8051 Instruction Set

What are the different addressing modes supported by the 8051 microcontroller?

• Immediate Indirect

• Absolute

• Immediate, Direct, Indirect, Register, Register Indirect, Indexed, Relative

• Direct Indexed

• Stack

Explain the MOV instruction in the 8051 instruction set.

• The MOV instruction is used for arithmetic operations in 8051

• MOV stands for Memory Overflow in 8051

• MOV instruction is used for branching in 8051

• The MOV instruction in the 8051 instruction set is used for data transfer operations.

How does the ADD instruction work in the 8051 microcontroller?

• The ADD instruction in the 8051 microcontroller subtracts the operand value from the accumulator.

• The ADD instruction in the 8051 microcontroller performs addition between the accumulator (A) and a specified operand. It adds the operand value to the accumulator and stores the result back in the accumulator.

• The ADD instruction in the 8051 microcontroller multiplies the accumulator by the specified operand.

• The ADD instruction in the 8051 microcontroller compares the accumulator with the specified operand.

What is the purpose of the ANL instruction in the 8051 instruction set?

• ANL stands for 'Add and Load' in the 8051 instruction set.

• ANL instruction is used to perform a logical OR operation in the 8051 instruction set.

• The ANL instruction in the 8051 instruction set is used for division operations.

• The purpose of the ANL instruction in the 8051 instruction set is to perform a bitwise AND operation between the accumulator and a data byte.

Describe the function of the CJNE instruction in the 8051 microcontroller.

• The CJNE instruction in the 8051 microcontroller is used to multiply two operands.

• The CJNE instruction in the 8051 microcontroller is used to compare two operands and conditionally jump to a specified address if they are not equal.

• The CJNE instruction in the 8051 microcontroller is used to load a value into a register.

• The CJNE instruction in the 8051 microcontroller is used to divide two operands.

What are the logical instructions available in the 8051 instruction set?

• ADD

• MOV

• SUB

• AND, OR, XOR, NOT, SETB, CLR

Explain the function of the INC instruction in the 8051 microcontroller.

• It multiplies the value by 2.

• It decrements the value by 1.

• It increments the value by 1.

• It resets the value to 0.

How does the SUBB instruction differ from the SUB instruction in the 8051 microcontroller?

• SUBB instruction performs subtraction with borrow, SUB instruction performs subtraction without borrow.

• SUBB instruction performs subtraction with carry, SUB instruction performs subtraction without carry.

• SUBB instruction performs subtraction without borrow, SUB instruction performs subtraction with borrow.

• SUBB instruction performs addition with borrow, SUB instruction performs subtraction without borrow.

What is the role of the XRL instruction in the 8051 instruction set?

• Increments the value of the accumulator by 1.

• Performs a bitwise XOR operation between the accumulator and a specified register, storing the result in the accumulator.

• Performs a division operation between two specified registers.

• Stores the result of a logical AND operation between the accumulator and a specified register.

Describe the function of the RLC instruction in the 8051 microcontroller.

• The RLC instruction in the 8051 microcontroller shifts the accumulator contents to the right

• RLC stands for Read Load Compare in the 8051 microcontroller

• RLC instruction in the 8051 microcontroller resets the accumulator to zero

• The RLC instruction in the 8051 microcontroller rotates the bits of the accumulator to the left by one position.