Microprocessor
While STC instruction executes,

 no flags will be affected.
 only carry and zero flags will be affected.
 only carry flag will be affected.
 all flags will be affected.

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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
 The data line can be multiplexed for both input and output
 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

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Microprocessor
Program counter in a digital computer

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

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