How can we Differentiate between Dout/RDY pin. ? (Part number : ad7124-4) How can we handle interrupt. on Dout/RDY pin?

Part number : AD7124-4

I'm testing a code using Nucleo-L476RG and an analog-to-digital converter. This ADC uses SPI communication and shares its RDY (end of conversion) and DOUT functions on the same pin, that is, after reading the converted data on the pin, it becomes an RDY pin and can drive an external interrupt on the microcontroller.

My question is: how can I enable the External Interrupt event on a pin already configurated as MISO of SPI 

Since both the functionality relays on 1 common pin,  

If you have an, example code on Interrupt it will be useful for us to move further