AVR-Chat

I don't know why, I thought I understood it, but I am having difficulty
determining the correct control register bits to set to obtain the phase
correct PWM mode I wish to operate in.

  I want to have an interrupt handler set or clear a pair of GPIOs based
on the status of the PWM module.  I need two GPIOs, because I wish to
sink ~~40 mA from my LED, without using an external pass transistor
(I am working with a design which has extremely tight physical size
restrictions).

  Can someone here assist me in understanding the correct register settings
to achieve this goal?   Thanks in advance.

tom

On Oct 5, 2007, at 7:05 PM, Thomas Keller wrote:

>
> I don't know why, I thought I understood it, but I am having  
> difficulty
> determining the correct control register bits to set to obtain the  
> phase
> correct PWM mode I wish to operate in.
>
>   I want to have an interrupt handler set or clear a pair of GPIOs  
> based
> on the status of the PWM module.  I need two GPIOs, because I wish to
> sink ~~40 mA from my LED, without using an external pass transistor
> (I am working with a design which has extremely tight physical size
> restrictions).
>
>   Can someone here assist me in understanding the correct register  
> settings
> to achieve this goal?   Thanks in advance.

Am guessing that if you put the same values in OCR0A and OCR0B that  
you could get both moving together in sync. Whatever, the output pins  
have to be OCR's.

--
David Kelly N4HHE, dkelly@HiWAAY.net
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Whom computers would destroy, they must first drive mad.