Special Pins

Boot Jumper / Flash CS Pin

Pull up resistor to +3.3V is not normally needed. RP2040 has built in pull up, but included as DNF as it is possible that different flash memory IC’s may have an issue with it floating at powerup before the RP2040 pull up is engaged. If needed then fit 10K.

Pull down to GND with 1K resistor for USB boot. If RP2040 reads pin as low at startup it will present itself as a USB mass storage device.

RUN Pin

Pull this pin low to reset the RP2040