Instructed Keil to load the "unsigned int i" in the idata area and now it behaves OK. I now can focus on other key areas in the code..

In the meanwhile is there any other simpler way to do the following ? :

  union Addsplit {unsigned int FullAddress ; 
                  unsigned char PartAddress[2];} Address;
  unsigned char j,k;    

  Address.FullAdress = 0x1234;
  j = Address.PartAddress[0];
  k = Address.PartAddress[1];
 ...
 ...

Basically I have a sixteen bit address value and I need to send it through an SPI interface as two bytes followed by the 1 byte data to be written at that address.

Thanks

Raghu