8.5.1.1 I²C Read and Write Procedures

Following the successful acknowledgment of the I²C address byte, the bus master shall send one register address byte indicating the address of the register on which the read or write operation needs to be performed. This register address is stored in an internal register and used by the device for subsequent read/write to the device. After the device address is acknowledged by the slave, all register addresses will be acknowledged even if an actual register is not defined for that address

The TCA5013 supports an auto increment feature by which multiple bytes can be written to consecutive registers without requiring the master to send the device address and register address for each data byte. Auto increment is enabled by setting the MSB of the register address to a 1 (see Figure 23). If auto increment is used to write the entire register map, the gaps in the register address map need to be written with dummy bytes. If auto increment is used to read the entire register map then data read from gaps in the register map will be 8’hFF

Figure 23. I²C Write Procedure

Figure 24. I²C Read Procedure

Figure 25. I²C Read Procedure with Repeated Start