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Microprocessor

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

 128.
 16.
 32.
 64.

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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

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

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Microprocessor
Which of the following is not treated as hexadecimal constant by assembler in 8085?

64 H
234
45 H
6 AFH

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

 ANI F0H
 XRI FOH
 XRI 0FH
 ANI OFH

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Microprocessor
Inintel 8085A microprocessor ALE signal is made high to

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

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

 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
 A is true but R is false
 A is false but R is true

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