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STE12PS Datasheet(PDF) 28 Page - STMicroelectronics |
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STE12PS Datasheet(HTML) 28 Page - STMicroelectronics |
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28 / 44 page  Obsolete Product(s) - Obsolete Product(s) I2C slave protocol overview STE12PS 28/44 5.5 Register addressing: write command format I2C write command format is shown in Figure 14. Figure 14. Write command The formatting bits shown in Figure 14 are defined as follows: ● S - I2C start condition ● P - I2C stop condition ● ACK – acknowledge ● NACK - not acknowledge ● R/W - read/write The device address is the value specified in I2C device address. The register address is an eight-bit value that is written into an internal Index Register. Each time a byte of data is written to, or read from the POE controller, the Index Register increments by one. If the initial value written to the Index Register is K, then the byte immediately following the Register Address byte is written to the register with an address of K. The next byte is written to the register with the address of K+1, and so on. An I2C write command can contain from 0 to 255 write data bytes. Write commands to an unknown register location are ignored by the interface. As shown in Figure 14, bits are ordered with the most significant bit first. S 6 54 32 1 0 Device address W 7 . Register address (K) 6543210 7 6 54 32 1 0 Write data 7 . Write data (K + 1) 6543210 7 6 54 32 1 0 Write data (K + N) |
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