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CAT34AC02UI-TE13 Datasheet(HTML) 6 Page - Catalyst Semiconductor |
6 / 10 page CAT34AC02 6 Doc. No. 1025, Rev. E WRITE OPERATIONS Byte Write In the Byte Write mode, the Master device sends the START condition and the slave address information (with the R/ W bit set to zero) to the Slave device. After the Slave generates an acknowledge, the Master sends the byte address that is to be written into the address pointer of the CAT34AC02. After receiving another acknowledge from the Slave, the Master device transmits the data byte to be written into the addressed memory location. The CAT34AC02 acknowledges once more and the Master generates the STOP condition, at which time the device begins its internal programming to nonvolatile memory. While this internal cycle is in progress, the device will not respond to any request from the Master device. Page Write The CAT34AC02 writes up to 16 bytes of data in a single write cycle, using the Page Write operation. The Page Write operation is initiated in the same manner as the Byte Write operation, however instead of terminating after the initial word is transmitted, the Master is allowed to send up to 15 additional bytes. After each byte has been transmitted the CAT34AC02 will respond with an acknowledge, and internally increment the low order address bits by one. The high order bits remain unchanged. If the Master transmits more than 16 bytes prior to sending the STOP condition, the address counter ‘wraps around’, and previously transmitted data will be overwritten. Once all 16 bytes are received and the STOP condition has been sent by the Master, the internal programming cycle begins. At this point all received data is written to the CAT34AC02 in a single write cycle. Acknowledge Polling The disabling of the inputs 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 CAT34AC02 initiates the internal write cycle. ACK polling can be initiated immediately. This involves issuing the start condition followed by the slave address for a write operation. If the CAT34AC02 is still busy with the write operation, no ACK will be returned. If the CAT34AC02 has completed the write operation, an ACK will be returned and the host can then proceed with the next read or write operation. WRITE PROTECTION The write protection feature of CAT34AC02 allows the user to protect against inadvertent programming of the memory array. If the WP pin is tied to Vcc, the entire memory array is protected and becomes read only. If the WP pin is left floating or tied to Vss, the device can be written into. Figure 7. Page Write Timing Figure 6. Byte Write Timing BYTE ADDRESS SLAVE ADDRESS S A C K A C K DATA A C K S T O P P BUS ACTIVITY: MASTER SDA LINE S T A R T BUS ACTIVITY: MASTER SDA LINE DATA n+P BYTE ADDRESS (n) A C K A C K DATA n A C K S T O P S A C K DATA n+1 A C K S T A R T P SLAVE ADDRESS NOTE: IN THIS EXAMPLE n = XXXX 0000(B); X = 1 or 0 * |
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