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Microprocessor

Microprocessor
SPHL instruction copies the content of H-L register pair to the _________.

 B-C
 Stack Pointer
 D-E
 PSW

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Microprocessor
Which of the following conditions is not allowed in an RS latch?

R is asserted, S is asserted
R is asserted, S is negated
R is negated, S is asserted
R is negated, S is negated

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Microprocessor
A combinational PLD with a programmable AND array and a fixed OR array is called a

 PAL
 PROM
 PLD
 PLA

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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.
 2 Mhz.
 1Khz.
 8 Mhz.

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Microprocessor
The data bus of any microprocessor is always

 Unidirectional
 Bi-directional
 Either unidirectional or bi-directional
 None

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Microprocessor
A sequence of two registers that multiplies the content of DE register pair by two and stores the result in HL register pair (in 8085 assembly language) is

 XCHG & DAD B
 XTHL & DAD H
 XCHG & DAD H
 PCHL & DAD D

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