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

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Microprocessor
Cycle stealing mode of DMA operation involves

 While the microprocessor is executing a program an interface circuit takes over control of address, data, control buses when not in use by microprocessor
 The DMA control waiting for the microprocessor to finish execution of the program and then takes over the buses
 DMA controller taking over the address, data and control buses while a block of data is transferred between memory and I/O device
 Data transfer takes place between the I/O device and memory during every alternate clock cycle

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Microprocessor
The interrupt facility is provided in microprocessor to

 keep a control on the working of the microprocessor
 stop the microprocessor when it starts malfunctioning
 change the sequence of the instructions being executed
 stop the microprocessor when desired

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