MICROCONTROLLER

A microcontroller at-least should consist of:

• RAM, ROM, I/O devices, serial and parallel ports and timers

• CPU, RAM, I/O devices, serial and parallel ports and timers

• CPU, RAM, ROM, I/O devices, serial and parallel ports and timers

• CPU, ROM, I/O devices and timers

What is the size internal ROM memory of 8051 Microcontroller?

• 128 bits

• 128 Bytes

• 4K bits

• 4K bytes

The contents of SP register after RESET?

• 06H

• 00H

• 0AH

• 07H

How many 16 bit registers present in 8051 microcontroller?

• 1

• 2

• 3

• 4

Which of the following is true, if the contents of PSW is 16H?

• Program uses registers from bank3

• Carry flag set to 1

• program uses registers from bank2

• Program uses registers from bank0

When PUSH instruction is executed.

• The SP is incremented by one

• The SP is incremented by two

• The SP is decremented by one

• The SP is decremented by two

Numbers pins present in 8051 Microcontroller?

• 20

• 30

• 40

• 80

An alternate function of port pin P3.0 in the 8051 is:

• Timer 0 external input

• Serial input port

• External data memory write strobe

• External data memory read strobe