![]() The Input and output unit interfaces the I/O peripheral devices to the microprocessor for accepting and sending information. ![]() The Memory unit holds the program as well as data and is divided into a processor, primary and secondary memory. The ALU computes all arithmetic as well as logic operations on data and specifies the size of microprocessors like 16 bit or 32 bit. A microprocessor consists of general-purpose and a special type of registers to execute instructions and to store the address or data while running the program. Based on the registers also the generations of the microprocessor can be classified. The Central processing unit consists of one or more arithmetic logic unit (ALU), registers, and control unit. It further consists of data, address, and control buses to perform data exchanging properly. The system bus connects the various units to facilitate the exchange of information.
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