3.13 General Purpose IOs (GPIO)

General Purpose IOs are the utility input/output signals connected to the SAM9X75D2G MPU ports.

See Table 3-1 for details about each port’s functions.

The following figure shows the processor PIO connections.

Figure 3-11. Processor PIOs

Some of the ports are multiplexed to accommodate more devices on the board and to showcase all the functions the SAM9X75D2G MPU can address off a single PIO wire.

Most of the lines that share multiple functions are split through passive resistors. In some cases, the user can use only one of their functions at a time or can develop a composite driver enabling the use of multiple functions at the same time.

The following figure shows the processor PIO muxing.

Figure 3-12. GPIO Distribution