Hello,

> You total data rate requirement is only 40 bytes/second, which is very
low.
> I consider IIC the best architecture for this kind of situation for clock
> rates up to 400Kbits/second.  You could do IIC at 100KHz clock.  This
keeps
> everything at very comfortable limits and still allows for significant
> future expansion.  The reason for chosing IIC is that the low level
protocol
> includes addressing and it's handled directly by the PIC hardware.  Don't
> forget the extra cap on the SDA line.

Extra cap on the SDA line?  Is this cap something specific to the PIC16F877
(it isn't meantioned in the Philips I2C-bus specification).  What value of
cap should I be using and why?  Thanks.

Donovan

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