Raspberry Pi Pico schematic

Raspberry Pi Pico datasheet

RP2040 datasheet

Hardware design with RP2040

Software reference materials #

Getting started programming the Pico in Python, plus Python reference

Getting started programming the Pico in C

Pico C code reference

Web-based version of the C code reference, plus other useful documentation links

High resolution, zoomable image of RP2040 die, thanks to John McMaster

Twitter thread with more RP2040 images from John McMaster