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Microprocessor

Microprocessor
How many machine cycles are required for execution of IN 30H instruction

 4
 3
 6
 5

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Microprocessor
S0 and S1 pins are used for

None of these
 serial communication
 indicating the processor’s status
 acknowledging the interrupt

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Microprocessor
The character set of Fortran 77 includes lower case alphabets a to z.

True
False

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Microprocessor
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.
 1Khz.
 2 Khz.
 8 Mhz.

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Microprocessor
Assertion(A): Address bus is unidirectional. Reason(R): Data bus is bidirectional

 A is false but R is true
 A is true but R is false
 Both A & R are true and R is the correct explanation of A
 Both A & R are true but R is not the correct explanation of A

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Microprocessor
In microprocessor based system I/O ports are used to interface

 all the I/O devices
 the I/O devices and memory chips
 the I/P device only
 the O/P devices only

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