@User: There will be standard digital I/O that is buffered and running through a peripheral circuit that allows the management SoC to switch between itself and the user area for use of the pad. You can connect directly to the pad for analog purposes, but that is unbuffered. I will have a list of recommendations on what pads to use for analog I/O because there are specific ones that you cannot use, at least not without being able to tri-state it when in reset.