The “Romi 32U4 functions” column documents what the pin is used for on the Romi 32U4 Control Board. Many pins can serve multiple purposes concurrently by switching modes. For example, PB0 can read the state of button C when it is an input, and it can control the red LED and serve as an LCD data line when it is an output. | The “Romi 32U4 functions” column documents what the pin is used for on the Romi 32U4 Control Board. Many pins can serve multiple purposes concurrently by switching modes. For example, PB0 can read the state of button C when it is an input, and it can control the red LED and serve as an LCD data line when it is an output. |