Related Articles

# 8085 program to count total odd numbers in series of 10 numbers

• Last Updated : 07 Jun, 2018

Program – Write an assembly language program in 8085 microprocessor to count odd numbers in series of 10 numbers.

Example – Assumption – Ten 8-bit numbers are stored from starting memory location 2050. Value of count is stored at memory location 3050.

Algorithm –

1. Initialize register H with 20 and register L with 4F so that indirect memory points to memory location 204F.
2. Initialize register C with 00 and register D with 0A.
3. Increment indirect memory by 1.
4. Store value of M in accumulator A.
5. Check whether the content in A is odd or even by performing AND operation of A with 01.
6. If content of A is 01 after AND operation then number scanned was odd, If so then increment C by 01 else if content of A is 00 after AND operation then number scanned was even. Decrements D by 01.
7. Check if zero flag is not set i.e. ZF = 0 then jump to step 3 otherwise store value of C at memory location 3050.

Program –

2000LXI H 204FH <- 20, L <- 4F
2003MVI C, 00C <- 00
2007INX HM <- M + 01
2008MOV A, MA <- M
2009ANI 01A <- A (AND) 01
200BJZ 200FJump if ZF = 1
200EINR CC <- C + 01
200FDCR DD <- D – 01
2010JNZ 2007Jump if ZF = 0
2013MOV A, CA <- C
2014STA 3050M <- A
2017HLTEND

Explanation – Registers A, B, C, D, H, L are used for general purpose.

1. LXI H 204F: assign 20 to H and 4F to L.
2. MVI C, 00: assign 00 to C.
3. MVI D, 0A: assign 0A to D.
4. INX H: increment indirect memory location M by 01.
5. MOV A, M: move content of M to A.
6. ANI 01: perform AND operation of A with 01 and store the result in A.
7. JZ 200F: jump if ZF = 1 to memory location 200F.
8. INR C: increment C by 01.
9. DCR D: decrements D by 01.
10. JNZ 2007: jump if ZF = 0 to memory location 2007.
11. MOV A, C: moves the content of C to A.
12. STA 3050: store the content of A to memory location 3050.
13. HLT: stops executing the program and halts any further execution.

Attention reader! Don’t stop learning now. Get hold of all the important CS Theory concepts for SDE interviews with the CS Theory Course at a student-friendly price and become industry ready.

My Personal Notes arrow_drop_up