Due and DCF77 Library

Hello
I have a Problem with the expression
I use on my Due the Pin 15 and also for the Interrupt
Is that right and where can I find that information

DCF77 DCF = DCF77(DCF_PIN,DCF_INTERRUPT);

Can I find this Information

in the SAM3X / SAM3A Series
Atmel | SMART ARM-based MCU
DATASHEET

Thy for answering!

I use on my Due the Pin 15 and also for the Interrupt
Is that right

No, you can not use the same pin for two different purposes, regardless of the board.