> PWM period = [(PR) + 1] * 4 * TOSC * (TMR2 prescale value)
>
> The maximum is when PR and TMR2 prescaler are at their highest values:
> Longest PWM Period = [1023 + 1] * 4 * [ 1 / 4,000,000 ] * 16

What is "PR" and where did that 1023 come from?  The only thing that fits is
the timer 2 period value, which can cause a divide by 256 at most, not 1024.


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