Do the Teensy 3.6 pins A10, A11, A21, A22 have internal pullups?

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No. look at pin info card: https://www.pjrc.com/teensy/pinout.html If there are gray pin numbers associated with pin, then it can can do "digital things" like pullups/pulldowns. A10, A11 A21, A22 are analog only. you can also also study the T3.6 ref manual, https://www.pjrc.com/teensy/datasheets.html

Actually I did reference the datasheet. They don't come right out and say, 'BTW, there are not pull-ups on those ports'.

I kinda knew the answer as my prototype was not.playing nicely. It's not the end of the world, but it's good to have it properly documented now.

Cheers
 
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