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External Interrupt Priority Level Register Cortex M3

Vinayak Ray
Note: This was originally posted on 15th July 2010 at http://forums.arm.com

Hi,
I am trying to program the priority level of external interrupts but without any luck

snippet from the code
-------------------------------------------------------------------------------
#define PRI_3     ((volatile unsigned char *) (0xE000E403))
   *PRI_3 = data;
   __DSB();
------------------------------------------------------------------------------

When I try to read back the data written using

  data = *PRI_3;
  __DSB();

I don't get the expected data
Do I have to set any other registers?

Thanks
Vinayak