Instruction set of 8085 microprocessor

 

b)Arithmetic Instruction

     Instruction  to add subtract increment or decrement data in register or memory and instruction that adjust 8 bit data for BCD arithmetic are in this group.Flag conditions change after execution of instruction of this group. This group consists of the following instructions.

1)ADDITION:-

	Instruction	Task performed
1.	ADD r	Add register(r) to accumulator.

Sr.no	Mnemonics,operand	Opcode	Byte
1	ADD A	87	1
2	ADD B	80	1
3	ADD C	81	1
4	ADD D	82	1
5	ADD E	83	1
6	ADD H	84	1
7	ADD L	85	1

	Instruction	Task performed
2.	ADD M	Add data in memory to Accumulator.

Sr.no	Mnemonics,operand	Opcode	Byte
1	ADD M	86	1

	Instruction	Task performed
3.	ADI 8 bit data	Add immediate 8 bit data to accumulator.

Sr.no	Mnemonics,operand	Opcode	Byte
1	ADI Data	C6	2

	Instruction	Task performed
4.	ADC M	Add data in memory to accumulator with carry.

Sr.no	Mnemonics,operand	Opcode	Byte
1	ADC M	8E	1

	Instruction	Task performed
5.	ADC r	Add register(r) with carry to accumulator.

Sr.no	Mnemonics,operand	Opcode	Byte
1	ADC A	8F	1
2	ADC B	88	1
3	ADC C	89	1
4	ADC D	8A	1
5	ADC E	8B	1
6	ADC H	8C	1
7	ADC L	8D	1

	Instruction	Task performed
6.	ACI 8 bit data	Add immediate 8 bit data to accumulator with carry.

Sr.no	Mnemonics,operand	Opcode	Byte
1	ACI Data	CE	2

	Instruction	Task performed
7.	DAD rp	Add (rp) to (HL) and store the result in HL pair.

Sr.no	Mnemonics,operand	Opcode	Byte
1	DAD B	09	1
2	DAD D	19	1
3	DAD H	29	1
4	DAD SP	39	1

	Instruction	Task performed
8.	DAA	Adjusts Accumulator to packed BCD after adding two BCD numbers.

Sr.no	Mnemonics,operand	Opcode	Byte
1	DAA	27	1

2)SUBTRACTION:-

	Instruction	Task performed
1.	SUB r	Subtract register(r) from accumulator.

Sr.no	Mnemonics,operand	Opcode	Byte
1	SUB A	97	1
2	SUB B	90	1
3	SUB C	91	1
4	SUB D	92	1
5	SUB E	93	1
6	SUB H	94	1
7	SUB L	95	1

	Instruction	Task performed
2.	SUB M	Subtract data in memory from Accumulator.

Sr.no	Mnemonics,operand	Opcode	Byte
1	SUB M	96	1

	Instruction	Task performed
3.	SUI 8 bit data	Subtract immediate 8 bit data from accumulator.

Sr.no	Mnemonics,operand	Opcode	Byte
1	SUI Data	D6	2

	Instruction	Task performed
4.	SBB r	Subtract register(r) with borrow from accumulator.

Sr.no	Mnemonics,operand	Opcode	Byte
1	SBB A	9F	1
2	SBB B	98	1
3	SBB C	99	1
4	SBB D	9A	1
5	SBB E	9B	1
6	SBB H	9C	1
7	SBB L	9D	1

	Instruction	Task performed
5.	SBB M	Subtract data in Memory from accumulator with borrow.

Sr.no	Mnemonics,operand	Opcode	Byte
1	SBB M	9E	1

	Instruction	Task performed
6.	SBI 8 bit data	Subtract immediate 8 bit data to accumulator with carry.

Sr.no	Mnemonics,operand	Opcode	Byte
1	SBI Data	DE	2

3)INCREMENT AND DECREMENT CONTENT OF REGISTER/REGISTER PAIR/ MEMORY:-

	Instruction	Task performed
1.	INR r	Increment the content of specified register.

Sr.no	Mnemonics,operand	Opcode	Byte
1	INR A	3C	1
2	INR B	04	1
3	INR C	0C	1
4	INR D	14	1
5	INR E	1C	1
6	INR H	24	1
7	INR L	2C	1

	Instruction	Task performed
2.	INR M	Increment the content of specified memory.

Sr.no	Mnemonics,operand	Opcode	Byte
1	INR M	34	1

	Instruction	Task performed
3.	INX rp	Increment the content of specified register pair.

Sr.no	Mnemonics,operand	Opcode	Byte
1	INX B	03	1
2	INX D	13	1
3	INX H	23	1
4	INX SP	33	1

	Instruction	Task performed
4.	DCR r	Decrement the content of specified register.

Sr.no	Mnemonics,operand	Opcode	Byte
1	DCR A	3D	1
2	DCR B	05	1
3	DCR C	0D	1
4	DCR D	15	1
5	DCR E	1D	1
6	DCR H	25	1
7	DCR L	2D	1

	Instruction	Task performed
5.	DCR M	Decrement the content of specified memory.

Sr.no	Mnemonics,operand	Opcode	Byte
1	DCR M	35	1

	Instruction	Task performed
6.	DCX rp	Decrement the content of specified register pair.

Sr.no	Mnemonics,operand	Opcode	Byte
1	DCX B	0B	1
2	DCX D	1B	1
3	DCX H	2B	1
4	DCX SP	3B	1