B.TECH(ECE/CS/EE)

1. 1
LABORATORY MANUAL OF EEC456 & EEE454
Prepared at Ashoka Institute of Technology & Management, Aktha, Sarnath, Varanasi, U.P.
With
Participation & Valuable Contributions from
Er. Anupam Kumar, ECE, HOD & Assistant Professor, AITM
(anupamkumarmtec@gmail.com)
Department of Electronics & Communication Engineering
1 To study 8085 microprocessor System
2 To study 8086 microprocessor System
3 To develop and run a program for finding out the largest/smallest number from a given set of
numbers.
4 To develop and run a program for arranging in ascending/descending order of a set of numbers
5 To develop and run a programme to compute square root of a given number
6 To perform multiplication/division of given numbers
7 To perform floating point mathematical operations (addition, subtraction, multiplication and
division)
8 To obtain interfacing of keyboard controller
9 To perform interfacing of DMA controller
10 To obtain interfacing of RAM chip to 8085/8086 based system
Textbook: Lab Manual EEC456
Additional Readings:
1. Ramesh Gaonkar,”Microprocessor Architecture, Programming, and Applications with the
8051, 5th
Edition, Penram International Publication (India) Pvt. Ltd.
2. Douglas V. Hail,” Microprocessor and Interfacing,”2nd
Edition,TMH,2006
3. User’s Guide (XPO 85/SW), ANSHUMAN Tech Pvt. Ltd.
Course Code: E E C 4 5 6
Course
Title: Microprocessors Laboratory
FACULTY NAME MR. ANUPAM KUMAR
Attendance
Weightages
CA MTE ETE
0 0 0

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 QUICK STEPS TO LEARN OPERATION WITH KIT
Step I:-Procedure to operate kit using assembly language program.
Do connections as per your figure
Switch ON power supply (i.e. SMPS (Switched mode power supply)
ANSHUMAN will be display on display board.
Press ENTER key
Go to command mode
COMMAND=
Press E
EXPAND=
Press A
2 PASS ASSEMBLER?
Press ENTER key 3 times
Files EXIST?
Press ‘N’ (No)
ARE YOU SURE?
Press ENTER KEY
C=
Press ‘W’
0001 ORG 6000H (Write your program here)
0002 MVI A, 22H
0003 MVI B, 33H
0004 ADD B
0005 RST 1
Press Ctrl key+ C
C=

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Press ‘A’ Key
Will show message save code at DSTN? Y/N
Press ‘Y’ (Yes)
C=
Press ‘ESC’ two times
COMMAND= (Go to command mode)
Execution of the program
Press ‘G’
Go to?
Press ENTER key 2 times
BURST ADDR
GIVE 6000H
Press ENTER Key
COMMAND= (Go to command mode)
Checking contents of registers
Press ‘S’
SUBSTUT?
Press ENTER key
MEMORY
Press ‘any key’ other than ‘Enter Key’ 2 times
IO REGISTER (GIVE THE NAME)
Press ENTER key
NAME

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A=55(Result i.e. 22+33=55)
 NOTE: - On Pressing Enter subsequently all registers contents will display.
 PROCEDURE TO OPERATE KIT USING DISASSEMBLER
Press E
EXPAND
Press U
Press ENTER key 3 times
STRT
Give 6000
Press ENTER
END
Give 6009
Press ENTER
DSTN
Give 6000
Press ENTER
PRINTER?
Press ‘’CTR+C’’ step by step
ABBREVIATIONS & DESCRIPTIONS:-
 S (SUBSTUT)-Use substitute command to enter program.
 Ctr+U- You can check data previously entered by pressing Ctrl-U key.
 ESC (Display COMMAND) - Come to command mode.
 CR (MEMORY) - Display first mode: Memory.
 BURST- Use to BURST Mode.
 ADDR- Asks the program address.
 COMMAND- Comes back to command mode.
 REGISTER- Display next mode: Register.
 Any key IO- Displays next mode: Input/output port.

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APPARATUS
8085 TRAINER KIT & 8085 SIMULATOR SOFTWARE

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INTERFACING STUDY CARDS

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OTHERS EXPERIMENTS
AIM: Interfacing and control of stepper motor using 8085 microprocessor.
Apparatus required: stepper motor (12 volts)
SAMPLE PROGRAM: Interface a Stepper Motor to the 8085 microprocessor system and
write an 8085 assembly language program to control the Stepper Motor.
Block Diagram:-
SOFTWARE FOR STEPPER MOTOR CONTROL:
As port A is used as an output port, control word for 8255 is 80H. Stepper Motor Control
Program: 6000H Excite code DB 03H, 06H, 09H, and OCH: This is the code sequence for
clockwise rotation Subroutine to rotate a stepper motor clockwise by 360° - Set the counts:
MVI C, 32H: Set repetition count to 50ıο
START: MVI B, 04H: Counts excitation sequence
LXI H, 6000H: Initialize pointer
BACK1: MOV A, M: Get the Excite code
OUT PORTA: Send Excite code
CALL DELAY: Wait
INX H: Increment pointer
DCR B: Repeat 4 times JNZ BACK l

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Delay subroutine:
Delay: LXI D, Count
Back: DCX D
MOV A, D
ORA E
JNZ Back RET
FLOWCHARTS: Stepper motor subroutine
Conclusion: - A stepper motor is a digital motor. It can be driven by digital signal. Fig.
shows the typical 2 phase motor rated 12V /0.67 A/ph interfaced with the 8085
microprocessor system using 8255. Motor shown in the circuit has two phases, with center-
tap winding. The center taps of these windings are connected to the 12V supply. Due to this,
motor can be excited by grounding four terminals of the two windings. Motor can be rotated
in steps by giving proper excitation sequence to these windings. The lower nibble of port A
of the 8255 is used to generate excitation signals in the proper sequence. These excitation
signals are buffered using driver transistors. The transistors are selected such that they can
source rated current for the windings. Motor is rotated by 1.80 per excitation.
EXPERIMENT
AIM Generation of delay in binary counting using 8085 microprocessor.
SAMPLE PROGRAM Write a program for displaying binary up counter. Counter should
count numbers from 00 to FFH and it should increment after every 0.5 sec.

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Source Program:
LXI SP, 27FFH: Initialize stack pointer
MVI C, OOH: Initialize counter
BACK: CALL Display: Call display subroutine
CALL Delay: Call delay subroutine
INR C: Increment counter
MOV A, C
CPI OOH: Check counter is > FFH
JNZ BACK: If not, repeat
HLT: Stop
Delay Subroutine: Delay: LXI B, count: Initialize count
BACK: DCX D: Decrement count
MOV A, E
ORA D: Logically OR D and E
JNZ BACK: If result is not 0 repeat
RET: Return to main program
Conclusion: Assume operating frequency of 8085 equal to 2MHz. Display routine is
available.

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PHOTO GALLARY: STUDENTS PERFORM EXPERIMENTS ON KIT & SIMULATOR

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LAB ASSIGNMENT
1. (A) Addition of two nos. is stored in location 20C0 & 20C1 respective & result is
stored in 20C2. (B) Subtraction of two no.
2. Write a program using 8085 microprocessor for Decimal, Hexadecimal addition and
subtraction of two numbers.
3. To perform multiplication and division of two 8 bit numbers using 8085.
4. To find the largest and smallest number in an array of data using 8085 instruction
set.
5. To write a program to arrange an array of data in ascending & descending order.
6. To convert given Hexadecimal number into its equivalent ASCII number & vice
versa using 8085.