8085 program to divide two 16 bit numbers

MicroprocessorMicrocontroller8085

Here we will see how to divide two 16 bit numbers using 8085.

Problem Statement

Write 8085 Assembly language program to divide two 16-bit numbers.

Discussion

8085 has no division operation. To perform division, we have to use repetitive subtraction. To perform 16-bit division, we have to do the same but for the register pairs. As the register pairs are used to hold 16-bit data.

The Divisor is stored at location FC00 and FC01, the dividend is stored at FC02 and FC03. After division, the quotient will be stored at FC04 and FC05, and the remainder will be stored at FC06 and FC07.

Input

Address
Data
FC00
8A
FC01
5C
FC02
5A
FC03
1D

 

Flow Diagram

 

Program

Address
HEX Codes
Labels
Mnemonics
Comments
F000
01, 00, 00
 
LXI B,0000H
Clear BC register pair
F003
2A, 02, FC
 
LHLD FC02H
Take the Divisor into HL first
F006
EB
 
XCHG
Exchange DE and HL
F007
2A, 00, FC
 
LHLD FC00H
Take the dividend
F00A
7D
LOOP
MOV A,L
Load L into A
F00B
93
 
SUB E
Subtract E from A
F00C
6F
 
MOV L,A
Store A into L
F00D
7C
 
MOV A,H
Load H into A
F00E
9A
 
SBB D
Subtract B from A with Borrow
F00F
67
 
MOV H,A
Store A into H again
F010
DA, 17, F0
 
JC SKIP
If CY is 1, Skip
F013
03
 
INX B
Increase B by 1
F014
C3, 0A, F0
 
JMP LOOP
Jump to Loop
F017
19
SKIP
DAD D
Add HL and DE
F018
22, 06, F0
 
SHLD FC06H
Store remainder into FC06 and FC07
F01B
69
 
MOV L,C
Load C into L
F01C
60
 
MOV H,B
Load B into H
F01D
22, 04, FC
 
SHLD FC04H
Store quotient into FC04 and FC05
F020
76
 
HLT
Terminate the program

 

Output

Address
Data
FC04
03
FC05
00
FC06
7C
FC07
04

 

 

 

 

 

 

 

 

 

raja
Published on 11-Jun-2019 10:54:17
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