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ST25C01B5TR 데이터시트(PDF) 8 Page - STMicroelectronics |
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ST25C01B5TR 데이터시트(HTML) 8 Page - STMicroelectronics |
8 / 16 page SCL SDA SCL SDA SDA START CONDITION SDA INPUT SDA CHANGE AI00792 STOP CONDITION 1 23 7 89 MSB ACK START CONDITION SCL 1 23 7 89 MSB ACK STOP CONDITION Figure 6. I2C Bus Protocol Write Operations The Multibyte Write mode (only available on the ST24/25C01 and the ST24C01R versions) is se- lected when the MODE pin is at VIH and the Page Write mode when MODE pin is at VIL. The MODE pin may be driven dynamically with CMOS input levels. Following a START condition the master sends a device select code with the RW bit reset to ’0’. The memory acknowledges this and waits for a byte address. The byte address of 7 bits (the Most Significant Bit is ignored) provides access to any of the 128 bytes of the memory. After receipt of the byte address the device again responds with an acknowledge. For the ST24/25W01 versions, any write command with WC = 1 (during a period of time from the START condition untill the end of the Byte Address) will not modify data and will NOT be acknowledged on data bytes, as in Figure 9. Byte Write. In the Byte Write mode the master sends one data byte, which is acknowledged by the memory. The master then terminates the transfer by generating a STOP condition. The Write mode is independant of the state of the MODE pin which could be left floating if only this mode was to be used. However it is not a recommended operating mode, as this pin has to be connected to either VIH or VIL, to minimize the stand-by current. 8/16 ST24/25C01, ST24C01R, ST24/25W01 |
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