MICROPROCESSOR QUIZ

While using a frequency counter for measuring frequency, two modes of measurement are possible: Period time Frequency mode There is a ‘cross-over frequency’ below which the period mode is preferred. Assuming the crystal oscillator frequency to be 4MHz, the crossover frequency is given by

2 Mhz.

8 Mhz.

2 Khz.

1Khz.

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The multiplexing of address bus and data buses is used in

all the microprocessors.

depends on the internal architecture.

never multiplexed.

none of these.

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Of the following circuits, the one which involves storage is

Decoder

Mux

Nand

RS Latch

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Internet is a worldwide network of computers where most of the information is freely available.

True

False

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While STC instruction executes,

only carry and zero flags will be affected.

all flags will be affected.

only carry flag will be affected.

no flags will be affected.

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After RESET 8255 will be in

mode 2

unchanged condition

mode 0; all ports are output

mode 0; all ports are input

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In 8085 microprocessor based system maximum possible number of input/output devices can be connected using I/O mapped I/O technique is

64

65536

512

256

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SUB A instruction in 8085

reset zero and parity flags

sets zero and carry flags

reset carry and sign flags

sets zero and sign flags

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Both the ALU and control section of CPU employ which special purpose storage location?

Decoders

Accumulators

Buffers

Registers

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If the number of address bits in a memory is reduced by 2 and the addressability is doubled, the size of the memory (i.e., the number of bits stored in the memory)

Increases by 2^(address bits)/addressability

Remains unchanged

Halves

Doubles

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