I'm working on some simple level controls in both ADAU1701 and ADAU1446 systems. I am going to configure them as up/down push-button controls, but instead of push-buttons I want to send basic 1/0 control signals from an MCU to a couple of GPIO inputs on the DSP. On my EVAL-1701 board, I see that there is a jumper to set DVDD of the GPIO eval board to either 3.3V or 5V, however the manual cautions against using the 5V setting. So, after pouring over the DSP and eval board datasheets, I can find no mention of the GPIO inputs being able to deal with a 5V input. Any ideas?