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  1. Maybe an XOR gate is good enough? 26285 ...

    Maybe an XOR gate is good enough?
    26285

    Sorry, no article in English. With tuning RC you can adjust the width of the impulses.

    https://de.wikipedia.org/wiki/Frequenzverdopplung_(Elektronik)
    ...
  2. A CPU, or better, software, is not the right...

    A CPU, or better, software, is not the right tool for this job. The allowed jitter is too tight. Use a dedicated chip (PLL?) or some discrete logic.
    Or maybe there is way to do that in hardware...
  3. You will alway have jitter because the core...

    You will alway have jitter because the core disables the interrupts at several places.
    That's independend of the priority.
    The only reliable way is - yes, disable all and do polling.
    Of course you...
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