And to add to that:
Servo pulses normally get updated every 20 mS, so it's a pulse of 1-2 mS
every 20mS.
So you got 20mS to update each of your eight servos, one after the
other:
  _
_| |__________1
___| |________2
_____| |______3
etc.

Quentin

Dave VanHorn wrote:
>
> >  thanks for responding to this mail. i am trying to control 8 sevro with
> > pic. The position of the sevro will depend on the pause signal.nornmally
> the
> > range is between 10ms to 800ms. it is possible to update all the pins with
> > min error?
>
> Are you sure you have these timings right?
> Typical servo pulse widths are 1-2mS with 1.5 being the center value.
>
> That being said,  you could define eight locations in memory, and have a
> loop (or timer interrupt) that decrements them, and if they are non-zero,
> set the appropriate output bit, and if zero, reset the output bit.
>
> The granularity there is the timer or loop time, and the error is defined by
> the difference in length of the turn-on and turn-off routines.