The first reply you gave was great info, but way more than I needed. For 
example, it was figuring out the exact period in microseconds (or some 
higher math such as that). I really don't care what the period or duty 
cycle is for my purposes, as it's just cycling an LED. My duty cycle is 
programmable from (5) to 255 (well, ignoring the two LSBs).

On the other hand, I don't think that page made mention of what 
registers to set and this and that for the basic PWM setup.

As another example, I don't need to worry about the prescaler or 
postscaler. Maybe I will for the counter, but I think changing those 
will not break my PWM code if I need to use them for the counter (and 
perhaps a prescaler of 2 or 4 might be useful for counting the fan 
pulses correctly).

Regardless, the PWM matter is water under the bridge now. But, I thank 
everyone for the replies.

Joe M.

ivp wrote:
> 
>> I was thinking/making PWM much more difficult than it is. But,
>> when you don't know squat about it, even the simple things help
> 
> I know, they really do. It's so much easier when you have something
> that works which you can experiment with
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