Preface: I'm not a layer.

I read the copyright information sections in several of the datasheets.  The datasheets do not impose any additional terms like the license that applies to the MPLAB code bundle (which I also read).  I also asked PJ from Groklaw about facts in a datasheet (this doesn't constitute legal advice, but is a second opinion):

"Facts are not copyrightable, but a collection of facts in a certain order, etc. could be, not the facts themselves but their arrangement in the whole."

So my interpretation is that by extracting the facts, breaking the presentation into a different arrangement (xml file, arbitrary ordering, etc.) constitutes a new work that can be copyrighted separately (the facts in my documents are still not copyright-able, so someone else could do exactly the same thing with my work).