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1. The CPU Typeit
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The fetch-decode execute cycle
First, the contents of the program counter are copied to the , immediately after which, the value in the program counter is . The contents of the memory address register are transmitted along the , while a 'read' command is sent via the . The instruction in memory is transmitted along the to the register.
From here, the instruction is sent within the CPU to the current instruction register, at which point the decodes the instruction in advance of executing it. What happens next depends on the exact nature of the instruction. If calculations are required, the performs the calculation, with any intermediate results being stored in the , or in some other purpose register.