8051-MCQ

8051 microcontrollers are manufactured by which of the following companies?

• Atmel

• Philips

• Intel

• All of the mentioned

8051 series has how many 16 bit registers?

• 2

• 1

• 0

• 3

When the microcontroller executes some arithmetic operations, then the flag bits of which register are affected?

• PSW

• SP

• DPTR

• PC

How are the bits of the register PSW affected if we select Bank2 of 8051?

• PSW.5=0 and PSW.4=1

• PSW.2=0 and PSW.3=1

• PSW.3=1 and PSW.4=1

• PSW.3=0 and PSW.4=1

If we push data onto the stack then the stack pointer

• increases with every push

• decreases with every push

• increases & decreases with every push

• none of the mentioned

On power up, the 8051 uses which RAM locations for register R0- R7

• 00-2F

• 00-07

• 00-7F

• 00-0F

Which of the ports act as the 16 bit address lines for transferring data through it?

• PORT 0 and PORT 1

• PORT 1 and PORT 2

• PORT 0 and PORT 2

• PORT 1 and PORT 3

Which addressing mode is used in pushing or popping any element on or from the stack?

• Immediate

• direct

• indirect

• register

Which operator is the most important while assigning any instruction as register indirect instruction?

• #

• @

• *

• &

Which of the following comes under the indexed addressing mode?

• MOVX A, @DPTR

• MOVC @A+DPTR,A

• MOV A,R0

• MOV @R0,A