8051 Microcontroller Instruction Set Quiz

What does the MOV instruction do?

• Adds two operands

• Copies data from source to destination

• Copies data from destination to source

• Subtracts one operand from another

What is the purpose of the PUSH instruction?

• To copy data from the stack to a register

• To copy data from a register to the stack

• To decrement the stack pointer

• To increment the stack pointer

Which instruction is used to multiply two unsigned numbers?

• ADD A, source

• MUL AB

• SUB A, source

• DIV AB

What does the DJNZ instruction do?

• Increments a byte without jumping

• Decrements a byte without jumping

• Increments a byte and jumps if zero

• Decrements a byte and jumps if not zero

Which instruction is invalid for pushing onto the stack?

• PUSH R0

• PUSH 05H

• PUSH A

• PUSH 0E0H

What is the result of the DIV AB instruction?

• Both A and B contain the remainder

• A contains the remainder, B contains the quotient

• A contains the quotient, B contains the remainder

• Both A and B contain the quotient

What does the SWAP instruction do?

• Swaps two registers

• Swaps the contents of the accumulator with a register

• Swaps the contents of two memory locations

• Swaps the high and low nibbles of a byte

Which instruction is used for logical AND operation?

• OR A, B

• AND A, B

• XOR A, B

• NOT A

What does the INC DPTR instruction do?

• Increments the data pointer

• Resets the data pointer

• Copies data to the data pointer

• Decrements the data pointer

What is the purpose of the DA instruction?

• Data alignment adjustment

• Direct address adjustment

• Data adjust for binary addition

• Decimal adjust for BCD addition