Just a quick non-gEDA design question -- I have the choice between using the zero crossings of the 60Hz mains voltage or my MCU clock (generated from an 18.432MHz quartz crystal producing a 48MHz CPU clock via PLL built into the MCU) for low-resolution timing. The crystal is not designed as a watch crystal, so its tolerance is probably pretty poor, and furthermore this board will see wide temperature swings, which I think has an affect on the crystal frequency as well. I have no idea how precise the 60Hz line frequency from the power utility is, but it at least is probably not temperature-dependant. Either one is easy to use -- I just want to be as accurate as possible.
Anybody have suggestions? TIA, -- Randall _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
