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STW81103ATR Datasheet(PDF) 29 Page - STMicroelectronics |
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STW81103ATR Datasheet(HTML) 29 Page - STMicroelectronics |
29 / 53 page STW81103 I2C bus interface 29/53 6.1.5 Single-byte write mode Following a START condition, the master sends a device select code with the RW bit set to 0. The STW81103 sends an acknowledge and waits for the 1-byte internal sub-address that provides access to the internal registers. After receiving the sub-address internal byte, the STW81103 again responds with an acknowledge. A single-byte write to sub-address 00H changes the FUNCTIONAL_MODE register, a single-byte write with sub-address 04H changes the CONTROL register, and so on. 6.1.6 Multi-byte write mode The multi-byte write mode can start from any internal address. The master sends the data bytes, and each one is acknowledged. The master terminates the transfer by generating a STOP condition. The sub-address decides the starting byte. For example, a multi-byte with sub-address 01H and 2 DATA_IN bytes changes the B_COUNTER and A_COUNTER registers (01H,02H), and a multi-byte with sub-address 00H and 6 DATA_IN bytes changes all the STW81103 registers. 6.1.7 Current byte address read mode In the current byte address read mode, following a START condition, the master sends the device address with the RW bit set to 1. Note that no sub-address is needed since there is only one read register. The STW81103 acknowledges this and outputs the data byte. The master does not acknowledge the received byte, and terminates the transfer with a STOP condition. Table 11. Single-byte write mode S 1100A2A1A0 0 ack sub-address byte ack DATA IN ack P Table 12. Multi-byte write mode S 1100A2A1A0 0 ack sub-address byte ack DATA IN ack ……. DATA IN ack P Table 13. Current byte address read mode S 1100A2A1A0 1 ack DATA OUT No ack P |
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