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.
Do you have to manually refresh the window?
Does the chip have SFRs, etc, that have to be properly configured to allow external memory access? If so, have you correctly configured them?
I don't see any option for refreshing the window. The EZUSB Tech ref manual says, you should be able to access these registers with a MOVX instruction.
I can't see the bytes being stored at Exxx memory location during simulation. But it does work. I just put some bytes at Exxx and loaded them to Accumulator. I do see the correct bytes in the Accumulator.