8086 Microprocessor Instruction Sets

In this tutorial, we will learn about the different instruction sets of 8086 Microprocessor. By Uma Dasgupta Last updated : May 15, 2023

There are 8 types of instruction sets of 8086 Microprocessor. They are:

Data Transfer Instructions

S.No.	Instruction	Use
1	MOV	Copies the byte/ word from the source to the destination
2	PUSH	Puts a word at the top of the stack
3	POP	Gets a word from the top of the stack
4	PUSHA	Puts all the registers into the stack
5	POPA	Get words from the stack to all registers
6	XCHG	Exchanges the data from two locations
7	XLAT	Translates a byte in AL using a table in the memory
8	IN	Reads a byte or word from the port to the accumulator
9	OUT	Sends a byte/word from the accumulator to the port
10	LEA	Loads the address into the register
11	LDS	Loads DS register and other register from the memory
12	LES	Loads ES register and other register from the memory
13	LAHF	Loads AH with the low byte of the flag register
14	SAHF	Stores AH register to low byte of the flag register
15	PUSHF	Copies the flag register at the top of the stack
16	POPF	Copies a word at the top of the stack to the flag register

S.No.	Instruction	Use
1	ADD	Adds byte/word to word
2	ADC	Adds with carry
2	INC	Increments byte/word by 1
3	AAA	Adjusts ASCII after addition
4	DAA	Adjusts decimal after the addition/subtraction
5	SUB	Subtracts byte/word from word
6	SBB	Performs subtraction with borrow
7	DEC	Decrements byte/word by 1
8	NPG	Negates each bit of byte/word and add 1/2's complement
9	CMP	Compares 2 provided byte/word
10	AAS	Adjusts ASCII codes after subtraction
11	DAS	Adjusts decimal after subtraction
12	MUL	Multiplies unsigned byte by byte/word by word
13	IMUL	Multiplies signed byte by byte/word by word
14	AAM	Adjusts ASCII codes after multiplication
15	DIV	Divides unsigned words/bytes
16	IDIV	Divides signed words/bytes
17	AAD	Adjusts ASCII codes after division
18	CBW	Fills the upper byte of the word with the copies of sign bit of the lower byte
19	CWD	Fills the upper word of the double word with the sign bit of the lower word
20	NOT	Performs the logical NOT operation
21	ABD	Performs the logical AND operation
22	OR	Performs the logical OR operation
23	XOR	Performs the XOR operation
24	TEST	Adds the operands to update flags
25	SHL	Adds the left-shift operation
26	SHR	Adds the right-shift operation

S.No.	Instruction	Use
1	REP, REPE/REPZ, REPNE/REPNZ	Repeats the given instructions
2	MOVS, MOVSB, MOVSW	Moves the byte/word from a string to another
3	COMS, COMPSB, COMPSW	Compares two string byte/word
4	INS, INSB, INSW	Input string/byte/word from the I/O port
5	OUTS, OUTSB, OUTSW	Outputs string/byte/word
6	SCAS, SCASB, SCASW	Outputs string/byte/word
7	LODS, LODSB, LODSW	Stores the string byte into AL or string word into AX