Subtraction of Two 8-bit numbers

-

Aim:-

Subtraction of two 8-bit number.

Apparatus:-

Microprocessor kit.

Data:-

7501-49H
7502-32H

 

Memory address

 

Machine code

 

Mnemonics

 

Operands

 

Comments

 

7000

 

21,01,75

 

LXI

 

H, 7501 H

 

Get address of 1st no. in H-l pair

 

7003

 

7E

 

MOV

 

A,M

 

1st no. in the accumulator

 

7004

 

23

 

INX

 

H

 

Increment the content of H-l pair by 1

 

7005

 

96

 

SUB

 

M

 

Subtract 2nd number from 1st number

 

7006

 

32, 03, 75

 

STA

 

7503 H

 

Store result in 7503 H

 

7009

 

CF

 

RST-1

 

 

stop

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 the result.
S->CR->CR->address(7503)-> result

Result:-
7503-17

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