Hi James: Can you point me to an example Bulletin C?
Have Fun, Brooke Clarke w/Java http://www.PRC68.com w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml http://www.precisionclock.com James Maynard wrote: >On receipt of Bulletin C, can you arm this clock to display the upcoming >leap second? That's a feature that I would desire. > >Brooke Clarke wrote: > > >>Hi: >> >>I've got the Precision Clock to work and have some questions about the >>priority of the features. As it is now the clock allows user selection >>of the input frequency at power up that determines the instruction clock >>for the PIC micro controller. The choices are 2.5, 5, 10 or 20 Mhz. >>The clock displays on line one HH:MM:SS and on line two Day of Week, >>YYYY, Mon, Day of Month. The leap year testing uses the 4, 100 and 400 >>year rules and so you can determine the day of the week for any Georgian >>calendar (1583 onwards) date. >> >>Setting is by means of 4 buttons, Right, Left, Increment, Decrement. >>This is very intuitive and quick. During setting the clock continues to >>keep time. Also a new data field to the right of the seconds appears as >>4 hex digits to allow moving the LED/1 PPS output pulse in 1 ms steps. >> >>If the input frequency fails then all the fields that can blink do blink >>and the clock stops. Pressing and holding Right or Left for a few >>seconds clears the blinking and restarts the clock using the input >>frequency that was selected at power up. >> >>For more see: >>http://www.pacificsites.com/~brooke/PRC68COM.shtml#PC3 >> >>Now for the possible next features to be added. It would be nice to get >>some feel for how important they are: >> >>(1) Synchronize the 1 PPS output rising edge to be near a 1 PPS input >>pulse on a one time basis (the 1 PPS edge will have an error of a few >>instruction cycles which are each 4/Fin long). If this was done the >>manual setting would be removed. >> >>(2) Add another mode of operation where the clock runs on it's internal >>RC oscillator and the timing is determined by an external 1 PPS that >>needs to always be connected. >> >>(3) Add a backup Real Time Clock with it's own coin cell battery to >>allow using the clock in a portable application and allow the clock to >>be shipped while running. The chip has a 0.1 ppm aging trim capability >>and there could be a provision to automatically trim it when one of the >>above precision input frequencies is applied for maybe a day. Then when >>the input frequency is disconnected the clock would continue to tell the >>time. There are also many options for alarms. >> >>(4) Other displays such as fractional Julian Day number, fractional >>Modified Julian Day number. sidereal time, or ??? >> >>I don't think there's enough memory for all of the above, probably only >>one or two of them so I'm hoping to get some input on the priorities. >> >>Have Fun, >> >>Brooke Clarke >> >> >> > > > > _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
