Mechanical Buttons

SAM C21 Xplained Pro contains two mechanical buttons connected to the SAM C21. One button is the RESET button connected to the reset line and the other is a generic user configurable button. When a button is pressed it will drive the I/O line to GND.

Info: There is no pull-up resistor connected to the generic user button. Remember to enable the internal pull-up in the SAM C21 to use the button.
Table 1. Mechanical Buttons
SAM C21 pin Function Shared functionality
RESETN RESET Shield, Shield(2), and EDBG
PA28 SW0 EXT3 and EDBG GPIO3