Ece Lab Manual Ece 315

LABORATORY MANUAL ECE 315 MICROPROCESSOR BASED SYSTEM DESIGN LABORATORY 1 TABLE OF CONTENTS S. No. Title of the Experiment Perform the following using 8085 Simulator and 8085 Microprocessor kit in assembly language: (i). Write a program to add two 8-bit numbers. (Or) Write a program to add two 16- bit numbers. (ii) Write a program to subtract two 8-bit numbers. (Or) Write a program to subtract two 16-bit numbers.

Perform the following using 8085 Simulator and 8085 Microprocessor kit in assembly language: (i) Write a program to multiply two 8 bit numbers by repetitive addition method (Or) Write a program to multiply two 8 bit numbers by rotation method. (ii)Write a program to divide 16-bit number by 8-bit number. Perform the following using 8085 Simulator and 8085 Microprocessor kit in assembly language: (i) Finding 1’s and 2’s complement of an 8-bit number. (ii) Finding 1’s and 2’s complement of an 16-bit number.

Perform the following using 8085 Simulator and 8085 Microprocessor kit in assembly language: (i) Write a program to count number of 1’s in a program. (ii) Split hex data into two nibbles and swap the higher nibble and lower nibble of that number. Write a program to convert a 2-digit BCD number into its binary equivalent number. Perform the following using 8085 Simulator and 8085 Microprocessor kit in assembly language: (i) Write a program for displaying BCD down counter. Counter should count numbers from 99 to 00 and it should increment after every 1 sec. (ii) Write a program for displaying binary up counter.

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Write a program to subtract two 8-bit numbers. (Or) Write a program to subtract two 16-bit numbers. Equipment required: 8085 microprocessor kit 2. Learning Objective: a. To acquaint with 8085 microprocessor performance. b. To determine the addition and subtraction of two numbers. 3. Program Program ( i. a ): Program (i. b): 3 Program ( ii. a): 4 Program ( ii. b ): 5 4. Required Results: Input: 1st number: …………. 2nd number: ………… Output: Addition of two numbers: ………. Subtraction of two numbers: …….. 5. Cautions: a. Before enter the program press RST key on 8085 kit. b. Proper care must be taken while handling the microprocessor kit. . Learning outcomes: Mathematical operations using 8085 kit. 6 Experiment 2 1. Aim: Perform the following using 8085 Simulator and 8085 Microprocessor kit in assembly language: i. Write a program to multiply two 8 bit numbers by repetitive addition method (or) write a program to multiply two 8 bit numbers by rotation method. ii. Write a program to divide 16-bit number by 8-bit number. Equipment required: 8085 Microprocessor kit. 2. Learning Objective: a. To acquaint with 8085 microprocessor performance. b. To determine the division and multiplication of two numbers. 3. Program Program (i. a): 7 Program ( i. b): 8 Program (ii):

MVI E, 00 : Quotient = 0 LHLD 2200H : Get dividend LDA 2300 : Get divisor MOV B, A : Store divisor MVI C, 08 : Count = 8 NEXT: DAD H : Dividend = Dividend x 2 MOV A, E RLC MOV E, A : Quotient = Quotient x 2 MOV A, H SUB B : Is most significant byte of Dividend > divisor JC SKIP : No, go to Next step MOV H, A : Yes, subtract divisor INR E : and Quotient = Quotient + 1 SKIP:DCR C : Count = Count – 1 JNZ NEXT : Is count =0 repeat MOV A, E STA 2401H : Store Quotient Mov A, H STA 2410H : Store remainder HLT : End of program. 9 4. Required Results: Input: 1st number: ……… 2nd number: ……… Output: Multiplication of two numbers: …….

