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Microprocessor

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

 3
 5
 4
 6

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Microprocessor
Which of the following instruction will never affect the zero flag?

 DCR R
 ORA R
 DCX Rp
 XRA R

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Microprocessor
What is SIM?

 None of these.
 Sorting interrupt mask.
 Select interrupt mask.
  Set interrupt mask.

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Microprocessor
The stack pointer

 may be in RAM or ROM
 resides in RAM
 resides in microprocessor
 resides in ROM

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Microprocessor
Inintel 8085A microprocessor ALE signal is made high to

 To latch data D0-D7 from data bus
 Enable the data bus to be used as low order address bus
 To achieve all the functions listed above
 To disable data bus

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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
 01000000
 010001000
 11000100

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