How to arrange numbers in Descending order using Microprocessor 8085 program

In the third year of the B.Sc. Physics practical curriculum under TANSCHE, it's crucial to grasp how microprocessors work. One important experiment features the Microprocessor 8085, which is a popular 8-bit processor. In this experiment, students get to practice basic arithmetic operations.

This blog post will highlight the experiment where students arrange a series of numbers in descending order using the Microprocessor 8085. This hands-on activity helps students dive into the essential functions of the 8085 microprocessor, as well as programming logic and memory management. By completing this task, you'll develop a clear understanding of how the 8085 processes data and performs arithmetic functions, laying a strong groundwork in microprocessor systems.

Microprocessor 8085 program to arrange numbers in Descending order

Aim:

Write an assembly language program to arrange a set of numbers in descending order using microprocessor 8085.

Apparatus required:

Microprocessor 8085 kit, power supply etc

Program:

Descending order - Main program

Memory address	Machine code	Mnemonics	Operands	Comments
8000	11	LXI	D, 8601H	Memory location to store the result
8001	01
8002	86
8003	21	LXI	H, 8500H	Count address in H-L pair
8004	00
8005	85
8006	46	MOV	B, M	Move data in memory to B
8007	CD	CALL	8200H	Call the subroutine in 8200H
8008	00
8009	82
800A	12	STA	D	Store the result
800B	CD	CALL	8050H	Call the subroutine in 8050H
800C	50
800D	80
800E	13	INR	D	Increment D register
800F	05	DCR	B	Decrement B register
8010	C2	JNZ	8007H	Is B non-zero? Jump to 8007H
8011	07
8012	80
8013	76	HLT		Stop the program

Subroutine 1:

Memory address	Machine code	Mnemonics	Operands	Comments
8200	21	LXI	8500H	Count address
8201	00
8202	85
8203	4E	MOV	C, M	Count in C register to check whether all numbers have been compared
8204	97	SUB	A	Make content of accumulator zero
8205	23	INX	H	Get the next number
8206	BE	CMP	M	Compare memory with accumulator
8207	D2	JNC	820BH	Is it the largest number in the accumulator? Go to 820BD
8208	0B
8209	82
820A	7E	MOV	A, M	Get smallest number in the accumulator
820B	0D	DCR	C	Decrement the count register
820C	C2	JNZ	8205H	Is C non-zero? Go to 8205H
820D	05
820E	82
820F	C9	RET		Return to main program

Subroutine 2:

Memory address	Machine code	Mnemonics	Operands	Comments
8050	21	LXI	8500H	Count address
8051	00
8052	85
8053	4E	MOV	C, M	Count in C register to check whether all numbers have been compared
8054	23	INX	H	Get the next number
8055	BE	CMP	M	Compare memory with accumulator
8056	CA	JZ	805D	Is it the larger number in the accumulator? Go to 805D
8057	5D
8058	80
8059	0D	DCR	C	Decrement the count register
805A	C2	JNZ	8054H	Is C non-zero? Go to 8054H
805B	54
805C	80
805D	3E	MVI	A, 00	Store accumulator by 00
805E	00
805F	77	MOV	M, A	Replace the largest number by 00
8060	C9	RET		Return to main program

Example:

Arranging in descending order

        Number of data in a array 8500H - 06

First input location 8501H - 23H

Second input location 8502H - 21H

Third input location 8503H - 14H

Fourth input location 8504H - 10H

Fifth input location 8505H - 04H

Sixth input location 8506H - 18H

Result location

8601H - 23H

8602H - 21H

8603H - 18H

8604H - 14H

8605H - 10H

8606H - 04H

Procedure:

Result: 

The assembly programmes for microprocessor 8085 to arrange a set of numbers in descending order was written and executed using the microprocessor 8085 kit.

Click here for Ascending order

For further reference:
External site