Initiating The Cycle
The cycle starts immediately when power is applied to the system using an initial PC value that is predefined for the system architecture (in Intel IA-32 CPUs, for instance, the predefined PC value is 0xfffffff0
). Typically this address points to instructions in a read-only memory (ROM) which begin the process of loading the operating system. (That loading process is called booting.)
Read more about this topic: Instruction Cycle
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