Data transfer instruction

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Send instructions MOV

function

The source operand （ A byte or a word ） Passed to destination operand .

The rules

1. As the source operand, the immediate can be stored in memory and general registers , But it cannot be directly stored in the segment register .
2. Memory and general registers can store each other .
3. Segment register and memory can store each other .
4. Segment registers and general registers can be stored in each other .
5. It is not allowed to transfer directly between two memories .

Code implementation

Offset address transfer instruction lea

function

Offset of the address of the de source operand , And transfer it to the destination operand .

usage

1. lea bx,a The meaning of this sentence is to a Address to bx in , A concept similar to a pointer .
2. Next you can use [bx] To get the address a Data in .

Code implementation

Stack instructions

1. Pressing stack ：push

2. Bomb stack ：pop

3. Pressing stack and bouncing stack are aimed at 16 A data （AX、BX etc. ）, Don't allow to 8 A data （AH、AL etc. ） Perform stack operation .

4. It is not allowed to stack an immediate .

   ……
   push ax
   ……
   pop ax
   ……
   

Exchange instructions XCHG

function

Exchange data in two storage spaces .

The rules

1. Operands can be words , It can also be bytes .
2. The data in the two memories cannot be exchanged directly , You can complete the exchange with the help of registers .

Code implementation