8085 program to add three 16 bit numbers stored in registers

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
Updated on: 2019-07-30T22:30:25+05:30

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