Microprocessor

Question 21

In 8085 microprocessor the address bus is of __________ bits.

• 4
• 8
• 16
• 32

Question 22

In the architecture of 8085 microprocessor match the following:

• (1)
• (2)
• (3)
• (4)

Question 23

The contents of Register (BL) and Register (AL) of 8085 microprocessor are 49H and 3AH respectively. The contents of AL, the status of carry flag (CF) and sign flag (SF) after executing ‘SUB AL, BL’ assembly language instruction, are

• AL = 0FH; CF = 1; SF = 1
• AL = F0H; CF = 0; SF = 0
• AL = F1H; CF = 1; SF = 1
• AL = 1FH; CF = 1; SF = 1

Question 24

The general configuration of the micro-programmed control unit is given below: What are blocks B and C in the diagram respectively?

• Block address register and cache memory
• Control address register and control memory
• Branch register and cache memory
• Control address register and random access memory

Question 25

In 8085 microprocessor, the digit 5 indicates that the microprocessor needs:

• –5 volts, +5 volts supply
• +5 volts supply only
• –5 volts supply only
• 5 MHz clock

Question 26

In 8085, which of the following performs : load register pair immediate operation?

• LDAX rp
• LHLD addr
• LXI rp, data
• INX rp

Question 27

Which of the following statement(s) is/are correct ?

• Persistence is the term used to describe the duration of phosphorescence.
• The control electrode is used to turn the electron beam on and off.
• The electron gun creates a source of electrons which are focussed into a narrow beam directed at the face of CRT.
• All of the above

Question 28

The content of the accumulator after the execution of the following 8085 assembly language program, is MVI A, 35H MOV B, A STC CMC RAR XRA B

• 00H
• 35H
• EFH
• 2FH

Question 29

8085 microprocessor has ____ bit ALU.

• 32
• 16
• 8
• 4

Question 30

Which of the following in 8085 microprocessor performs HL = HL + HL?

• DAD D
• DAD H
• DAD B
• DAD SP