Addition of two 16-bit numbers

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Aim:-

Addition of two 8-bit numbers.

Apparatus:-

Microprocessor kit.


Data:-

7501-98H, LSB's of 1st number
7502-5B, MSB's of 1st number
7503-4CH, LSB's of 2nd number
7504-8EH, MSB's of 2nd number

 

Memory address

 

Machine code

 

Labels

 

 

Mnemonics

 

Operand

 

Comments

 

7000

 

2A,01,75

 

 

LHLD

 

7-501H

 

1st  16-bit no. in H-L pair

 

7003

 

EB

 

 

XCHG

 

 

Get 1st no. D-E pair

 

7005

 

2A,03,75

 

 

LHLD

 

7503H

 

2nd 16-bit no. in H-l pair

 

7007

 

0E,00

 

 

MVI

 

C,00

 

MSB’s of the sum in register C initial value= ∞

 

7009

 

19

 

 

DAD

 

D

 

1st no. + 2nd no.

 

700A

 

D2, OE,70

 

 

INC

 

AHEAD

 

Is carry? No, go to the label AHEAD

 

700D

 

OC

 

 

INR

 

C

 

Yes, increment C

 

700E

 

22,05,75

 

AHEAD

 

SHLD

 

7505H

 

Store LSB’s of a sum in 7505 and 7506H

 

7011

 

79

 

 

MOV

 

A.C

 

MSB’s of a sum in accumulator

 

7012

 

32,07,75

 

 

STA

 

7507H

 

Store MSB’s of a sum in 7507H

 

7015

 

CF

 

 

HLT

 

 

HALT



Procedure:-

1)How to enter the program
Esc->S->CR->CR->S address (7000)->CR->Esc->S->CR->CR->Data->CR

2)How to execute the program
Esc-> Go-> CR->CR->S. address -> CR

3)How to check results
S-> CR->CR->Address (7505)->CR


Result:-

7505-E4, LSB's of sum
7506+E9, LSB's of sum
7507-00, MSB's of sum

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