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