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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.
Have you got memory mapped to a region encompassing that location?