8085 program to add three 16 bit numbers stored in registers

8085MicroprocessorMicrocontroller

In this program we will see how to add three 16-bit numbers stored in register pairs.

Problem Statement

Write 8085 Assembly language program to add three 16-bit numbers stored in register pair BC, DE and HL. Store the result at DE register pair.

Discussion

In this program we are storing the 16-bit numbers into BC, DE and HL pair. We have DAD D instruction which helps to add HL and DE register pair, and store the result into HL pair. After that copy BC to DE, then again perform DAD D to add them. Finally using XCHG we are storing them into DE register pair.

Here we are adding 0502H + 1211H + 2133H = 3846H

Input

Register
Data
BC
0502
DE
1211
HL
2133

Flow Diagram

 

Program

Address
HEX Codes
Labels
Mnemonics
Comments
F000
01, 02, 05
 
LXI B,0502H
 
F003
11, 11, 12
 
LXI D,1211H
 
F006
21, 33, 21
 
LXI H,2133H
 
F009
19
 
DAD D
Add DE and HL, and Store into HL
F00A
50
 
MOV D,B
Copy B to D
F00B
59
 
MOV E,C
Copy C to E
F00C
19
 
DAD D
Add DE and HL (Actually BC), store into HL
F00D
EB
 
XCHG
Swap DE and HL
F00E
76
 
HLT
terminate the program

Output

Register
Data
DE
3846
raja
Published on 11-Mar-2019 06:58:34
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