MOV

This instruction copies the source operand into the destination operand. The source operand is not modified. The flags are not affected.

Usage

MOV dest, source

The valid combinations for dest and source are:

• Register, register
• Register, memory address
• Register, immediate
• Memory address, register
• Memory address, immediate

(See operand types)

Encoding

• REGISTER to register
  1000000w, 00RRRrrr
• Memory (direct) to register
  1000000w, 01000rrr, addr-low, addr-high
• Memory (indirect) to register
  1000000w, 01010rrr
• Memory (indirect with offset) to register
  1000000w, 01100rrr, disp-low, disp-high
• Immediate to register
  1000000w, 01001rrr, data-low, data-high
• Register to memory (direct)
  1000000w, 11000rrr, addr-low, addr-high
• Register to memory (indirect)
  1000000w, 11010rrr
• Register to memory (indirect with offset)
  1000000w, 11100rrr, disp-low, disp-high
• Immediate to memory (direct)
  1000000w, 11001000, addr-low, addr-high, data-low, data-high
• Immediate to memory (indirect)
  1000000w, 11011000, data-low, data-high
• Immediate to memory (indirect with offset)
  1000000w, 11101000, disp-low, disp-high, data-low, data-high

Where w is the operand size bit. w=0 indicates 8-bit operands, and w=1 indicates 16-bit operands. When w=0, data-high is omitted (the instruction length is one byte shorter).

rrr or RRR encodes a register according to the following table:

rrr	w=0	w=1
000	AL	AX
001	CL	CX
010	DL	DX
011	BL	BX
100	AH	SP
101	CH	--
110	DH	--
111	BH	--