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

 Machine cycle
 Memory cycle
 Instruction cycle
 Clock cycle

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Microprocessor
HLDA signal in 8085 performs the following operation:

 Indicates that another master is requesting the use of the address and data buses.
 Indicates that the CPU has not received the HOLD request.
 Indicates that the CPU has received the HOLD request and that it will relinquish the bus in the next clock cycle.
 Hold the data in the accumulator until the microprocessor is turned OFF.

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Microprocessor
Assertion(A): Monostablemultivibrators (IC74121) are used in a microprocessor based system for frequency measurement. Reason(R): Microprocessor counts the number of interrupt signals/second or within a specified interval through ISR.

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

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