| 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 |
