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memory window and external RAM

my program access an array stored in the external RAM,how can i view the external RAM contents during simulation in keil uvision.given below a snippet of my program.

MOV DPTR,#4500H
MOVX A,@DPTR
MOV @R0,A

-i have enabled the periodic update window option.
- do i need to use the XDATA directive,need help regarding its usage.

thank you

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