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259.

Consider the sequence of 8085 instructions given below.
LXI H, 9258
MOV A, M,
CMA,
MOV M, A
Which one of the following is performed by this sequence? [2 marks]
(a) contents of location 9258 are moved to the accumulator
(b) contents of location 9258 are compared with the contents of the accumulator
(c) contents of location 8529 are complemented and stored in location 8529
(d) contents of location 5892 are complemented and stored in location 5892

asked in Electronics and Communication Engineering, 2004

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260.

In the modulo-6 ripple counter shown in Figure, the output of the 2-input gate is used to clear the J-K flip-flops.

The 2-input gate is: [2 marks]
(a) a NAND gate
(b) a NOR gate
(c) an OR gate
(d) an AND gate

asked in Electronics and Communication Engineering, 2004

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261.

The number of memory cycles required to execute the following 8085 instructions
I. LDA 3000H
II. LXI D, FOF 1H
Would be [2 marks]
(a) 2 for I and 2 for II
(b) 4 for I and 3 for II
(c) 3 for I and 3 for II
(d) 3 for I and 4 for II

asked in Electronics and Communication Engineering, 2004

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262.

The 8255 Programmable Peripheral Interface is used as described below.
I. An A/D converter is interfaced to a microprocessor through an 8255. the conversion is initiated by a signal from the 8255 on Port C. A signal on Port C causes data to be strobed into Port A.
II. Two computers exchange data using a pair of 8255s. Port A works as a bidirectional data port supported by appropriate handshaking signals.
The appropriate modes of operation of the 8255 for I and II would be
[2 marks]
(a) Mode 0 for I and Mode 1 for II
(b) Mode 1 for I and Mode 0 for II
(c) Mode 2 for I and Mode 0 for II
(d) Mode 2 for I and Mode 1 for II

asked in Electronics and Communication Engineering, 2004

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263.

11001, 1001 and 111001 correspond to the 2’s complement representation of which one of the following sets of number? [2 marks]
(a) 25, 9 and 57 respectively
(b) -6, -6 and –6 respectively
(c) -7, -7 and –7 respectively
(d) -25, -9 and –57 respectively

asked in Electronics and Communication Engineering, 2004

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264.

The Boolean expression AC + BC is equivalent to [2 marks]
(a) A C + BC + AC
(b) B C + AC + BC + A CB
(c) AC + BC + B C + ABC
(d) ABC + A BC + ABC + ABC

asked in Electronics and Communication Engineering, 2004

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