FWIW, the 16450 uart can interrupt on any modem line change, whether it be rising or falling.
On Wed, Nov 9, 2016 at 11:41 AM, Chris Albertson <albertson.ch...@gmail.com> wrote: > On Tue, Nov 8, 2016 at 11:08 PM, Hal Murray <hmur...@megapathdsl.net> > wrote: > > > > > g...@rellim.com said: > > > Who cares if the PPS is inverted? > > > > If the signal is NOT inverted then the raising edge will be within > nanoseconds of the UTC seconds "tick". The inverted PPS will have the > edge delayed somewhat. It is not even clear if the length of the delay is > constant. > > If using the PPS for timing and the PPS is inverted you will have to > measure the delay length an account for in the config file. > > > > > -- > > Chris Albertson > Redondo Beach, California > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.