Datasheet

Table 2. GPIO bank 0
function descriptions
Function Name Description
SPIx Connect one of the internal PL022 SPI peripherals to GPIO
UARTx Connect one of the internal PL011 UART peripherals to GPIO
I2Cx Connect one of the internal DW I2C peripherals to GPIO
PWMx A/B Connect a PWM slice to GPIO. There are eight PWM slices, each with two output channels
(A/B). The B pin can also be used as an input, for frequency and duty cycle measurement.
SIO
Software control of GPIO, from the single-cycle IO (SIO) block. The SIO function (F5) must
be selected for the processors to drive a GPIO, but the input is always connected, so
software can check the state of GPIOs at any time.
PIOx Connect one of the programmable IO blocks (PIO) to GPIO. PIO can implement a wide
variety of interfaces, and has its own internal pin mapping hardware, allowing flexible
placement of digital interfaces on bank 0 GPIOs. The PIO function (F6, F7) must be
selected for PIO to drive a GPIO, but the input is always connected, so the PIOs can
always see the state of all pins.
CLOCK GPINx General purpose clock inputs. Can be routed to a number of internal clock domains on
RP2040, e.g. to provide a 1 Hz clock for the RTC, or can be connected to an internal
frequency counter.
CLOCK GPOUTx General purpose clock outputs. Can drive a number of internal clocks (including PLL
outputs) onto GPIOs, with optional integer divide.
USB OVCUR DET/VBUS
DET/VBUS EN
USB power control signals to/from the internal USB controller
RP2040 Datasheet
1.4. Pinout Reference 20