MOV Des, Src:
- Src operand can be register, memory location or immediate operand.
- Des can be register or memory operand.
- Both Src and Des cannot be memory location at the same time.
E.g.:
MOV CX, 037A H
MOV AL, BL
MOV BX, [0301 H]
PUSH Operand:
- It pushes the operand into top of stack.
E.g.: PUSH BX
POP Des:
- It pops the operand from top of stack to Des.
- Des can be a general purpose register, segment register (except CS) or memory location.
E.g.: POP AX
XCHG Des, Src:
- This instruction exchanges Src with Des.
- It cannot exchange two memory locations directly.
E.g.: XCHG DX, AX
IN Accumulator, Port Address:
- It transfers the operand from specified port to accumulator register.
E.g.: IN AX, 0028 H
OUT Port Address, Accumulator:
- It transfers the operand from accumulator to specified port.
E.g.: OUT 0028 H, AX
LEA Register, Src:
- It loads a 16-bit register with the offset address of the data specified by the Src.
- This instruction loads the contents of DI (offset) into the BX register.
E.g.: LEA BX, [DI]
LDS Des, Src:
- It loads 32-bit pointer from memory source to destination register and DS.
- The offset is placed in the destination register and the segment is placed in DS.
- To use this instruction the word at the lower memory address must contain the offset and the word at the higher address must contain the segment.
E.g.: LDS BX, [0301 H]
LES Des, Src:
- It loads 32-bit pointer from memory source to destination register and ES.
- The offset is placed in the destination register and the segment is placed in ES.
- This instruction is very similar to LDS except that it initializes ES instead of DS.
E.g.: LES BX, [0301 H]
LAHF:
- It copies the lower byte of flag register to AH.
SAHF:
- It copies the contents of AH to lower byte of flag register.
PUSHF:
- Pushes flag register to top of stack.
POPF:
- Pops the stack top to flag register.
