TM4C123GXL GPIO – Enable GPIO pins as digital I/Os

GPIO – Enable GPIO pins as digital I/Os

To enable GPIO pins as digital I/Os, set the appropriate DEN bit in the GPIODEN register.

• Each pin of the TI ARM chip can have multiple functions. We choose the function by programming a special function register (GPIODEN).
• Using a single pin for multiple functions is called pin multiplexing and is widely used by microcontrollers.
• A given pin can be used as digital I/O, Analog input, or I2C pin. Of course not all at the same time.
• The GPIODEN register allows us to enable the pin to be used as digital I/O pin instead of analog function.
• Each PORT of A – F has its own GPIODEN register and one can enable the digital I/O for each pin of a given port.

 

 

 

 

 

 

 

Bit/Field	Name	Description
7:0	DEN	Digital Enable 0: The digital functions for the corresponding pin are disabled. 1: The digital functions for the corresponding pin are enabled.
31:8	Reserved	Software should not rely on the value of a reserved bit.