AVR-Chat

Larry,

Thanks for your feedback on this.  One comment, I've never seen C 
look so much like assembly :)

Adam

--- In AVR-Chat@yahoogroups.com, "Larry Barello" <yahoo@b...> wrote:
> I have used INT0, INT1, ICP and the Analog Comparator for decoding 
four
> channels of PWM at the same time (each one has selectable positive 
and
> negative edge triggers).  If you use the analog comparator, of 
course, you
> need to set the other half to vcc/2 so it takes two pins...
> 
> You can see the project here: www.barello.net/uRRC20
> 
> cheers!
> 
> -----Original Message-----
> From: Adam Bradley
> 
> Not 100% sure but it looks like using ICP on the Butterfly is out,
> whats a useful alternative for decoding PWM? External Interrupt pin?
> 
> I hope I'm answering my own question correctly - would designating a
> pin as an external interrupt be appropriate?
> 
> >From datasheet from ATMEGA169. Given -
> "The INT0 interrupts can be triggered by a falling or rising edge or
> a low level. This is set up as indicated in the specification for 
the
> External Interrupt Control Register A – EICRA. When the INT0
> interrupt is enabled and is configured as level triggered, the
> interrupt will trigger as long as the pin is held low."
> 
> This doesn't look a whole lot different to using ICP?
> Anyone?
> 
> Thanks in advance,
> Adam