What is the difference between Movx and Movc in 8051 microcontroller?

The MOVX Instruction This instruction is used to transfer data between external RAM and internal register A. The MOVC Instruction The letter C is added to the MOV to highlight the use of the opcode for moving data from the source address in the Code ROM to the A register in the 8051.

What is Movc in assembly language?

Description: MOVC moves a byte from Code Memory into the Accumulator. The Code Memory address from which the byte will be moved is calculated by summing the value of the Accumulator with either DPTR or the Program Counter (PC).

What is Movc in 8051?

The MOVC instruction moves a byte from the code or program memory to the accumulator. See Also: MOV, MOVX.

What is the basic difference between ADD and ADDC instruction?

ADD and ADDC function identically except that ADDC adds the value of operand as well as the value of the Carry flag whereas ADD does not add the Carry flag to the result.

What is DJNZ in microcontroller?

Home » Instructions » DJNZ. The DJNZ instruction decrements the byte indicated by the first operand and, if the resulting value is not zero, branches to the address specified in the second operand.

What is Movx in microcontroller?

Home » Instructions » MOVX. The MOVX instruction transfers data between the accumulator and external data memory. External memory may be addressed via 16-bits in the DPTR register or via 8-bits in the R0 or R1 registers. When using 8-bit addressing, Port 2 must contain the high-order byte of the address.

What is the difference between Lcall and Acall instructions?

ACALL (Absolute Call) The difference between the ACALL and LCALL is that the target address for LCALL can be anywhere within the 64K-bytes address space of the 8051, while the target address of CALL is within a 2K-byte range.

What is the operation of following instruction in 8051 microcontroller Movc a @A DPTR?

MOVX A, @DPTR This instruction will copy the contents of external data memory location, pointed by DPTR to the accumulator. MOVX @Ri, A This instruction will copy the contents of the accumulator to the external data memory location pointed by register Ri of selected register bank.

What is Movx?

The MOVX instruction transfers data between the accumulator and external data memory. External memory may be addressed via 16-bits in the DPTR register or via 8-bits in the R0 or R1 registers. When using 8-bit addressing, Port 2 must contain the high-order byte of the address.