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Add two 8-bit numbers

Published on Nov 11 2009 // Learners

Statement: Add the contents of memory locations 4000H and 4001H and place the result in memory location 4002H.

Sample problem

(4000H) = 14H

(4001H) = 89H

Result     = 14H + 89H = 9DH


Source program

LXI H 4000H : HL points 4000H

MOV A, M : Get first operand

INX H : HL points 4001H

ADD M : Add second operand

INX H : HL points 4002H

MOV M, A : Store result at 4002H

HLT : Terminate program execution


3 - Flow chart for Add two 8-bit numbers

Note: In Program 1, direct addressing instructions are used, whereas in Program 2, indirect addressing instructions are used.

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