Do you have the potentiometer connected as a variable voltage divider from the microcontroller power supply?
Do you realise that the microcontroller drives the display, the display doesn't "read" the microcontroller.
Have you ever programmed this type of microcontroller (or any microcontroller)?
Have you set up the software development environment for the microcontroller?
Do you have the display and the microcontroller?
Have you investigated the software drivers for the display?