Microprocessor
Cycle stealing mode of DMA operation involves

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

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Microprocessor
The interrupt facility is provided in microprocessor to

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

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