Microprocessor

Question 11

Horizontal microprogramming :

• does not require use of signal decoders
• results in larger sized microinstructions than vertical microprogramming
• uses one bit for each control signal
• all of the above.

Question 12

A low memory can be connected to 8085 by using

• INTER
• RESET IN
• HOLD
• READY

Question 13

Suppose a processor does not have any stack pointer register. Which of the following statements is true?

• It cannot have subroutine call instruction
• It can have subroutine call instruction, but no nested subroutine calls
• Nested subroutine calls are possible, but interrupts are not
• All sequences of subroutine calls and also interrupts are possible

Question 14

A processor needs software interrupt to

• test the interrupt system of the processor
• implement co-routines
• obtain system services which need execution of privileged instructions
• return from subroutine

Question 15

A CPU has two modes-privileged and non-privileged. In order to change the mode from privileged to non-privileged

• a hardware interrupt is needed
• a software interrupt is needed
• a privileged instruction (which does not generate an interrupt) is needed
• a non-privileged instruction (which does not generate an interrupt is needed

Question 16

Which is the most appropriate match for the items in the first column with the items in the second column

X. Indirect Addressing        I. Array implementation
Y. Indexed Addressing         II. Writing re-locatable code
Z. Base Register Addressing   III. Passing array as parameter

• (X, III) (Y, I) (Z, II)
• (X, II) (Y, III) (Z, I)
• (X, III) (Y, II) (Z, I)
• (X, I) (Y, III) (Z, II)

Question 17

To put the 8085 microprocessor in the wait state

• lower the-HOLD input
• lower the READY input
• raise the HOLD input
• raise the READY input

Question 18

The 8085 microprocessor responds to the presence of an interrupt

• As soon as the TRAP pin becomes \'high\'
• By checking the TRAP pin for \'high\' status at the end of each instruction fetch
• By checking the TRAP pin for \'high\' status at the end of the execution of each instruction
• By Checking the TRAP pin for \'high\' status at regular intervals

Question 19

Answer the following: a. Draw the schematic of an 8085 based system that can be used to measure the width of a pulse. Assume that the pulse is given as a TTL compatible signal by the source which generates it. b.  Write the 8085 Assembly Language program to measure the width of the pulse. State all your assumption clearly.

Question 20

In 8085 microprocessor which of the following flag(s) is (are) affected by an arithmetic operation ?

• AC flag Only
• CY flag Only
• Z flag Only
• AC, CY, Z flags