Datasheet

Function
10 SPI1 SCK UART1 CTS I2C1 SDA PWM5 A SIO PIO0 PIO1 USB VBUS DET
11 SPI1 TX UART1 RTS I2C1 SCL PWM5 B SIO PIO0 PIO1 USB VBUS EN
12 SPI1 RX UART0 TX I2C0 SDA PWM6 A SIO PIO0 PIO1 USB OVCUR DET
13 SPI1 CSn UART0 RX I2C0 SCL PWM6 B SIO PIO0 PIO1 USB VBUS DET
14 SPI1 SCK UART0 CTS I2C1 SDA PWM7 A SIO PIO0 PIO1 USB VBUS EN
15 SPI1 TX UART0 RTS I2C1 SCL PWM7 B SIO PIO0 PIO1 USB OVCUR DET
16 SPI0 RX UART0 TX I2C0 SDA PWM0 A SIO PIO0 PIO1 USB VBUS DET
17 SPI0 CSn UART0 RX I2C0 SCL PWM0 B SIO PIO0 PIO1 USB VBUS EN
18 SPI0 SCK UART0 CTS I2C1 SDA PWM1 A SIO PIO0 PIO1 USB OVCUR DET
19 SPI0 TX UART0 RTS I2C1 SCL PWM1 B SIO PIO0 PIO1 USB VBUS DET
20 SPI0 RX UART1 TX I2C0 SDA PWM2 A SIO PIO0 PIO1 CLOCK GPIN0 USB VBUS EN
21 SPI0 CSn UART1 RX I2C0 SCL PWM2 B SIO PIO0 PIO1 CLOCK GPOUT0 USB OVCUR DET
22 SPI0 SCK UART1 CTS I2C1 SDA PWM3 A SIO PIO0 PIO1 CLOCK GPIN1 USB VBUS DET
23 SPI0 TX UART1 RTS I2C1 SCL PWM3 B SIO PIO0 PIO1 CLOCK GPOUT1 USB VBUS EN
24 SPI1 RX UART1 TX I2C0 SDA PWM4 A SIO PIO0 PIO1 CLOCK GPOUT2 USB OVCUR DET
25 SPI1 CSn UART1 RX I2C0 SCL PWM4 B SIO PIO0 PIO1 CLOCK GPOUT3 USB VBUS DET
26 SPI1 SCK UART1 CTS I2C1 SDA PWM5 A SIO PIO0 PIO1 USB VBUS EN
27 SPI1 TX UART1 RTS I2C1 SCL PWM5 B SIO PIO0 PIO1 USB OVCUR DET
28 SPI1 RX UART0 TX I2C0 SDA PWM6 A SIO PIO0 PIO1 USB VBUS DET
29 SPI1 CSn UART0 RX I2C0 SCL PWM6 B SIO PIO0 PIO1 USB VBUS EN
Each GPIO can have one function selected at a time. Likewise, each peripheral input (e.g. UART0 RX) should only be
selected on one GPIO at a time. If the same peripheral input is connected to multiple GPIOs, the peripheral sees the
logical OR of these GPIO inputs.
Table 290. GPIO User
Bank 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 user bank 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.
RP2040 Datasheet
2.19. GPIO 259