3.5.3 Push Button Switches

The SAM9X75-Curiosity board features four push buttons:

  • One general purpose button (SW1) connected to GPIO PC09. This is free for user application usage.
  • One wake-up button (SW2) connected to WKUP0. When pressed, the processor exits from Shutdown state.
  • One board reset button (SW3). When pressed, the processor is reset.
  • One Start push button (SW4) connected to the MCP16502 pin. When pressed, the PMIC start-up sequence is initiated if the buck converters are off.

The following figure shows the push buttons implementation.

Equation 3-1. Push Buttons

The following table shows the user push button signal description.

Table 3-23. User Push Button Signal Description
PIO Signal Name Signal Description
PC09USER_BUTTONGeneral purpose input