Microprocessor
A microprocessor is ALU

 register unit and control unit on a single chip.
 and control unit on a single chip.
 register unit and I/O device on a single chip.
 and memory on a single chip.

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Microprocessor
Program counter in a digital computer

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

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