About this component
The Pico's only processor. It boots from the external QSPI flash, and its mask ROM contains a USB bootloader that cannot be erased, so a Pico with corrupted firmware can almost always be recovered with BOOTSEL. Its core supply comes from an internal regulator fed by the board's 3.3 V rail. A Pico that does not show up as a drive with BOOTSEL held usually has a power, crystal or USB-path problem rather than a bad chip.
What it does on this board
Dual-core ARM Cortex-M0+ @133MHz designed by Raspberry Pi.
Pinout & readings
No pinout or reference readings yet — these show what each pin does and what a healthy part should measure. Check the datasheet meanwhile.