Microprocessor
When referring to instruction words, a mnemonic is

 a short abbreviation for the data word stored at the operand address.
 shorthand for machine language.
 a short abbreviation for the operation to be performed.
 a short abbreviation for the operand address.

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Microprocessor
Program counter in a digital computer

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

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