Microprocessor
A microprocessor is ALU

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

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Microprocessor
Ready pin of microprocessor is used

 to indicate that microprocessor is ready to receive outputs
 to introduce wait state
 to indicate that microprocessor is ready to receive inputs
 to provide direct memory access

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