How long is the connection?  If it is less than a few feet it is
probably not line noise.  Why is the 2k2 resistor there?  Are both chips
running off of the same supply voltage and ground?  Is the transmitter
pulling the high and low, not just letting it go high impedance?
        One quick thing to try: put a small cap from the data line to ground.
This will reduce transients, but will delay the signals by R*C.

Sherpa Doug


> -----Original Message-----
> From: Raymond Choat [mailto:rc@KENAI.NET]
> Sent: Thursday, August 16, 2001 4:24 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [PIC]: Pull downs ===>>
>
>
> I have two pic chips hooked together between B.5 on a 16f876
> (sender) and
> B.5 on a 16f877 (receiver). I have a 2k2 resistor between the
> two at the
> 16f876 (sender) side. The 16f876 (sender) line is normally
> low and turns to
> high to signal it is done. The 16f877 is seeing faulse
> signals from the
> 16f876 that the 16f876 is not sending, I think just line
> noise? Can I just
> use a pulldown 10k resistor  on the 16f877 side?
>
>
> 16f877 ------------------------[ 2k2 ]----16f876
>                  |
>                10k
>                  |
>                GND
>
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