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how to enable xdata in P87C51RD+

hi
to use on chip xram of my p87c51RD+. I have made following changes in my code which are recomended here.
http://www.keil.com/support/docs/1758.htm
but my code stuck on this loop.

IDATALOOP:	MOV	@R0,A
		DJNZ	R0,IDATALOOP
regards
Farhan
I have also posted this messege on
http://www.8052.com/forum/read.phtml?id=79977&top=79977

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