Is PortB the only place for a hardware interrupt?

[Sophi]

Hi-
I'm using PICF877A and want to use 2 interrupts. Is Port B the only Port that supports hardware-based interrupts...as in if I push a switch, the software will interrupt.
My Port B is all used up.
Also- is there somewhere that has a list of all the PICF877A interrupts and describes them well. If you are going to direct me to the data sheet please tell me where exactly, I am lost in the 234 pages!
Thanks in advance!
SophE

[dyeatman]

Why not try page 153 (Section 14.11) interestingly enough it is titled "Interrupts"....

[Sophi]

Thanks! Exactly what I needed.
*edit: and yes the title is very interesting
S

[Sophi]

After reading the interrupt section things are still not that clear. In the PIC877A.h file it has a list of interrupts that I can use. I am still looking for a more complete description of how they work so I can decide which ones to use.
Also it is not clear (at least not to me) whether or not PortB is the only port that supports an interrupt change on a pin.

[PCM programmer]

If you need an additional "interrupt on change" interrupt, the most likely
one would be the Comparator interrupt. The comparator is on Port A.

Look in section 12.0 in data sheet for the Comparator module, and
specifically look in section 12.6 on Comparator interrupts.

[John P]

You can use the capture/compare inputs as interrupts. That's pins 1 and 2 of port C. If all you want is an interrupt on a rising or falling edge (you do have to decide which) you can just respond to the interrupt and ignore the capture data.

But I'm always dubious about multiple interrupts. If you have lots of things generating them it's easy to get bogged down if everything happens at once. Would it be possible to use a repeating timer and poll the inputs you want to monitor?

[Sophi]

Thanks JohnP and PCM!
SophE