Описано у них всё, просто надо в тексте внимательно смотреть, там прям так и написано бит записи в 0 и бит чтения в 1, только на картинках не понятно.
Цитата
As shown in Figure 16, a single-byte data-read transfer begins with the master device transmitting a start
condition followed by the I2C device address and the read/write bit. For the data-read transfer, both a write
followed by a read are actually done. Initially, a write is done to transfer the address byte or bytes of the internal
memory address to be read. As a result, the read/write bit is a 0. After receiving the address and the read/write
bit, the TAS5414B-Q1 or TAS5424B-Q1 responds with an acknowledge bit. In addition, after sending the internal
memory address byte or bytes, the master device transmits another start condition followed by the
TAS5414B-Q1 or TAS5424B-Q1 address and the read/write bit again. This time the read/write bit is a 1,
indicating a read transfer.