Dr Skip wrote:
> Why wouldn't this be a good application for a separate osc.? Even a 555 can be 
> freq and pwm varied by an input IIRC...
> 
> Assuming the pic will be doing a few other 'higher level' things, using it for 
> this too seems a waste of horsepower and added code complexity,

The complexity is just 5-10 extra instructions in some
initialization routine to setup the PWM module. After that
is done, there isn't one single instruction cycle "wasted"
on it any more.

> which is 
> sometimes more risky than a simple bit o' hardware. If it's dedicated to this 
> function, the 555 is a cheaper substitute.

Adding to something can never make the total sum less.

Jan-Erik.


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