Microprocessor
The stack pointer register in a microprocessor

 keeps the address of the next instruction to be fetched
 counts the number of instructions being executing on the microprocessor
 counts the number of programs being executing on the microprocessor
 holds the address of the top of the stack

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Microprocessor
Assertion(A): Ready signal of microprocessor is used to detect whether a peripheral is ready for the data transfer or not. Reason(R): In the microprocessor during data transfer operations, the wait states are added by forcing the ready signal low.

 Both A & R are true but R is not the correct explanation of A .
 A is true but R is false.
 Both A & R are true and R is the correct explanation of A.
 A is false but R is true.

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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 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.
 Indicates that another master is requesting the use of the address and data buses.

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