UART interrupt in ADuCM350

Hello,

i am using ADuCM350EBZ board for impedance measurement board i have applied a infinite loop on impedance measurement section in code but now i want to implement UART interrupt like when ever i press any button from my keyboard, ADuCM350 board will stop impedance measurement.

how can i implement UART interrupt in ADuCM350 impedance measurement code, please guide me . I have already read hardware  manual but i could not implement uart interrupt .