Randall - On Fri, May 02, 2008 at 12:33:03PM -0400, Randall Nortman wrote: > 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.
60 Hz mains timing is terrible. Use the crystal. The only thing mains can be used for is long-term (more than 1 day) absolute accuracy, and then only if you are really careful with both hardware and software design to avoid noise spikes, and your customer doesn't decide to run it from a generator or inverter. - Larry _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user