> (Just as a note, the page bits (PCLATH) are set when you do your
> call and restored on return.

PCLATH is **NOT** altered by a CALL or RETURN.

> Typically the page bits in PCLATH are manipulated when you modify the
> program counter PCL, as in the case of a computed goto.  Otherwise, you
> really don't have to worry about PCLATH much.)

No, no, no!  You have to worry about PCLATH whenever you do a CALL or GOTO
to a location that could be on a different page.  After a subroutine
returns, PCLATH is set the way the subroutine left it, which is usually
pointing to its page.  This can mess up GOTOs that otherwise go to addresses
known to be on the same page.


*****************************************************************
Olin Lathrop, embedded systems consultant in Devens Massachusetts
(978) 772-3129, olin@embedinc.com, http://www.embedinc.com

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