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ST24E64EM3TR 데이터시트(PDF) 10 Page - STMicroelectronics |
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ST24E64EM3TR 데이터시트(HTML) 10 Page - STMicroelectronics |
10 / 16 page 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 AI01106 PAGE WRITE (cont’d) WC (cont’d) DATA IN N ACK R/W ACK ACK ACK ACK ACK ACK ACK R/W ACK ACK Figure 8. Write Modes Sequence with Write Control = 0 Read Operations On delivery, the memory content is set at all ”1’s” (or FFh). Current Address Read. The ST24/25E64 have an internal 13 bits address counter. Each time a byte is read, this counter is incremented. For the Current Address Read mode, following a START condition, the master sends a Device Select with the RW bit set to ’1’. The ST24/25E64acknowledge this and outputs the byte addressed by the internal 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 10. This is followed by another START condition from the master and the byte address repeated with the RW bit set to ’1’. The ST24/25E64 acknowledge this and outputs the byte addressed. The master does NOT acknow- ledge 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 ST24/25E64 continue to output the next byte in 10/16 ST24E64, ST25E64 |
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