Subin John wrote:
 > Re: [PIC]:Is there anyway I can use more than 4 external interrupts
on a pic16f876
 > without using any other extra IC's? I'll use 4 interrupts on rb0/int
to rb3?

You can use the portb change on interrupt, but you will not be able to
tell which one triggered the interrupt, unless it's still triggering and
you can read the port in the interrupt routine.

You might consider looking at using the timer and ccp modules.  I
haven't looked to closely, but I suspect you could set them up so a
positive or negative going pulse will trigger the interrupt.  If you use
the interrupt line on port b, the timer one (set the timer to 65535 so
it'll roll over), and the two CCP modules you should be able to not only
get four interrupt sources, but you'll be able to tell which one
triggered even if it isn't still triggering when you get to the
interrupt routine.

-Adam

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads