If the 20ns+ pulse can be between 200ns and 1us, then it's no problem
at all.  Just a few delay routines.

Regards,

Jim

> -------- Original Message --------
> Subject: Re: [Pic] Making a special timer!
> From: "Richard R. Pope" <mechanic_2@charter.net>
> Date: Fri, July 18, 2014 10:39 am
> To: "Microcontroller discussion list - Public." <piclist@mit.edu>
>=20
>=20
> Bob,
>      OK. But how do I do this? I want to put out a one second high pulse=
=20
> and then pull it low. Then I want to wait for 15 seconds. Next I want to=
=20
> output a high for at least 20ns. Output the one second pulse, wait for=20
> 15 seconds, output the 20+ns pulse, output the one second pulse, and=20
> continue doing this forever.
> Thanks,
> rich!
> P.S. I will eventually add an ADC to control how long we wait before we=20
> output the 20+ns reset pulse and then the one second gating pulse.
> rich!
>=20
> On 7/18/2014 10:09 AM, Bob Ammerman wrote:
> > Why are we talking about timers at all? It is a pain in the next to get=
 an
> > instruction cycle accurate pulse when using a timer. It is much easier =
to
> > generate a pulse of an exact number of instruction cycles using a delay
> > loop.
> >
> > ~ Bob Ammerman
> > RAm Systems
> >
> > -----Original Message-----
> > From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behal=
f Of
> > Allen Mulvey
> > Sent: Friday, July 18, 2014 10:40 AM
> > To: 'Microcontroller discussion list - Public.'
> > Subject: RE: [Pic] Making a special timer!
> >
> > MikroElektronika has a free Timer Calculator that you can use to get th=
e
> > code to set up your timer. I don't understand why anyone would want to =
use a
> > PWM when the timer is so easy and quite accurate. Check this out:
> > http://www.libstock.com/projects/view/398/timer-calculator
> >
> >
>=20
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