Thanks for replying but what I really mean is to use PIC to calculate when
the pin should turn high or low. the  program will run to produce a
continuous pulse for the servo in what way I can update and calculate the
status of the pin as fast as possible
----- Original Message -----
From: Martin Hill <eaxmjhi@NOTTINGHAM.AC.UK>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Wednesday, May 17, 2000 7:53 PM
Subject: Re: servo timing updating


> I'm not entirely clear on what it is you want to do, but if you want to
> update 16 outputs at the same time, then why not use latches to
> hold the data externally, setup the data to go into the latches either
> one per latch or by clocking the data in serially, then enable all of
> them with a single pin, this way they all update at the same time just
> using one instruction, so long as you know what the next state is
> going to be so you can set the pins accordingly.
>
> Martin.
>
> > hi everyone
> >
> > what is the fastest way to update 16 pins at one time for servo motors(
> > it must be timing sensitive. thats means that i need to keep track of
the current time and the time to trigger
> > the way i did is very long.
> >
> > compare current time with trigger time
> >     if equal
> >         check if pin is high or low, toggle and add either the on or off
time
> >     else
> >         see next pin,last pin then incf clock
> >     the way i do will take around 20 cycle for updating a pin with a
free running counter of 16 bits
> >     is there any way to do it in a faster manner??
> >
> >
> >
> > thanks
> >
> > regards
> > soon lee