How to write to external memory

I was just simulating my code in Keil. When I write to external memory, I don't see anything happen in the memory window.
I am using cypress FX2 as the chip.
Here's my code:
Just writing FF to location E000h

MOV A, #0FFH
MOV DPTR, #0E000H
MOVX @DPTR, A

I don't see anything happen at 0E000h in the memory window.

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