= Raspberry Pi Pico =

Raspberry pi's micrcontroler, based on the RP2040

See datasheet https://datasheets.raspberrypi.org/pico/pico-datasheet.pdf

== Pins ==

* VBUS is the 5V from the USB
* VSYS is the input voltage, from 2V to 5V. There is an on board voltage
  regulator to bring it down to 3.3V
* 3V3 is 3.3 volt output with a max draw of 300ma
* 3V3_EN is an input that allows you to shut off the internal voltage regulator
* RUN is the reset line
* Pins GP28 - GP 26 have ADC's attached, with a 12 bit resolution


== Interrupts ==

Hardware interrupts uses standard ARM nested vectored interrupt controller.
Interrupts have ID 0-31. The RP2040 only uses 0-26, the rest are tied to
ground. Both cores are tied to the same interrupt lines.

*Do not enable the same interrupt on both cores*, as this leads to race
conditions.


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