Q12 — Computer Systems

Q12

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Which of the microprocessor components shown fetches and decodes incoming instructions?

A block diagram illustrating the internal architecture of a central processing unit C P U). The C P U, enclosed in a dashed box, interacts with input devices via a data bus, memory via a data bus, and output devices via a data bus. An external clock provides timing signals to the control unit. The control unit fetches instructions from the microprogram storage via an instruction register, which receives instructions from memory via data buffers. The control unit also generates control signals sent via the control bus. The C P U contains an A L U that performs operations on data from program counters, instruction registers, register, accumulators, and stacks, all connected by an operand bus. The data buffers temporarily store data moving between the C P U and memory.