Explain the following instructions. SWAP A ADD C MUL AB CJNE A, add, radd MOV A, R0 MOVX A, @ A + DPTR.

Explain the following instructions.

SWAP A

ADD C

MUL AB

CJNE A, add, radd

MOV A, R0

MOVX A, @ A + DPTR.
by

1 Answer

Answer :

SWAP A

Description: This instruction exchanges bits 0-3 of the Accumulator with bits 4-7 of the

Accumulator. This instruction is identical to executing "RR A" or "RL A four times

Example: MOV A, #59H ; A= 59H

 SWAP A ; A= 95H

ADD C

Description: This instruction is used to perform addition of two eight-bit numbers along with

carry. The result is stored in accumulator which is the default destination.

Example: ADDC A, R0 : Add contents of accumulator, R0 and carry .The result is stored in

accumulator.

MUL AB

Description: the multiplicand and the multiplier must be in A and B registers. After

multiplication if the result is 8 bit it will be in the accumulator and if the result is larger than

8 bit ,lower byte of result will be in accumulator and higher byte will be in register B.

Example :MOV A,#10H

 MOV B,#02 H

 MUL AB

After execution A=20H,B=0 H

CJNE A, add, radd

Description: Compare the contents of the accumulator with the 8 bit data in memory

address mentioned in the instruction and if they are not equal then jump to the relative

address mentioned in the instruction.

Example: CJNE A, 04H, UP: Compare the contents of the accumulator with the contents of

04H memory and if they are not equal then jump to the line of instruction where UP label is

mention

MOV A,R0

Description: this instruction copies the contents of source register R0 into accumulator. The

register R0 remains unaffected.

Example: Before Execution A=43 H, R0=32 H

 After execution A=32 H, R0-32H

MOVX A, @ A + DPTR. (Consider it as MOVC A,@A+DPTR)

Description: Copy the contents of code memory pointed by the sum of Accumulator and

DPTR to the Accumulator

MOVC is a move instruction, which moves data from the code memory space. The

address operand in this example is formed by adding the content of the DPTR register to

the accumulator value. Here the DPTR value is referred to as the base address and the

accumulator value is referred to as the index address.

by

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