# Free Electronic Circuits & 8085 projects

## Calculate the sum of series of odd numbers

Published on Nov 17 2009

Statement: Calculate the sum of series of odd numbers from the list of numbers. The length of the list is in memory location 2200H and the series itself begins from memory location 2201H. Assume the sum to be 16-bit. Store the sum at memory locations 2300H and 2301H.

Sample problem 1:

2200H = 4H

2201H= 9AH

2202H= 52H

2203H= 89H

2204H= 3FH

Result = 89H + 3FH = C8H

2300H= H Lower byte

2301H = H Higher byte

 Source program : LDA 2200H MOV C, A : Initialize counter LXI H, 2201H : Initialize pointer MVI E, 00 : Sum low = 0 MOV D, E : Sum high = 0 BACK: MOV A, M : Get the number ANI 0lH : Mask Bit 1 to Bit7 JZ SKIP : Don’t add if number is even MOV A, E : Get the lower byte of sum ADD M : Sum = sum + data MOV E, A : Store result in E register JNC SKIP INR D : Add carry to MSB of SUM SKIP: INX H : Increment pointer Flowchart for program

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