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CAT24WC164KA-1.8TE13 데이터시트(PDF) 6 Page - Catalyst Semiconductor |
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CAT24WC164KA-1.8TE13 데이터시트(HTML) 6 Page - Catalyst Semiconductor |
6 / 10 page CAT24WC164 6 Doc. No. 1026, Rev. I When the CAT24WC164 is in a READ mode it transmits 8 bits of data, releases the SDA line, and monitors the line for an acknowledge. Once it receives this acknowledge, the CAT24WC164 will continue to transmit data. If no acknowledge is sent by the Master, the device terminates data transmission and waits for a STOP condition. 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 remainder of the byte address that is to be written into the address pointer of the CAT24WC164. After receiving another acknowledge from the Slave, the Master device transmits the data byte to be written into the addressed memory location. The CAT24WC164 acknowledge once more and the Master generates the STOP condition, at which time the device begins its internal programming cycle 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 CAT24WC164 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 fifteen additional bytes. After each byte has been transmitted the CAT24WC164 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 sixteen bytes prior to sending the STOP condition, the address counter ‘wraps around’, 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 programming cycle begins. At this point all received data is written to the CAT24WC164 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 CAT24WC164 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 CAT24WC164 is still busy with the write operation, no ACK will be returned. If the CAT24WC164 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 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. The CAT24WC164 will accept both slave and byte addresses, but the memory location accessed is protected from programming by the device’s failure to send an acknowledge after the first byte of data is received. Figure 5. Slave Address Bits ** a8, a9 and a10 correspond to the address of the memory array address word. *** A0, A1 and A2 must compare to its corresponding hard wired input pins (pins 1, 2 and 3). 1 A2 A1 A0 a10 a9 a8 R/W CAT24WC164 |
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