On Wed, 25 Aug 2021, Mark Cave-Ayland wrote:

> 
> Unfortunately the datasheet I was using for reference doesn't appear to 
> have the relevant detail here. Have you got a reference to the datasheet 
> you're using which shows what happens to the timers at the zero crossing 
> point?
> 

The datasheets which I normally refer to (Rockwell and Synertek) agree 
about this. Also, I established the sequence experimentally when I was 
writing the clocksource drivers for Linux/m68k.

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