The datasheet is right. It specifically states that the lower four bits are unimplemented, which in the Legends for the various pages it states that unimplemented bits are read as '0'. And to that end, I remember reading a long time ago in one of those PIC XXxxxx Family Reference manuals that writes to unimplemented bits are discouraged, most like just because they are exactly that...unimplemented. (Remember the Z-80 back in the day, there were a bunch of bit codes that were 'unimplemented' and turned out to be extended instructions that didn't quite work out the way they'd planned)Originally Posted by jderson
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