Microprocessor
The microprocessor may be made to exit from HALT state by asserting

 RESTART
 READY line
 any of the five interrupt lines
 A or B or HOLD line

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Microprocessor
Assertion(A): The frequency of 8085 system is ½ of the crystal frequency. Reason(R): Microprocessor (8085) requires a two phase clock.

 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
 A is true but R is false

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Microprocessor
HLDA signal in 8085 performs the following operation:

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

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