Microcontroller Quiz

How many ports are there in 8051?

• 2

• 4

• 6

• 8

What is the size of the accumulator in 8051?

• 8 bits

• 16 bits

• 32 bits

• 64 bits

Which pins are used as the data bus in 8051?

• P0.0-P0.7

• P1.0-P1.7

• P2.0-P2.7

• P3.0-P3.7

Which pin is used as the transmit data in 8051?

• TXD

• RXD

• P3.0

• P3.1

What is the primary function of the ALU in 8051?

• To perform arithmetic operations

• To perform logical operations

• To perform both arithmetic and logical operations

• To store data

Which logical operation can be performed by the ALU in 8051 using the ANL instruction?

• AND

• OR

• XOR

• NOT

What is the purpose of the carry flag (CY) in the ALU of 8051?

• To store the result of an arithmetic operation

• To store the result of a logical operation

• To indicate a carry or borrow in an arithmetic operation

• To indicate an overflow in an arithmetic operation

What is the primary function of the Program Counter (PC) in 8051?

• To store data

• To store instructions

• To keep track of the current program address

• To perform arithmetic operations

How does the Program Counter (PC) increment in 8051?

• Automatically after each instruction

• Manually by the programmer

• Only during a jump instruction

• Only during a call instruction

What is the function of the pull-up resistors in the I/O ports of 8051?

• To pull the input signals high

• To pull the output signals low

• To reduce the power consumption

• To increase the speed of operation