| Operation: | MOVX |
| Function: | Move Data To/From External Memory (XRAM) |
| Syntax: | MOVX operand1,operand2 |
| Instructions | OpCode | Bytes | Cycles | Flags |
| MOVX @DPTR,A | 0xF0 | 1 | 2 | None |
| MOVX @R0,A | 0xF2 | 1 | 2 | None |
| MOVX @R1,A | 0xF3 | 1 | 2 | None |
| MOVX A,@DPTR | 0xE0 | 1 | 2 | None |
| MOVX A,@R0 | 0xE2 | 1 | 2 | None |
| MOVX A,@R1 | 0xE3 | 1 | 2 | None |
Description: MOVX moves a byte to or from External Memory into or from the Accumulator.
If operand1 is @DPTR, the Accumulator is moved to the 16-bit External Memory address indicated by DPTR. This instruction uses both P0 (port 0) and P2 (port 2) to output the 16-bit address and data. If operand2 is DPTR then the byte is moved from External Memory into the Accumulator.
If operand1 is @R0 or @R1, the Accumulator is moved to the 8-bit External Memory address indicated by the specified Register. This instruction uses only P0 (port 0) to output the 8-bit address and data. P2 (port 2) is not affected. If operand2 is @R0 or @R1 then the byte is moved from External Memory into the Accumulator.
See Also: MOV, MOVC, Instruction Set