PocketBeagle 2 PR0 meaning

in the pin mux documentation of the PocketBeagle 2
what is the PR0 (zero), or should i say, what is the PR0

not sure exactly what PR0 translates to… but it always is added to the PRU0 and PRU1 pins.

So if you see a PR0_PRU0 or a PR0_PRU1 then it means that the pin is mapped to Programmable Real-Time Unit 0 or 1, respectively. It’s essentially an on chip microcontroller.

https://markayoder.github.io/PRUCookbook/01case/case.html

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I did notice that when looking at the datasheet and TRM. just never found any definition to it.