AT90CAN128 external interrupt not working

Hi, using a AT90CAN128 chip I am able to get IN07 & IN06 on pin 9 & 8. But cannot get any other interrupt pin 2 to 7. Simple arduino program

// Set Button action
attachInterrupt(digitalPinToInterrupt(StopBtn), StopEngineStart, FALLING); // All stop
attachInterrupt(digitalPinToInterrupt(IgnitionBtn), IgnitionOn, FALLING); // Ign & Start Fuel on
attachInterrupt(digitalPinToInterrupt(StartFuelBtn), StartFuelOn, FALLING); // MainFuel...

AT90CAN128 external interrupt not working