>> 2 You think strobing a 7-seg is time critical?
>
>Indeed. You think it is not?
>
>One thing that I discovered when working with those 4-character
>alphanumeric LED displays from HP (used on a high-end telecom
>product) was that the slightest variation in refresh timing
>caused very visible random brightness variations. All who saw it
>agreed that it was not acceptable. This was on an 8051-clone, so
>I ended up doing a "precision reload" of the timer so that the
>only variation in display timing was the 1 or 2 machine cycles of
>jitter in the interrupt latency (and zero cumulative error).

I would believe this. And in the OP case I would wrap the 7 segment routine
around the PWM routine, so that every fall through the PWM produced the next
scan of the 7 segment display.

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