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Microprocessor

Microprocessor
How many T-states are required for execution of OUT 80H instruction?

 16
 7
 10
 13

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Microprocessor
Let the content of accumulator and register B be 0000 0100 and 0100 0000 respectively before execution of instruction SUB B. The content of accumulator after the execution of this instruction will be

 00000100
 010001000
 11000100
 01000000

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Microprocessor
The cycle required to fetch and execute an instruction in a 8085 microprocessor is which one of the following?

 Clock cycle
 Memory cycle
 Machine cycle
 Instruction cycle

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Microprocessor
How many bytes in a zero memory page should be reserved for vectors used by RST instructions?

 128.
 32.
 64.
 16.

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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.
 8 Mhz.
 2 Mhz.

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Microprocessor
In an 8085 microprocessor based system, the contents of SP are 1000H, PUSH B instruction will transfer the contents of registers B & C respectively for memory locations

 1000 H and 1001 H
 0FFF H and 0FFE H
 0FFE H and 0FFF H
 1000 H and 0FFF H

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