I’m wondering what to do with unused digital pins. For example, if using 1 of the 4 SD card interfaces, is it okay to leave all those unused pins floating? The note found in the reference manual was “All digital I/O supplies (NVCC_xxxx) must be powered under normal conditions whether the associated I/O pins are in use or not and associated IO pins need to have a Pullup or Pulldown resistor applied to limit any floating gate current.”
Which would imply to add external pulldown resistors to all unused digital pins, but it's not clear if there are internal resistors. I don’t see anything in the hardware guide about this. What value should be used?
Thanks in advance,