Arithmetic Op 8086

8/8/2019 Arithmetic Op 8086

1/6

1

EC2308: MICROPROCESSOR AND MICROCONTROLLER LAB

Exp. No:Basic Arithmetic Operations on two 16-bit data

Date:

Aim:

To write an assembly language program to find the sum, difference and product of two 16-bit numbers and to divide a 16-bit number by another 16-bit number.

Apparatus Required:

Intel 8086 based ESA 86 Trainer Kit.

Algorithm:

a. Sum of two 16-bit numbers1 Initialize the BX register with the offset of the starting address of the data.

2 Initialize the CL register with 00H to monitor whether the result will have acarry or not.

3 Move the first operand to Accumulator (AX) from external data memory.

4 Update the BX register to access the second operand.

5 Add the content Memory pointed by BX Register with the current content ofAccumulator.

6 Check whether there is a carry. If there is no carry jump to Step 8 otherwisecontinue.

7 Increment CL register content by 1.

8 Update the BX register to store the results.

9 Move the content of Accumulator to the next external data memory locations.10 Move the content of CL register in to the next external data memory location.

11 Stop the program execution

b. Sum of two 16-bit numbers1 Initialize the BX register with the offset of the starting address of the data.

2 Initialize the CL register with 00H to monitor whether the result will have aborrow or not.


4 Update the BX register to access the second operand.

5 Subtract the content Memory pointed by BX Register with the current content ofAccumulator.

6 Check whether there is a carry. If there is no carry jump to Step 9 otherwisecontinue.

7 Find the twos complement of Accumulator content

8 Increment CL register content by 1.

9 Update the BX register to store the results.

10 Move the content of Accumulator to the next external data memory locations.

11 Move the content of CL register in to the next external data memory location.

12 Stop the program execution.


2/6

2


c. Product of two 16-bit numbers1 Initialize the SI register with the offset of the starting address of the data.


3 Update the SI register to access the second operand.

4 Multiply the content Memory pointed by SI Register with the content ofAccumulator.

5 Update the SI register to store the results.

6 Move the content of Accumulator (AX) to the next external data memorylocations. (lower word of product)

7 Move the content of DX register in to the next external data memory locations.(higher word of product)


d. Division Operation of two 16-bit numbers1 Initialize the SI register with the offset of the starting address of the data.


3 Convert the word operand in AX register to double word operand.

4 Update the SI register to access the second operand.

5 Divide the content of Accumulator by the content Memory pointed by SIRegister.

6 Update the SI register to store the results.

7 Move the content of Accumulator (AX) to the next external data memorylocations. (quotient)

8 Move the content of DX register in to the next external data memory locations.(remainder)



3/6

3


Program Name: 8086 Basic Arithmetic Operations on 16-bit Binary Data

Address Hex codes Label Mnemonic Operands Comments

a. Sum of two 16-bit binary data2000 B1 00 MOV CL, 00H [CL] 00 H

2002 BB 00 30 MOV BX, 3000H [BX] 3000 H

2005 8B 07 MOV AX, [BX] [AX] [ [BX] ]

2007 03 47 02 ADD AX, [BX]+02H[AX]

[AX] + [ [BX]+02 ]

200A 73 02 JNC SKIPCheck for carryflag

200C FE C1 INC CLIncrement CL reg.by 1

200E 89 47 04 SKIP MOV [BX]+04H, AX [[BX]+04] [AX]

2011 88 4F 06 MOV [BX]+06H, CL [[BX]+04]

[CL]

2014 F4 HLT Halt

b. Difference of two 16-bit binary data2000 B1 00 MOV CL, 00H [CL] 00 H

2002 BB 00 30 MOV BX, 3000H [BX] 3000 H

2005 8B 07 MOV AX, [BX] [AX] [ [BX] ]

2007 2B 47 02 SUB AX, [BX]+02H[AX]

[AX] - [ [BX]+02 ]

200A 73 04 JNC SKIPCheck for carryflag

200C F7 D8 NEG AXTake 2scomplement of[AX]

200E FE C1 INC CLIncrement CL reg.

by 1

2010 89 47 04 SKIP MOV [BX]+04H, AX [[BX]+04] [AX]

2013 88 4F 06 MOV [BX]+06H, CL [[BX]+04] [CL]

2016 F4 HLT Halt

Page .. of


4/6

4


Program Name: 8086 Basic Arithmetic Operations on 16-bit Binary Data

Address Hex codes Label Mnemonic Operands Comments

c. Product of two 16-bit binary data2000 BE 00 30 MOV SI, 3000H [SI] 3000 H

2003 8B 04 MOV AX, [SI] [AX] [ [SI] ]

2005 8B 4C 02 MOV CX, [SI]+02H [CX] [ [SI]+02 ]

2008 F7 E1 MUL CX[DX.AX]

[AX] [CX]

200A 89 44 04 MOV [SI]+04H, AX [[SI]+04] [AX]

200D 89 54 06 MOV [SI]+06H, DX [[SI]+06] [DX]

2010 F4 HLT Halt

d. Division Operation of two 16-bit binary data2000 BE 00 30 MOV SI, 3000H [SI] 3000 H

2003 8B 04 MOV AX, [SI] [AX] [ [SI] ]

2005 99 CWD

Extend the signbit of AX reg toall bits of DX reg.

2006 8B 4C 02 MOV CX, [SI]+02H [CX] [ [SI]+02 ]

2009 F7 F1 DIV CX[AX.DX]

[AX] [CX]

200B 89 44 04 MOV [SI]+04H, AX [[SI]+04] [AX]

200E 88 54 06 MOV [SI]+06H, DX [[SI]+06] [DX]

2011 F4 HLT Halt

Page .. of


5/6

5


Sample Input & Output:

a.Sum of two 16-bit binary dataData: Op1: 7867h and Op2: 9A89h

Input Output

Address (EA) Data Address (EA) Data

3000 67 3004 F0

3001 78 3005 12

3002 89 3006 01

3003 9A 3007

Result: Sum: 12F0 H and Carry: 01 H

b. Difference of two 16-bit binary dataData: Op1: 9A89h and Op2: 7867h

Input Output


3000 89 3004 22

3001 9A 3005 223002 67 3006 00

3003 78 3007

Result: Difference: 12F0 H and Borrow: 01 H

c. Product of two 16-bit binary dataData: Op1: 7A89h and Op2: 2222h

Input Output


3000 89 3004 1F

3001 7A 3005 65

3002 22 3006 AE

3003 22 3007 48

Result: Product: 48AE 651F H


6/6

6


d. Division of 16-bit binary data by another 16-bit binary dataData: Op1: 7A89h and Op2: 2222h

Input Output

Address (EA) Data Address (EA) Data3000 89 3004 03

3001 7A 3005 00

3002 22 3006 23

3003 22 3007 14

Result: Quotient: 0003 h; Remainder: 1423 h

Result:

Documents

Arithmetic Op 8086