The CPU
Mind map covering all CPU information needed for OCR
- Created by: Noye
- Created on: 28-03-13 19:57
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- The Central Processing Unit
- Definition: Hardware that executes programs and manages the rest of the hardware
- Purpose
- Fetch data and instructions from memory
- Decode and execute instructions
- Perform calculations
- Manage movement of data and instructions to and from peripheral devices
- Purpose
- Brain: parts that THINK, parts that REMEMBER & parts that CONTROL
- Main Memory
- Programs are first loaded here.
- Processor
- Main Memory
- Programs are first loaded here.
- Given the START ADDRESS of the program in the memory
- FETCHES, DECODES & EXECUTES
- Speed is called the clock speed. It is measured in Hertz
- Hertz: Number of ELECTRICAL CYCLES PER SECOND/ the RATE ELECTRICAL CURRENT CHANGES in the actual circuits
- MULTI-CORE can process more than one instruction at a time
- Each core has to work on DIFFERENT PROGRAMS OEPERATING IN PARALLEL or it complicates processing
- Main Memory
- Cache
- Stores frequently used instructions and data for faster access.
- Increasing cache memory is more expensive than increasing main memory
- Main Memory
- Definition: Hardware that executes programs and manages the rest of the hardware
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