AVR - is it possible to set interrupts on a port instead of a pin?

[kolonelkadat]

Im using an atmega 328p with a small keypad attached. The keypad is attached to port C (analog 0-5).

What I would like to do is have an interrupt that wakes the microcontroller when any of the keys are pressed. Is there a way to do this?

[ve7xen]

Pin Change interrupt. Should be available on most pins, and you can enable many at once. Only one ISR is fired regardless of which pin changes, you then need to poll to figure out which one(s) were triggered.

Didn't actually read the link, but this looks like it covers it: https://sites.google.com/site/qeewiki/books/avr-guide/external-interrupts-on-the-atmega328

[kolonelkadat]

perfect! thanks.

[dannyf]

Is there a way to do this?

OR those pins into one single interrupt pin - check to make sure that it can wake up the mcu from your sleep mode.

[SirNick]

Uhh, I don't see any advantage to using external logic when the PCInt method is exactly what the OP is looking for... ?

[Jeroen3]

The PCINT is probably incapable of creating a wake-up from deep sleep. This is probably exclusively for the INT pins.

[Psi]

The PCINT is probably incapable of creating a wake-up from deep sleep. This is probably exclusively for the INT pins.

nope, PCINT can wake up an AVR from all sleep states.
PCINT is a true interrupt, like INTx.