Leonardo - using I2C and external interrupts

Projects General Guidance
1

Apologies if this isn't in the appropriate forum section:

I have an Arduino Leonardo and intend to use the 2 external interrupts for monitoring pulses from 2 water flow sensors.
I also wish to connect a LCD character display (via a I2C backpack). It appears that the Leonardo's I2C connection (SDA & SCL lines) are on Digital pins 2 & 3 - which are the normal assignments for external interrupt pins.

Does this mean that it is not possible to have interfaces using both I2C and external interrupts ?
TIA
Chris.

2

The Leonardo has pin 2 and 3 combined for interrupt and I2C, but it has 2 two other (old style) interrupts:

There are also the PCINT interrupts.

http://playground.arduino.cc/Main/PcInt