The 8086 microprocessor - instructions

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• The 8086 microprocessor supports 8 types of instructions
• Data Transfer Instructions
• Arithmetic Instructions
• Bit Manipulation Instructions
• String Instructions
• Program Execution Transfer Instructions (Branch & Loop Instructions)
• Processor Control Instructions
• Iteration Control Instructions
• Interrupt Instructions

The data transfer instructions are used to transfer data from one location to another. This transfer of data can be either from register to register, register to memory or memory to register.

It is important to note here that the memory to memory transfer of data directly is not possible.

Following are some instructions that are used for data transfer purpose:

1. MOV
2. PUSH
3. POP
4. XCHG
5. LAHF
6. SAHF
7. IN
8. OUT
9. LDS
10. LES

The table showing the list of data transfer instructions with Example 

OPCODE	OPERAND	EXPLANATION	EXAMPLE
MOV	D, S	D = S	MOV AX, [SI]
PUSH	D	pushes D to the stack	PUSH DX
POP	D	pops the stack to D	POP AS
PUSHA	none	put all the registers into the stack	PUSHA
POPA	none	gets words from the stack to all registers	POPA
XCHG	D, S	exchanges contents of D and S	XCHG [2050], AX
IN	D, S	copies a byte or word from S to D	IN AX, DX
OUT	D, S	copies a byte or word from D to S	OUT 05, AL
XLAT	none	translates a byte in AL using a table in the memory	XLAT
LAHF	none	loads AH with the lower byte of the flag register	LAHF
SAHF	none	stores AH register to lower byte of the flag register	SAHF
PUSHF	none	copies the flag register at the top of the stack	PUSHF
POPF	none	copies a word at the top of the stack to the flag register	POPF

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