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ST25EM3TR Folha de dados(PDF) 8 Page - STMicroelectronics |
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ST25EM3TR Folha de dados(HTML) 8 Page - STMicroelectronics |
8 / 16 page Write Operations Following a START condition the master sends a device select code with the RW bit reset to ’0’. The ST24/25E16 acknowledge this and waits for 2 bytes of address. These 2 address bytes (8 bits each) provide access to any of the 8 blocks of 256 bytes each. Writing in the ST24/25E16 may be inhibited if input pin WC is taken high. For the ST24/25E16 versions, any write command with WC = ’1’ (during a period of time from the START condition untill the end of the 2 Bytes Address) will not modify data and will NOT be acknowledged on data bytes, as in Figure 9. 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 Byte Write. In the Byte Write mode the master sends one data byte, which is acknowledged by the ST24/25E16. The master then terminates the transfer by generating a STOP condition. Page Write. The Page Write mode allows up to 16 bytes to be written in a single write cycle, provided that they are all located in the same row of 16 bytes in the memory, that is the same Address bits (b10- b4). The master sends one up to 16 bytes of data, which are each acknowledged by the ST24/25E16. After each byte is transfered, the internal byte address counter (4 Least Significant Bits only) is incremented. The transfer is terminated by the master generating a STOP condition. Care must be taken to avoid address counter ’roll-over’ which 8/16 ST24E16, ST25E16 |
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