Re: [avr-chat] PWM, to fast!

[Jeff Epler]

I'm not sure your math is right.  I figure that 8MHz / 128 is 62.5kHz,
not 62500kHz.

As far as I understand PWM on AVR, the counter is incremented
every PRESCALER clocks.  On the 8535, the timer/counter 1 says it is
"true 16-bit design", so the full period is 65536 increments.  That is
actually right around 1Hz when using the biggest prescaler.

If you use Fclk_io=8MHz, TOP=33332, N=8, you will get 30.0003Hz as the PWM
frequency.  See page 102 of the datasheet (revision 2502E-12/03 here)  I
believe you then set the OCR1H and OCR1L to values from 0..TOP to change
the "on" time.

Jeff

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