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Experiment 13 CA

This document outlines an assembly language program for the 8085 microprocessor to determine if an 8-bit number stored at memory location 2050 is odd or even. The program uses the ANI instruction to perform an AND operation and checks the zero flag to decide whether to store 22 or 11 at memory location 3050. The algorithm and program instructions are provided in detail, including comments on the purpose of each instruction.

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8 views2 pages

Experiment 13 CA

This document outlines an assembly language program for the 8085 microprocessor to determine if an 8-bit number stored at memory location 2050 is odd or even. The program uses the ANI instruction to perform an AND operation and checks the zero flag to decide whether to store 22 or 11 at memory location 3050. The algorithm and program instructions are provided in detail, including comments on the purpose of each instruction.

Uploaded by

mamalal346
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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Experiment :- 13

Assembly language program for checking


the that given number is odd or even
8085 program to check whether the given
number is even or odd

Problem – Write an assembly language program in 8085


microprocessor to check whether the 8 bit number which is stored at
memory location 2050 is even or odd. If even, store 22 at memory
location 3050 otherwise store 11 at memory location 3050.

Example –

A number is said to be odd if its lower bit is 1 otherwise even.


Therefore to identify whether the number is even or odd, we
perform AND operation with 01 by the help of ANI instruction. If
number is odd then we will get 01 otherwise 00 in
accumulator. ANI instruction also affect the flags of 8085. Therefore
if accumulator contains 00 then zero flag becomes set otherwise
reset.
Algorithm –
1. Load the content of memory location 2050 in accumulator A.
2. Perform AND operation with 01 in value of accumulator A by
the help of ANI instruction.
3. Check if zero flag is set, i.e if ZF = 1 then store 22 in
accumulator A otherwise store 11 in A.
4. Store the value of A in memory location 3050

Program –
MEMORY ADDRESS MNEMONICS COMMENT
2000 LDA 2050 A <- M[2050]

2003 ANI 01 A <- A (AND) 01

2005 JZ 200D Jump if ZF = 1

2008 MVI A 11 A <- 11

200A JMP 200F Jump to memory location

200D MVI A 22 A <- 22

200F STA 3050 M[3050] <- A

2012 HLT END

Explanation – Registers used A:


 LDA 2050 –loads the content of memory location 2050 in
accumulator A
 ANI 01 –performs AND operation between accumulator A and
01 and store the result in A
 JZ 200D –jump to memory location 200D if ZF = 1
 MVI A 11 –assign 11 to accumulator
 JMP 200F –jump to memory location 200F
 MVI A 22 –assign 22 to accumulator
 STA 3050 –stores value of A in 3050
 HLT –stops executing the program and halts any further
execution

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