3.2.4 SAM R21 USB Availability
The USB pins are made available as differential pair routed GPIO’s. A base board with the required connection hardware can support an USB interface.
| Module Pin | Function | MCU Pin | Port Configuration or Xplain Function |
|---|---|---|---|
| 19 | GPIO or USB_D- | 33 | PA24: For USB MUX=G |
| 20 | SPIO or USB_D+ | 34 | PA25: For USB MUX=G |
The module power supply cannot be operated directly from a 5V USB source. The module base board must implement the required voltage regulator.