Division of two numbers: …….. 5. Cautions: a. Before enter the program press RST key on 8085 kit. b. Proper care must be taken while handling the microprocessor kit. 6. Learning outcomes: Mathematical operations using 8085. 10 Experiment 3 1. Aim: Perform the following using 8085 Simulator and 8085 Microprocessor kit in assembly language: i. Finding 1’s and 2’s complement of an 8-bit number. ii. Finding 1’s and 2’s complement of an 16-bit number. Requirements: 8085 Microprocessor kit. 2. Learning Objective: Complement of a number using 8085 kit. 3. Assembly language: Program (i. a): Program (i. b): 11

Explanation: ?? This program finds the 2’s complement of an 8-bit number stored in memory location 3000H. ?? Let us assume that the operand stored at memory location 3000H is 85H. ?? The operand is moved to accumulator from memory location 3000H. ?? Then, its complement is found by using CMA instruction. ?? One is added to accumulator by incrementing it to find its 2’s complement. ?? The result is stored at memory location 3001H. Program (ii. a): Explanation: ?? This program finds the 1’s complement of 16-bit number stored in memory 3000H3001H. ?? There is no direct way to find 1’s complement of 16-bit number.

Therefore, this can be accomplished by finding the 1’s complement of two 8-bit numbers. ?? Let us assume that the operand stored at memory locations 3000H-3001H is 45H-6AH. ?? The operand is loaded into H-L pair from memory locations 3000H-3001H. ?? The lower-order is moved from register L to accumulator. ?? Its complement is found by using CMA instruction. ?? The result obtained is moved back to register L. ?? Then, the higher-order is moved from register H to accumulator. ?? Its complement is found by using CMA instruction. ?? The result obtained is moved back to register H. ??

Now, the final result is in H-L pair. 12 ?? The result is stored from H-L pair to memory locations 3002H-3003H. Program (ii. b): Explanation: ? ? ? ? ? ? ? ? ? ? ? ? ? This program finds the 2’s complement of 16-bit number stored in memory locations 3000H- 3001H. There is no direct way to find 2’s complement of 16-bit number. Therefore, this can be accomplished by finding the 1’s complement of two 8-bit numbers and then incrementing it to get 2’s complement. Let us assume that the operand stored at memory locations 3000H-3001H is 12H05H. The operand is loaded into H-L pair from memory locations 3000H-3001H.

The lower-order is moved from register L to accumulator. Its complement is found by using CMA instruction. The result obtained is moved back to register L. Then, the higher-order is moved from register H to accumulator. Its complement is found by using CMA instruction. The result obtained is moved back to register H. H-L pair is incremented to get 2’s complement. Now, the final result is in H-L pair. The result is stored from H-L pair to memory locations 3002H-3003H. 4. Required Results: Input: 8-bit number: ……… 16-bit number: ……… 13 Output: 1’s and 2’s complement of 8-bit number: ……. 1’s and 2’s complement of 16-bit number: ……. . Cautions: a. Before enter the program press RST key on 8085 kit. b. Proper care must be taken while handling the microprocessor kit. 6. Learning outcomes: Student will be able to learn how to use logical instructions. 14 Experiment 4 1. Aim: Perform the following using 8085 Simulator and 8085 Microprocessor kit in assembly language: i. Write a program to count number of 1’s in a program. . ii. Split hex data into two nibbles and swap the higher nibble and lower nibble of that number. Requirements: 8085 Microprocessor kit. 2. Learning Objective: Swapping of lower and higher nibble of a number. . Assembly language Program ( i ) : MVI B,00H MVI C,08H MOV A,D BACK: RAR JNC SKIP INR B SKIP: DCR C JNZ BACK HLT Program ( ii ) : LDA 2200H ; Get the packed BCD number ANI F0H ; Mask lower nibble RRC RRC RRC RRC ; Adjust higher BCD digit as a lower digit STA 2300H ; Store the partial result LDA 2200H ; Get the original BCD number ANI 0FH ; Mask higher nibble STA 2301H ; Store the result LDA 2300H ; Get the contents of memory location 2300H into accumulator MOV B, A ; save the contents in B register LDA 2301H ; Get the contents of memory location 2301H into accumulator.

