I2C Address and R/W bit

I was reviewing my code and could not remember why the register addresses I defined in the code was different from the register addresses defined in the data sheet of the WM8741. After an hour reviewing the data sheet and the I2C protocol, I finaly realized that I2C address are 7 bit and the 8th bit is the Read/Write bit.

Since all the registers of the WM8741 are all write registers (R/W bit=0), they all end with zero. So the address value that you send in the I2C protocol is the 7 bit address plus the R/W bit, so the 8-bit values ends with zero.

Example:

7-bit Address plus R/W bit

00h=0000000 plus R/W bit = 00000000 = 00h or 0x00
01h=0000001 plus R/W bit = 00000010 = 02h or 0x02
02h=0000010 plus R/W bit = 00000100 = 04h or 0x04