[time-nuts] 1PPS to 32.768 khz

Bob Camp kb8tq at n1k.org
Wed Oct 19 19:22:43 EDT 2016


That approach would also work fine on a “internal clock” MCU. Scratch the need for a fancy timer. You may
be down under 50 cents ….


> On Oct 19, 2016, at 7:15 PM, Mark Sims <holrum at hotmail.com> wrote:
> Here's another way to do it for a wall clock display...   set up an oscillator/divider (or even a 555 timer) to generate a frequency close to, but faster than 65536 Hz.    Setup a 16 bit counter clocked by that signal. When the 1PPS signal arrives, start the counter.  After 65536 pulses the counter will overflow... stop the counter (and set up for the next 1PPS trigger) when that happens.   The Q0 output (lowest bit) from the counter will be a burst of 32768 pulses that repeats once a second.  Use that to drive your clock.   The slight pause between bursts of 32768 pulses will not be noticed on the clock display.
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