Microprocessor
Program counter in a digital computer

 Counts the numbers of programs run in the machine.
 Counts the number of times the loops are executed.
 Points the memory address of the next instruction to be fetched.
 Counts the number of times a subroutine is called.

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

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

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