The last two posts showed some subtle differences.

Whenever there is a rounding off to be done - do it to the final answer and not at some intermediate point in the calculation. Reason why Rob ended up with 64613 as reload which is a shade inaccurate than Lee's 64614 against the required 64614.4.

OK in any case to get some decent accuracy, the periodic correction is a must and when doing this, both above cases can be handled.

And being a time base, using an MCU with PCA is the way to go.


Raghu