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AT91SAM7X256 interrupt pending

Im using irq0 to generate an interrupt. when i debug the code, the values for SMR and SVR register are correct (as i can see in the AIC window). But the ISR is never serviced. and the pending flag for this interrupt is raised. plz help


 __irq void PIO_ISR (void)
 {
        a1++;  //this is a global variable

        *AT91C_AIC_EOICR = 0;
}