Correct description of feedback

[SpenceKonde]

feedback input takes the "output" of the even LUT (which is taken as the output of the sequencer if that is used, otherwise the output of the LUT itself. Unclear if intended and the documentation is poorly written.

Also - were you going to cut the tinyAVR and Dx-stuff from the readme for MegaCoreX? (do note that I've cut the mega/Dx-stuff from megaTinyCore readme, and am cutting tiny stuff from DxCore version.

[SpenceKonde]

Oh - an as a wacky aside - as you surely know, there are multiple ways to make a LUT oscillate (the simplest, truth=0x01, input0 feedback and the others masked (on an even LUT, of course!) runs at nearly 100 MHz on Dx parts, routing it through the event system gives ~53 on same chip, two LUTs bouncing off eachother is like 35, and so on). Anyway, if you set up one of those to output on the pin, then jump that to PA0, and set the clock to external, you can clock the chip off it's oscillating LUT :-P Why you would want to is another matter (in fact, I'm almost positive only a madman would) - but its good for a laugh, no? (obviously you do need to prescale it to get the clock speed in spec, depending on the part and how you've got the LUTs oscillating)

[MCUdude]

Thanks for the PR! And merry Christmas!

Unclear if intended and the documentation is poorly written.

It's just poorly written, sorry.

Also - were you going to cut the tinyAVR and Dx-stuff from the readme for MegaCoreX? (do note that I've cut the mega/Dx-stuff from megaTinyCore readme, and am cutting tiny stuff from DxCore version.

I've totally forgotten to remove the tinyAVR references in the readme. Would you like to do this in this PR too? 😇

Oh - an as a wacky aside - as you surely know, there are multiple ways to make a LUT oscillate (the simplest, truth=0x01, input0 feedback and the others masked (on an even LUT, of course!) runs at nearly 100 MHz on Dx parts, routing it through the event system gives ~53 on same chip, two LUTs bouncing off eachother is like 35, and so on). Anyway, if you set up one of those to output on the pin, then jump that to PA0, and set the clock to external, you can clock the chip off it's oscillating LUT :-P Why you would want to is another matter (in fact, I'm almost positive only a madman would) - but its good for a laugh, no?

Cool, I didn't know this. I'll for sure give it a try to see what frequencies I can achieve.