The clock achieves 0.5ppm after some minor tinkering and burn in. 0.5ppm
is about +/- 1Hz at 4MHz and it can be measured easily. Incidentally the
clock correction factor comes into play into the reload value of what you
call a Bresenham clock. The final algorythm is a little bit different from
what I have posted.

An oven is not required, the clock works at constant temperature and
voltage. Once I replaced the no name 78L05 regulator with a S81350
everything quieted down ...

Peter

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