8085 programs, two 8 bit number addition, subtraction, multiplication & division.

                  

                                  8085 MICRO PROCESSOR  PROGRAM

Addition of two 8 bit number:-   explanation of some      important instructions which are  used in 8 bit addition  program.

• MVI  Rd , data = move immediate 8 bit data in destination  register or memory.

                                          MVI  D , 08

• MOV Rd , Rs = This instruction copies the contents of the  source register into the destination register.

                                MOV  B, C        

• LDA    =  The contents of a memory location, specified by  a 16 bit address in the operand, are copied to the accumulator.

                               1. LDA 2001

• STA  =  The contents of accumulator are copied into the memory location specified by the operand.

                     1. STA 2002

• ADD  =  The contents of register or memory are added to the contents of accumulator. result is stored in the accumulator.

• INR =   The contents of register or memory location are incremented by 1. result is stored in the same place.

• JNC =     Jump on no carry. 

• JNZ =     jump if not zero.

• LXI =     load register pair with address of memory location.

• HLT =     terminate the program.

      

                 Execution of  8 bit addition program

 MVI C, 00             Initialize C register to 00

 LDA 4150              Load the value to Accumulator.

MOV B, A              Move the content of Accumulator to B register.

LDA 4151               Load the value to Accumulator.

ADD B                  Add the value of register B to A

JNC LOOP            Jump on no carry.

INR C                     Increment value of register C

LOOP: STA 4152  Store the value of Accumulator (sum)

MOV A, C             Move content of register C to Acc.

STA 4153             Store the value of Accumulator (carry)

HLT                  Halt the program.

             SUBTRACTION OF TWO 8 BIT NUMBER

1. Any 8-bit number, or the contents of register, or the

   contents of memory location can be subtracted from

   the contents of accumulator. The result is stored in the accumulator.

2. Subtraction is performed in 2’s complement form.

3. If the result is negative, it is stored in 2’s complement form.

4. No two other 8-bit registers can be subtracted directly.

EXECUTION OF PROGRAM:- 

MVI C, 00            Initialize C to 00

LDA 4150            Load the value to Acc.

MOV B, A            Move the content of Acc to B register.

LDA 4151            Load the value to Acc.

SUB B

JNC LOOP          Jump on no carry.

CMA                    Complement Accumulator contents.

INR A                   Increment value in Accumulator.

INR C                   Increment value in register C

LOOP: STA 4152 Store the value of A-reg to memory address.

MOV A, C             Move contents of register C to Accumulator.

STA 4153               Store the value of Accumulator memory address.

HLT                       Terminate the program.

              OBSERVATION:

              Input: 06 (4150)

                         02 (4251)

            Output: 04 (4152)

                          01 (4153)

RESULT:

Thus the program to subtract two 8-bit numbers was executed.

                Multiplication of two 8 bit number

AIM:

To perform the multiplication of two 8 bit numbers using 8085.

ALGORITHM:

1) Start the program by loading HL register pair with address of memory location.

2) Move the data to a register (B register).

3) Get the second data and load into Accumulator.

4) Add the two register contents.

5) Check for carry.

6) Increment the value of carry.

7) Check whether repeated addition is over and store the value of product and carry

in memory location.

8) Terminate the program.

PROGRAM:

MVI D, 00           Initialize register D to 00

MVI A, 00          Initialize Accumulator content to 00

LXI H, 4150

MOV B, M          Get the first number in B – reg

INX H

MOV C, M          Get the second number in C- reg.

LOOP: ADD B   Add content of A - reg to register B.

JNC NEXT         Jump on no carry to NEXT.

INR D                Increment content of register D

NEXT: DCR C  Decrement content of register C.

JNZ LOOP        Jump on no zero to address

STA 4152           Store the result in Memory

MOV A, D

STA 4153           Store the MSB of result in Memory

HLT                  Terminate the program.

OBSERVATION:

Input: FF (4150)

FF (4151)

Output: 01 (4152)

FE (4153)

RESULT:

Thus the program to multiply two 8-bit numbers was executed.

                  Division of two 8 bit numbers

AIM:

To perform the division of two 8 bit numbers using 8085.

ALGORITHM:

1) Start the program by loading HL register pair with address of memory location.

2) Move the data to a register(B register).

3) Get the second data and load into Accumulator.

4) Compare the two numbers to check for carry.

5) Subtract the two numbers.

6) Increment the value of carry .

7) Check whether repeated subtraction is over and store the value of product and

carry in memory location.

8) Terminate the program.

PROGRAM:

LXI H, 4150

MOV B,               M Get the dividend in B – reg.

MVI C, 00           Clear C – reg for quotient

INX H

MOV A, M          Get the divisor in A – reg.

NEXT: CMP B    Compare A - reg with register B.

JC LOOP             Jump on carry to LOOP

SUB B                 Subtract A – reg from B- reg.

INR C                 Increment content of register C.

JMP NEXT         Jump to NEXT

LOOP: STA 4152    Store the remainder in Memory

MOV A, C

STA 4153           Store the quotient in memory

HLT                    Terminate the program. 

2nd method of division:-

 LDA   0000
MOV B, A
LDA   0001
MVI  D, 00
BACK :SUB B
INC  D
JNC , BACK
STA    0002
MOV D, A
STA    0003 
HLT




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