I use « AVR-DIV » with ATTiny13a. Interest is that it works with one clock cycle instructions (instead of 4 clock cycles for PIC). So any integer divider can be used.
Seems to work as well as PIC although I did’nt formally verify. Gilles. > Le 30 avr. 2022 à 23:55, Simon Merrett <smerret...@hotmail.com> a écrit : > > I know they were unavailable from one of my usual distributors when I > checked last week. I also prefer surface mount parts and that narrows the > availability somewhat but isn't a red line for me. > > I'm very open to the idea that the PIC12F was a one-off in terms of the > timing performance. But I have also heard that modern silicon processes could > yield better results, based on informed conjecture. I am more familiar with > eg the newer ATtiny series of chips and the Microchip Cortex M series parts. > I realise that datasheet figures are often just an envelope of performance > and they don't mention jitter but the PIC12F states something like a 10 ns > gpio rise time and a recent ATtiny specs something like 1.5 ns. For the > simpler (AVR, not Arm) parts, maybe there is a whole bunch which would be > suitable. I'm happy to build some but I can't (yet) do the testing to see if > they are viable. If there are other contenders I'd be happy to look at them > too. > > Simon > ________________________________ > From: Clint Jay <cjaysh...@gmail.com> > Sent: Saturday, April 30, 2022 8:33:17 PM > To: Discussion of precise time and frequency measurement > <time-nuts@lists.febo.com> > Subject: [time-nuts] Re: Microcontroller based frequency divider > > I think the reason the PICDiv is so well regarded is because of the > specific chips used and the way the timers etc. are implemented in them. > > So, an alternate chip outside of the Microchip PIC range just might not be > capable of the performance. > > Are they in short supply? > > > >> On Sat, 30 Apr 2022 at 20:29, Simon Merrett <smerret...@hotmail.com> wrote: >> >> Dear time nuts, >> >> I'm now on this list thanks to leapseconds.com where I went looking for >> the picDIV. A wonderful device. I have a project coming up where I plan to >> cut my time-teeth and think a picDIV will be just right for one of the >> stages. >> >> However, with components in short supply these days, I wondered if a >> similar approach could be taken on an alternate, or a few alternative, >> part(s). I have a Leo Bodnar GPSDO but only a 50 MHz bandwidth oscilloscope >> (Rigol DS1054Z), which I cannot think will be sufficient to characterise an >> alternative implementation. >> >> So I was wondering if there are any time nuts who might have the >> wherewithal to measure an alternative microcontroller frequency divider >> implementation. I would think a 10 MHz division to 1PPS. I'd like to know >> jitter and delay/offset (I'm afraid I'm still not up on all the terminology >> - feel free to educate me please!) to around 100 ps accuracy (I think I >> need nanosecond accuracy in my project). I would obviously pay for shipping >> the parts to be tested and the parts themselves (most likely with power and >> coaxial signal connectors on a PCB). Please comment, even if you aren't in >> a position to offer measurement. >> >> Thank you for this community. >> >> Yours, >> >> Simon >> _______________________________________________ >> time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send >> an email to time-nuts-le...@lists.febo.com >> To unsubscribe, go to and follow the instructions there. >> > > > -- > Clint. M0UAW IO83 > > *No trees were harmed in the sending of this mail. However, a large number > of electrons were greatly inconvenienced.* > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an > email to time-nuts-le...@lists.febo.com > To unsubscribe, go to and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an > email to time-nuts-le...@lists.febo.com > To unsubscribe, go to and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.