The device power domains have their own GPIO ports with different capabilities.
The following is a list of all GPIO ports (P[n]) in the system.
- P0 low-power domain – These I/O pins can wake the system up from System OFF or System ON sleep, and can be accessed by all peripherals in the low-power domain.
- P1 and P3 peripheral domain – These I/O pins can wake the system up from System OFF or System ON sleep, and can be accessed by all peripherals in the peripheral domain.
- P2 MCU domain – These I/O pins are faster and can be used for high-speed signals such as trace or fast serial peripheral communication. GPIO P2 cannot wake the system from sleep. P2 does not have the GPIO SENSE or DETECT mechanism, or GPIOTE.
Peripherals cannot mix pins from different ports. All pins must be on the same port.
The following table lists the port special functions and characteristics.
| Port | Wakeup source | Extra high drive strength (E0E1) | Pin sense/detect | GPIOTE | Maximum speed [MHz] |
|---|---|---|---|---|---|
| P0 | Yes | No | Yes | Yes | 8 |
| P1 | Yes | No | Yes | Yes | 8 |
| P2 | No | Yes | No | No | 64 |
| P3 | Yes | No | Yes | Yes | 8 |
Please note that certain peripherals can operate the GPIOs at higher frequencies than those specified in the table above. In addition to the capabilities of the port, some specific pins have additional functions. These are listed in Pin assignments.