Arithmetic operations in 8051

What does the ADD A, operand instruction do in the 8051 microcontroller?

• Adds the contents of the accumulator and operand and stores the result in the accumulator.

• Adds the operand to the accumulator and stores the result in the operand.

• Adds the contents of the accumulator to the operand and stores the result in the operand.

• None of these

Which instruction is used for subtracting the contents of a register R4 from the accumulator in the 8051 microcontroller?

• SUBB A, R4

• SUB A, operand

• SUB A,R4

• SUBB R4,A

What is the purpose of the INC operand instruction in the 8051 microcontroller?

• Increments the accumulator by the value of the operand.

• Increments the operand by 1.

• Increments the value at the memory location specified by the operand.

• Increments the program counter by the value of the operand.

Which of the following instructions is used for multiplying in the 8051 microcontroller?

• MUL AB

• MUL A,#data

• MUL A,B

• MUL A,address

What is the purpose of the CPL A instruction in the 8051 microcontroller?

• Copies the value of register A to the carry flag.

• Complements (flips) all the bits in the accumulator.

• Clears the carry flag.

• Copies the carry flag to register A.

Which instruction is used to perform a bitwise AND operation between the accumulator and the operand in the 8051 microcontroller?

• ORL A, operand

• AND A, operand

• XRL A, operand

• ANL A, operand

What is the status of the Carry flag when subtraction results in a negative number?

• C = 1

• C = 0

• Carry bit is not affected

• Can't say anything

Which instruction is used for clearing the accumulator

• CLR A

• MOV A,#00

• CPL A

• None of them

In multiplication of 2 bytes in 8051, we must place one byte in ______ and other byte in _________

The C & AC flag for the following instructions are,

MOV A,#3FH

ADD A,#45H