Microprocessor
A microprocessor is ALU

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

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Microprocessor
The stack pointer register in a microprocessor

 keeps the address of the next instruction to be fetched
 holds the address of the top of the stack
 counts the number of programs being executing on the microprocessor
 counts the number of instructions being executing on the microprocessor

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