Nick, can the Attiny25 divide down a 20Mhz input. I understand the 12fxxx pics max out at 20Mhz on a input so not sure if they would be suitable for my purpose. Can't seem to find anything in the datasheet for the tiny that explains the maximum frequency on a input pin.
-=Bryan=- > Date: Wed, 13 Jan 2016 12:12:39 -0800 > To: [email protected]; [email protected] > Subject: Re: [time-nuts] Generating a solid PPS from 10Mhz source > From: [email protected] > > Just shy of a half dozen folks have asked, so I'll post here as soon as I > finish cleaning it up. I'll put it on Github when it's ready. I just need a > day or two. > > Sent from my iPhone > > > On Jan 13, 2016, at 6:43 AM, Nick Sayer via time-nuts <[email protected]> > > wrote: > > > > If anyone is interested in the equivalent functionality using an ATTiny25 > > (for instance, if you’re already heavily invested in AVR instead of PIC, > > like I am), ping me. I’ve privately written code to solve almost the same > > problem and it could easily be adapted into doing the same job. > > > >> On Jan 13, 2016, at 5:23 AM, Edesio Costa e Silva > >> <[email protected]> wrote: > >> > >> Hi! > >> > >> Try TVB's picDiv at http://www.leapsecond.com/pic/picdiv.htm > >> > >> Edésio > >> > >>> On Wed, Jan 13, 2016 at 09:22:09AM +0000, Jerome Blaha wrote: > >>> Hey Guys, > >>> > >>> Is there an easy circuit to build that can consistently deliver a 1 PPS > >>> from a 10MHz source with excellent resolution and repeatability? My > >>> first application is to test different 10MHz oscillators without a TIC > >>> always attached and then compare the PPS output change over time against > >>> a master GPSDO PPS with an HP53132A. > >>> > >>> The circuit used for PPS generation would have to deliver consistent PPS > >>> output with preferably not more than 100ps noise or jitter, assuming a > >>> perfect source. I'm totally guessing that for this resolution, the PPS > >>> would have to be generated and accurate to within 0.001Hz every second. > >>> If this is too difficult, maybe the integration time can be increased to > >>> generate one pulse every 10second or every 100,000,000.00 cycles? > >>> > >>> Finally, is a square 10Mhz reference any better in this case than a > >>> sinusoidal input for generating the PPS? > >>> > >>> Thanks, > >>> Jerome > >>> > >>> _______________________________________________ > >>> time-nuts mailing list -- [email protected] > >>> To unsubscribe, go to > >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >>> and follow the instructions there. > >> _______________________________________________ > >> time-nuts mailing list -- [email protected] > >> To unsubscribe, go to > >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >> and follow the instructions there. > > > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
