Hi If you run a processor with a PLL on it - be very careful. The jitter they add can be significant.
Bob On Aug 22, 2012, at 11:08 PM, Peter Bell <[email protected]> wrote: > On Wed, Aug 22, 2012 at 11:27 PM, Chris Albertson <[email protected] >> wrote: > >> >> It is very hard to write a divers in software. You have to use assembly >> language and you have to mmake sure that EVERY path in every branch is has >> exactly the same number of clock cycles. And then you have to be lucky >> that you can work out an exact integer division. >> > > It depends on what sort of processor you are using - that sort of approach > used to be > necessary when the low-cost MCUs were things like PICs that don't have > especially sophisticated on-chip timers, but even cheap devices now have > onchip > timer/counters that have reload and capture registers. Many of them also > have PLLs > on the die that are intended for clock generation but can often be abused > for other > purposes :) > _______________________________________________ > 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.
