002. OCR A Level (H406-H466) SLR1 – 1.1 Fetch, decode, execute cycle
About this video
OCR Specification Reference
AS Level 1.1.1b
A Level 1.1.1b
In this video we take a closer look at how a CPU actually works by following the stages of the Fetch-Decode-Execute cycle and seeing the effect it has on the various registers.
Key question:
- How does a CPU work?
00:00 Fetch-decode-execute cycle
00:10 Intro
00:15 What is a computer?
01:53 The fetch stage
03:32 The decode stage
04:55 The execute stage
06:09 What does this program do?
06:32 Program branching
08:24 Program branching: Decode and execute stage
09:09 Program branching: Fetch stage
09:27 Key question
09:37 "What does this program do?" - The answer
12:48 Outro
Last updated: 18.03.26
