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8052 Instruction Set
E-17
8052 Instruction Set
MOV DPTR Move value into DPTR
Syntax MOV DPTR,#data16
Instructions OpCode Bytes Cycles Flags
MOV DPTR,#data16 0x90 3 2 None
Sets the value of the data pointer (DPTR) to the value data16.
See also: MOVX, MOVC
MOVC Move Code Byte to Accumulator
Syntax MOVC A,@A+register
Instructions OpCode Bytes Cycles Flags
MOVC A,@A+DPTR 0x93 1 2 None
MOVC A,@A+PC 0x83 1 1 None
MOVC moves a byte from code memory into the accumulator. The code
memory address that the byte is moved from is calculated by summing the val-
ue of the accumulator with either DPTR or the PC. In the case of the program
counter, PC is first incremented by 1 before being summed with the accumula-
tor.
See also: MOV, MOVX
MOVX Move Data to/from External RAM
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
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, the byte is moved from external memory into the accumulator.
See also: MOV, MOVC