1. Data Transfer Operations
MOV
1-bit data transfer involving the CY flag
MOV C, bit
MOV bit, C
16-bit data transfer involving the DPTR
MOV DPTR, #data
5-Dec-18
Micro 8051

2. Data Transfer Instructions
MOVC
Move Code Byte
Load the accumulator with a byte from program memory.
Must use indexed addressing
MOVC
MOVC
5-Dec-18
Micro 8051

3. Data Transfer Instructions
MOVX
Data transfer between the accumulator and a byte from external data memory.
MOVX
MOVX A A
5-Dec-18
Micro 8051

4. Data Transfer Instructions
XCH
Exchange accumulator and a byte variable
XCH A, Rn
XCH A, direct
XCH
XCHD
Exchange lower digit of accumulator with the lower digit of the memory location specified.
XCHD
The lower 4-bits of the accumulator are exchanged with the lower 4-bits of the internal memory location identified indirectly by the index register.
The upper 4-bits of each are not modified.
5-Dec-18
Micro 8051

5. Data Transfer Instructions
PUSH / POP
Push and Pop a data byte onto the stack.
The data byte is identified by a direct address from the internal RAM locations.
PUSH DIRECT
POP DIRECT
5-Dec-18
Micro 8051

6. Data Transfer Instructions
MOV A,Rn Move register to accumulator 1 1
MOV A,direct Move direct byte to accumulator 2 1
MOV Move indirect RAM to accumulator 1 1
MOV A,#data Move immediate data to accumulator 2 1
MOV Rn,A Move accumulator to register 1 1
MOV Rn,direct Move direct byte to register
MOV Rn,#data Move immediate data to register 2 1
MOV direct,A Move accumulator to direct byte 2 1
MOV direct,Rn Move register to direct byte
MOV direct,direct Move direct byte to direct byte 3 2
MOV Move indirect RAM to direct byte 2 2
MOV direct,#data Move immediate data to direct byte 3 2
Move accumulator to indirect RAM 1 1
Move direct byte to indirect RAM 2 2
#data Move immediate data to indirect RAM 2 1
MOV DPTR, #data16 Load data pointer with a 16-bit constant 3 2
5-Dec-18
Micro 8051

7. Data Transfer Instructions
MOVC + DPTR Move code byte relative to DPTR to accumulator
MOVC + PC Move code byte relative to PC to accumulator
MOVX Move external RAM (8-bit addr.) to A
MOVX Move external RAM (16-bit addr.) to A
Move A to external RAM (8-bit addr.)
Move A to external RAM (16-bit addr.) 1 2
PUSH direct Push direct byte onto stack
POP direct Pop direct byte from stack
XCH A,Rn Exchange register with accumulator
XCH A,direct Exchange direct byte with accumulator 2 1
XCH Exchange indirect RAM with accumulator 1 1
XCHD Exchange low-order nibble indir. RAM with A 1 1
5-Dec-18
Micro 8051