On Thu, 11 Jul 2002 10:18:58 -0400, "A.J. Tufgar" wrote:

>Good day all,
>             Simple question about the TRIS reg.  When I change the TRIS
>reg direction for writing to and from an i2c bus I notice it changes
>some of the other PORTB values that I'm not working with.

Which is changing: the PORTB value or the TRISB value? You should
double check your bank selection to ensure that you're really writing
where you think you are.=20

> Is it
>possible to stop this?

Actually, it's not possible to do it (unless your bank selection is
wrong). :=3D)=20

>
>It changes pin 2 when modifying TRIS6.

Doing logic and math operations (see read-modify-write threads in
archives) on an internal register like TRISB shouldn't cause
unexpected bit changes. Doing those same operations on the PORTB
address can.


Regards, Bob

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