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 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
Which of the following is not true during the execution of an interrupt service routine, which does not contain any EI instructions

 the microprocessor cannot be interrupted by any interrupt
 the microprocessor cannot be interrupted by any mask able interrupt
 the microprocessor can be interrupted by a non-mask able interrupt
 all interrupts except non-maskable interrupt are disabled

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