> What would be the best way to
> generate a random number using a
> pic? The problem is I need to have
> the pic send a repetitive voice
> message at random intervals
> between, say, 0.5 sec to maybe 5
> sec. to make it sound more
> 'natural'.


a PN code generator takes only three bytes of ram, and a few instructions.
You call the routine, and it shifts the bits. The bit patterns are
predictable, but the interval between repeats of a pattern can be a long
long time, so you'll never notice it isn't random.