Peter L. Peres <PICLIST@MITVMA.MIT.EDU> wrote:

> If you have the code snippet:
>
>         bsf     GPIO,I2CBIT
>         movlw   TRIS_PRESET
>         andlw   TRIS_I2COUT
>         tris    GPIO
>
> then TRIS_PRESET would be something like B'10101' and TRIS_I2COUT
> would be B'11110' to turn GPIO,0 to output as I2C data line (SDA).

Peter:

I meant to say something about this when you originally posted it...
There seems little need to waste a cycle performing an "and" on two
constants; with TRIS_I2COUT defined as 10100 and TRIS_I2CIN defined
as 10101, you could replace your movlw/andlw/tris with:

    MOVLW   TRIS_I2COUT
    TRIS    GPIO

-Andy


=== Andrew Warren - fastfwd@ix.netcom.com
=== Fast Forward Engineering - San Diego, California
=== http://www.geocities.com/SiliconValley/2499