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ST25C08 데이터시트(PDF) 11 Page - STMicroelectronics |
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ST25C08 데이터시트(HTML) 11 Page - STMicroelectronics |
11 / 16 page BYTE WRITE DEV SEL BYTE ADDR DATA IN WC PAGE WRITE DEV SEL BYTE ADDR DATA IN 1 WC DATA IN 2 AI01161B PAGE WRITE (cont'd) WC (cont'd) DATA IN N ACK ACK NO ACK R/W ACK ACK NO ACK R/W NO ACK NO ACK Figure 10. Write Modes Sequence with Write Control = 1 (ST24/25W08) Read Operations Read operations are independent of the state of the MODE pin. On delivery, the memory content is set at all "1’s" (or FFh). Current Address Read. The memory has an inter- nal byte address counter. Each time a byte is read, this counter is incremented. For the Current Ad- dress Read mode, following a START condition, the master sends a memory address with the RW bit set to ’1’. The memory acknowledges this and outputs the byte addressed by the internal byte address counter. This counter is then incremented. The master does NOT acknowledge the byte out- put, but terminates the transfer with a STOP con- dition. Random Address Read. A dummy write is per- formed to load the address into the address counter (see Figure 11). This is followed by another START condition from the master and the byte address is repeated with the RW bit set to ’1’. The memory acknowledges this and outputs the byte ad- dressed. The master have to NOT acknowledge the byte output, but terminates the transfer with a STOP condition. Sequential Read. This mode can be initiated with either a Current Address Read or a Random Ad- dress Read. However, in this case the master DOES acknowledge the data byte output and the memory continues to output the next byte in se- quence. To terminate the stream of bytes, the 11/16 ST24/25C08, ST24/25W08 |
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