I have a low-power display clock application. I'd like to keep the MCU sleeping until awakened by a time update interrupt every minute, at which point it will update the display. One approach is to use an external clock to drive one of the MCU's timers which wakes the MCU on overflow. Another, potentially lower-power approach, though, would be to have an external RTC wake the MCU every minute, obviating the need to run a timer. Does anyone know of an RTC that can do this? Of course, Maxim comes to mind, but their product selector isn't amenable to this sort of search, and they have so many RTCs I'd prefer not to wade through all their datasheets. I figured someone here might know. I also sent a note to their tech support. Thanks.
Joined: Tue. Apr 1, 2003
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