Interrupt Generation using Timer Counter AT91SAM7X256

Hi,

I am trying to do a basic use of interrupts with the AT91SAM7X256 board. As there are no LEDs in this board I am trying to turn on the Backlight of the LCD on and OFF every 1 sec using Timer Channel 1. But I have a problem with irq handler, I do not get the right asm code for the handler, can anyone help me with that please.

Thank you