Microprocessor
At the beginning of a fetch cycle, the contents of the program counter are

 transferred to memory data register.
 transferred to address bus.
 transferred to memory address register .
 incremented by one.

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Microprocessor
The output data lines of microprocessor and memories are usually tristated because

 It increases the speed of data transfer over the data bus
 The data line can be multiplexed for both input and output
 More than one device can transmit over the data bus at the same time
 More than one device can transmit information over the data bus by enabling only one device at a time

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