Thanks for the replys. Unfortunately I did not explain myself properly.
I am going to be counting down a register inside the pic from 9999(dec) to
zero in 60ms
This will be the longest "count time"as it were. It may only have to count
down for 10ms.
This is then going to be displayed on 4 * 7seg displays , at a later date.
I will get to this monster later.
Thanks again.
Rob

> -----Original Message-----
> From: Don McKenzie [SMTP:don@DONTRONICS.COM]
> Sent: 27 October 1999 10:00
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: counting at 150khz (pic16c84 -04)
>
> Workshop Users wrote:
> >
> > Hi to all. I am new to using PIC's and am a but stuck.
> > I want to count down from 8999 (d) to zero in 60ms , and then repeat.
> > This works out as counting at about 150khz. Am using a pic 16c84 at
> 4Mhz.
> > I wrote a routine to do this , but as I am  a beginner my code was not
> all
> > that good:0) ,
> > and it took to many instruction cycles and was hence to slow.It needs to
> > count at
> > 1 count per 6.6us about.I can use TMR0 and I can use an external clock
> > source
> > if need be.
> > Am I going to have problems because the PIC is to slow maybe?
> > Any help would be appreciated.
> > Cheers all
> > Rob
>
> ; PULSOUT port, pin, time
> ; Generates an output pulse in 10-cycle (10 us at 4 MHz) units,
> ; based on a 16-bit (1 to 65,535) value. The pulse is the reverse
> ; of the pin's state when pulsout is called. For instance,  if the
> ; specified pin is initially 1, Pulsout will invert it to make a
> ; negative-going pulse.
>
> Half of Pulsout's 10-cycle delay is produced with nop instructions. If
> you want a 5-cycle version of Pulsout, remove the nops.
>
> found at:
> http://www.dontronics.com/convert2.html#pulsout
>
> Don McKenzie  mailto:don@dontronics.com http://www.dontronics.com
>
> Don's Download Dungeon:   http://www.dontronics.com/download.html
> Australian Electronics Ring http://www.dontronics.com/aering.html
> Win $500USD Cash. Micro design contest:  http://www.simmstick.com