I want to contral ADAU1701 with a 8bit MCU, and I have seen the datasheet of ADAU1707. However I just get a few CONTROL REGISTER DETAILS in datasheet. For example, I've put volume controls module into SigmaStudio, and programs it into ADAU1701. Now how can I control the volume with MCU. I don't see any world about the register of volume contoling.