Thanks a Million Jims, I would never have figured that out on my own.
I did read the bit math tutorial, and it seemed to only skim the surface. Case in point, it didn't touch on input or other registers at all.
BTW, is there a more complete reference to the relationship between pins, functions, and register names... I figured out that they were all pd#, which I assume means "pin-digital", but how do I derive register names from the abbreviated pinmapping? Or, better yet it there a list of important registers, and their functions?
thanks,
greg