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How CPU executes a program (video)
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#cpu#fetch-decode-execute#assembly
Fetch-Decode-Execute Cycle
John Philip Jones
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- Recommended by 2 people: 1 in engineering communities and 1 curated list.
- Presented by John Philip Jones
Beginner. No background in the topic needed.
213K views13 years ago2 recommendations
HardwareSystems programmingCPUs and computer architectureOperating systems
John Philip Jones explains the fetch-decode-execute cycle of a CPU using a simple machine code instruction.
Shows a typical fetch decode execute cycle for a machine code instruction (that uses implied addressing) #JohnPhilipJonesWhy it's here
2 people recommend thisWhat people say. Recommended as a clear explanation of how a CPU executes a program.
u/hughkin r/compsci • Recommends
On “What is the mode by which machine language is converted to physical voltages?”
A program in machine language is stored as patterns of ones and zeroes and is read into main memory from storage. There it is also stored patterns of ones and zeroes (high and low voltages).
The magic is something called an instruction decoder. This fetches the information at the location pointed to by the program counter and then decodes the instruction and executes it. This interpretation can be anything from a micro machine of its own (with its own program) to direct implementation using logic gates. Execution will then enable particular logic to act on the data as directed. For example if we have a register containg the value 0 and we want to increment it, at the low level the CPU must…