Int0 and PCINT0...

Are there any issues with using INT0 and PCINT0 at the same time on an ATTINY85 that I should be aware of? Can't really find a good example of what I'm trying to do. I have to use an Uno to program so it's a bit of a pain in the ass, I want to make sure everything is good first.

I use INT0 with an infrared photo-transistor to read pulses from a smart meter. PCINT0 will go to a hall effect sensor on my water softener flow meter. I measure time between pulses for smart meter, and count to 50 or 1 quart on flow meter. Currently pulse meter and DS18B20's are on ATTINY85 and the water softener is on the Uno.

Thanx.

I don't know the answer to your question, but I do wonder if you need to use interrupts at all as the frequency of pulses sounds very low.