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foreign [Music] to my OCR j277 specification complete paper one revision guide newly updated so that it contains hopefully everything thats on the entire paper one syllabus Im sure theres something Ive forgotten somewhere you can let me know in the comments but Im pretty confident this is a really good revision resource that at least touches on every aspect of paper one so we will start at the beginning uh unit 1.1.1 architecture of the CPU this is from the j277 official specification guide and were going to try and cover everything the purpose of the CPU the job of the CPU is to carry out the fetch decode execute cycle sometimes shortened to fde cycle or even Fe cycle if you want to be really short we have three stages fetch the instruction is moved from memory your RAM to the CPU decode the instruction is understood by the CPU execute the instruction is carried out the process is then repeated common CPU components and their function the control unit or CU decodes instructions