Microprocessor
DS directive in 8085

None of these
Forces the assembler to reserve a specified number of bytes in the memory
Forces the assembler to reserve one byte of memory
Forces the assembler to reserve a specified number of consecutive bytes in the memory

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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.

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

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