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M24256-WMN6T Datasheet(PDF) 6 Page - STMicroelectronics |
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M24256-WMN6T Datasheet(HTML) 6 Page - STMicroelectronics |
6 / 17 page M24256, M24128 6/17 Figure 6. Write Mode Sequences with WC=0 (data write enabled) BYTE WRITE DEV SEL BYTE ADDR BYTE ADDR DATA IN WC PAGE WRITE DEV SEL BYTE ADDR BYTE ADDR DATA IN 1 WC DATA IN 2 AI01106B PAGE WRITE (cont'd) WC (cont'd) DATA IN N ACK R/W ACK ACK ACK ACK ACK ACK ACK R/W ACK ACK Write Operations Following a START condition the master sends a Device Select Code with the RW bit set to ’0’, as shown in Table 4. The memory acknowledges this, and waits for two address bytes. The memory re- sponds to each address byte with an acknowledge bit, and then waits for the data byte. Writing to the memory may be inhibited if the WC input pin is taken high. Any write command with WC=1 (during a period of time from the START condition until the end of the two address bytes) will not modify the memory contents, and the ac- companying data bytes will not be acknowledged, as shown in Figure 5. Byte Write In the Byte Write mode, after the Device Select Code and the address bytes, the master sends one data byte. If the addressed location is write protected by the WC pin, the memory replies with a NoAck, and the location is not modified. If, in- stead, the WC pin has been held at 0, as shown in Figure 6, the memory replies with an Ack. The master terminates the transfer by generating a STOP condition. Page Write The Page Write mode allows up to 64 bytes to be written in a single write cycle, provided that they are all located in the same ’row’ in the memory: that is the most significant memory address bits (b14-b6 for the M24256 and b13-b6 for the M24128) are the same. If more bytes are sent than Table 5. Most Significant Byte Note: 1. b15 is treated as Don’t Care on the M24256 series. b15 and b14 are Don’t Care on the M24128 series. Table 6. Least Significant Byte b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0 |
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