STA 2300H ; Store the contents of accumulator at address 2000H. MOV A, B ; Get the saved contents back into A register STA 2301H ; Store the contents of accumulator at address 2200H HLT ; Terminate program execution 15 4. Required Results: Input: Enter the number: ……… Output: number of one’s in number: ……. Result after swapping: ……. 5. Cautions: a. Before enter the program press RST key on 8085 kit. b. Proper care must be taken while handling the microprocessor kit. 6. Learning outcomes: Students will be able to learn mathematical operations using 8085 kit. 16 Experiment 5 1.

Aim: Write a program to convert a 2-digit BCD number into its binary equivalent number. Requirements: 8085 Microprocessor kit. 2. Learning Objective: BCD to binary conversion of a number. 3. Program: Sample problem: (2200H) = 67H (2300H) = 6 x OAH + 7 = 3CH + 7 = 43H Sample Program: LDA 2200H : Get the BCD number MOV B, A : Save it ANI OFH : Mask most significant four bits MOV C, A : Save unpacked BCDI in C register MOV A, B : Get BCD again ANI FOH : Mask least significant four bits RRC : Convert most significant four bits into unpacked BCD2 RRC RRC RRC MOV B, A : Save unpacked BCD2 in B register XRA A : Clear accumulator (sum = 0) 7 MVI D, 0AH : Set D as a multiplier of 10 Sum: ADD D : Add 10 until (B) = 0 DCR B : Decrement BCD2 by one JNZ SUM : Is multiplication complete? i if not, go back and add again ADD C : Add BCD1 STA 2300H : Store the result HLT : Terminate program execution 4. Required Results: Input: Enter 2 digit BCD number: ……… Output: Equivalent binary number: ……. 5. Cautions: a. Before enter the program press RST key on 8085 kit. b. Proper care must be taken while handling the microprocessor kit. . Learning outcomes: Student will be able to learn the use of stack pointer and subroutines. 18 Experiment 6 1. Aim: Perform the following using 8085 Simulator and 8085 Microprocessor kit in assembly language : i. ii. Write a program for displaying BCD down counter. Counter should count numbers from 99 to 00 and it should increment after every 1 sec. Write a program for displaying binary up counter. Counter should count numbers from 00 to FFH and it should increment after every 0. sec. Requirements: 8085 Microprocessor kit. 2. Learning Objective: Implementation of BCD down counter and Binary UP counter. 3. Program ( i ) : LXI SP, 27FFH : Initialize stack pointer MVI C, 99H : Initialize counter = 99 BACK:CALL Display : Call display subroutine CALL Delay : Call delay subroutine ADI 99H : See Addition below DAA : Adjust for decimal CPI 99H : Compare with last count JNZ BACK :If no, repeat HLT 19

Program ( ii ) : 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 Routine: 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 4. Cautions: a. Before enter the program press RST key on 8085 kit. b.

Proper care must be taken while handling the microprocessor kit. 5. Learning outcomes: mathematical operations using 8085. 20 Experiment 7 1. Aim: Interfacing of Seven segment display with 8085 microprocessor. Requirements: 8085 Microprocessor kit, Seven Segment LED & wires. 2. Learning Objective: Seven segment interfacing using 8085 kit. 3. Circuit Diagram: 4. Program: MVI A, 80H OUT CR K: LXI H, 2000H MVI B, 10H KK: MOV A, M OUT PA CALL DELAY INX H JNZ KK 21 JMP K HLT Delay: LXI D, Count Back: DCX D MOV A, D ORA E JNZ Back RET 5.

Inputs: 2000: 40H, 79H, 24H, 30H, 19H, 12H, 02H, 78H, 00H, 18H, 08H, 03H, 46H, 21H, 06H, 0EH 6. Result: On the Seven segment LED we can see all the Hexadecimal no’s displayed with some delay as mentioned. 7. Cautions: a. Before enter the program press RST key on 8085 kit. b. Proper care must be taken while handling the microprocessor kit. 8. Learning outcomes: Students will be able to learn how to interface seven segment with 8085. 22 Experiment 8: 1. Aim: Interfacing of D/A converter with 8085 microprocessor to generate RAMP wave.

