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Can I use the MOVX instruction with R0 or R1 to access external 512 kbytes RAM memory?

April 26, 2017external instruction KBytes memory movx r0 r1 RAM

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Can I use the MOVX instruction with R0 or R1 to access external 512 kbytes RAM memory?

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No…because the MOVX with R0 or R1 can only address 256 bytes of external memory/RAM. However, there is another solution. You can use the DPTR data pointer with MOVX to access external 512 bytes memory/RAM.