When I use Arduino mega 2560, digital pin 3 is PE5/OC3C/INT5
I am using this pin as external falling interrupt.
And I want to use Timer3 now.
I know that OC3C is output pin when timer interrupt is generated, (if I set COMnA or B or C in TCCRn register )
but I want to use this Timer3 just as timer interrupt operation, not port operation like OC3C.
In this case, Can I use both Timer3 and INT5 at the same time?
Does Timer3 function affect INT5?