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Microprocessor

Microprocessor
A single instruction to clear the lower nibble of accumulator in 8085 language assembly is

 ANI F0H
 ANI OFH
 XRI FOH
 XRI 0FH

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Microprocessor
The number of output pins in 8085 microprocessors are

 19.
 21.
 40.
 27.

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Microprocessor
After RESET 8255 will be in

 mode 0; all ports are output
 unchanged condition
 mode 2
 mode 0; all ports are input

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Microprocessor
In 8085 microprocessor, the RST6 instruction transfer programme execution to following location

 0024H.
 0030H.
 0048H.
 0060H.

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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 Khz.
 1Khz.
 2 Mhz.
 8 Mhz.

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Microprocessor
In 8086, _______ uses a mechanism known as an instruction stream queue to implement a pipeline architecture.

 Execution Unit (EU)
 Bus Interface Unit (BIU)
 None of these
 Both ‘b’ and ‘c’

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