Requirements: 8085 Microprocessor Kit, DAC0808, 100nF(2), 1k, Op-Amp 741. 2. Learning Objective: Digital to analog converter interfacing. 3. Circuit Diagram: 4. Program: MOV A, 80H OUT CW MVI A, 00H KK: OUT PA CALL DELAY INC A JMP KK RST 5 Delay: LXI D, Count Back: DCX D MOV A, D ORA E JNZ Back RET 23 5. Result: On the CRO we can see a RAMP wave generated. 6. Cautions: a. Before enter the program press RST key on 8085 kit. b. Proper care must be taken while handling the microprocessor kit. 7. Learning outcomes: Students will be able to learn how to interface digital to analog converter with 8085. 4 Experiment 9 1. Aim: Interfacing and control of stepper motor using 8085 microprocessor. Requirements: 8085 Microprocessor kit, Stepper Motor, Motor driver circuit (ULN2003) & wires. 2. Learning Objective: Stepper motor interfacing with 8085. 3. Program: i) To rotate in Clock Wise direction MVI A, 80H OUT CR MVI A, 44H KK: OUT PA CALL DELAY RRC JMP KK RST 5 ii) To rotate in Anti-Clock Wise direction MVI A, 80H OUT CR MVI A, 44H KK: OUT PA CALL DELAY RLC JMP KK RST 5 Delay: LXI D, Count Back: DCX D MOV A, D ORA E JNZ Back RET 4.

Result: Stepper motor rotates in Clock wise & Anti-clock wise direction. 5. Cautions: a. Before enter the program press RST key on 8085 kit. b. Proper care must be taken while handling the microprocessor kit. 6. Learning outcomes: Students will be able to learn how to interface and control stepper motor with 8085. 25 Experiment 10 1. Aim: Design a 8085 Microprocessor based Traffic light control for figure shown below with the following conditions: Allow traffic to flow from N to S & S to N for 1sec Glow all Yellow lights for 0. sec Allow traffic to flow from W to E & E to W for 1sec Glow all Yellow lights for 0. 2sec Make this process continues. Requirements: 8085 Microprocessor Kit, 9 LED’s, 5K resistors (9) 2. Learning Objective: Traffic light control system using 8085. 3. Circuit Diagram: 4. Program: MVI A, 80H : Initialize 8255, port A and port B OUT CR ;(CR) : in output mode START: MVI A, 09H OUT PA; (PA) : Send data on PA to glow R1 and R2 MVI A, 24H OUT PB; (PB) : Send data on PB to glow G3 and G4 MVI C, 28H : Load multiplier count (40?? ) for delay 26

CALL DELAY : Call delay subroutine MVI A, 12H OUT PA; PA : Send data on Port A to glow Y1 and Y2 OUT 81H ;PB : Send data on port B to glow Y3 and Y4 MVI C, 0AH : Load multiplier count (10?? ) for delay CALL: DELAY : Call delay subroutine MVI A, 24H OUT 80H ;PA : Send data on port A to glow G1 and G2 MVI A, 09H OUT 81H; PB : Send data on port B to glow R3 and R4 MVI C, 28H : Load multiplier count (40?? ) for delay CALL DELAY : Call delay subroutine MVI A, 12H OUT 80H : Send data on port A to glow Y1 and Y2 OUT 81H : Send data on port B to glow Y3 and Y4 MVI C, 0AH : Load multiplier count (10?? for delay CALL DELAY : Call delay subroutine JMP START Delay Subroutine: DELAY: LXI D, Count : Load count to give 0. 5 sec delay BACK: DCX D : Decrement counter MOV A, D ORA E : Check whether count is 0 JNZ BACK : If not zero, repeat DCR C : Check if multiplier zero, otherwise repeat JNZ DELAY RET : Return to main program 5. Cautions: a. Before enter the program press RST key on 8085 kit. b. Proper care must be taken while handling the microprocessor kit. 6. Learning outcomes: Students will be able to learn how to design microprocessor based traffic light system using 8085. 27

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