Microprocessor

Question 51

The TRAP is one of the interrupts available in INTEL 8085. Which one of the following statements is true of TRAP ?

• it is level triggered
• it is negative edge triggered
• it is +ve edge triggered
• it is both +ve and -ve edges triggered

Question 52

For the 8 - bit word 00111001, the check bits stored with it would be 0111. Suppose when the word is read from memory, the check bits are calculated to be 1101. What is the data word that was read from memory?

• 10011001
• 00011001
• 00111000
• 11000110

Question 53

Consider a 32 - bit microprocessor, with a 16 - bit external data bus, driven by an 8 MHz input clock. Assume that this microprocessor has a bus cycle whose minimum duration equals four input clock cycles. What is the maximum data transfer rate for this microprocessor?

• 8 x 10⁶ bytes/sec

• 4 x 10⁶ bytes/sec

• 16 x 10⁶ bytes/sec

• 4 x 10⁹ bytes/sec

Question 54

The RST 7 instruction in 8085 microprocessor is equivalent to:

• CALL 0010 H
• CALL 0034 H
• CALL 0038 H
• CALL 003C H

Question 55

Match the following:

List - I	List - II
(a)XCHG	(i)only carry flag is affected.
(b)SUB	(ii) no flags are affected.
(c)STC	(iii) all flags other than carry flag are affected.
(d)DCR	(iv)all flags are affected.

codes:

	(a)	(b)	(c)	(d)
(1)	(iv)	(i)	(iii)	(ii)
(B)	(iii)	(ii)	(i)	(iv)
(C)	(ii)	(iii)	(i)	(iv)
(D)	(ii)	(iv)	(i)	(iii)

• (A)
• (B)
• (C)
• (D)

Question 56

How many times will the following loop be executed?  LXI B, 0007 H LOP : DCX B   MOV A, B   ORA C   JNZ LOP

• 05
• 07
• 09
• 00

Question 57

Specify the contents of the accumulator and the status of the S, Z and CY flags when 8085 microprocessor performs addition of 87 H and 79 H.

• 11, 1, 1, 1
• 10, 0, 1, 0
• 1, 1, 0, 0
• 00, 0, 1, 1