works only on port a,b, c  not d, e
regards henrik
----- Original Message ----- 
From: "Mike Mansheim" <Michael_J_Mansheim@GRACO.COM>
To: <PICLIST@mitvma.mit.edu>
Sent: Wednesday, March 22, 2000 11:54 PM
Subject: Re: TRIS or NOT ?


> Kev wrote:
> I'm muddling thru the 16F84 and I understand MicroChip does not intend to
> support the TRIS instruction in future products (is it usable in the
> 16F877?).
> 
> So in place of a TRIS command I would simply use a MOVWF   TRIS(A,B,etc)
> assuming that W is loaded with the desired mask.
> 
> You also need to switch to bank 1 before doing the movwf command, where the
> tris addresses then match the port addresses.  That's why people still like
> to use the tris command - no bank switch is required.
> If the tris command exists for a chip, it will always exist for that chip -
> Microchip cautions against using it in the case of using the same software
> on a future product that will not have the tris command.  I noticed in
> my16F87x data sheet that they emphatically say DONOT USE the tris
> instruction.  However, it's there and will always work with the F877 - it
> just may not work with a later pin compatible replacement for the F877 that
> you may want to drop your software directly into (kind of like moving from
> a C73 to an F873!)
>