PROBLEM USING ISR

sir, in below code how do we get to know that interrupt is enabled or not?..because in step into the control is not going to ISR .

#include<stdio.h>
#include <ADUC842.H>

sbit intr=P0^2;
void ex0_isr (void) interrupt 0
{ intr=~intr; EX0=0;
}

void main()

{

IT0 = 1; // Configure interrupt 0 for falling edge on /INT0 (P3.2)
EX0 = 1; // Enable EX0 Interrupt
EA = 1; // Enable Global Interrupt Flag

}

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