MOVX: Transfer data between the A accumulator inside the microcontroller and the external data memory (external RAM).
MOVC:
In other words, MOVX and MOVC refer to two different memories, one is off-chip data memory and the other is program memory.
Since the addresses of the internal and external ROM are continuous, only one instruction, MOVC, is sufficient; the address parts (0000H-00FFH) of the on-chip data memory and the off-chip data memory overlap, so MOV and MOVX are used to distinguish them.
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