The central processing unit(CPU)

The central processing unit(CPU)

1. Fetch-decode-execute cycle

   • Fetch- the instruction is moved to the CPU
     • Decode-the instruction is understood by the CPU
       • Execute- the instruction is carried out

2. CPU

   • Execute programs using the fetch-decode-execute cycle
     • Memory
       • Stores program operations and data while a program is being executed. There are several types of memory, including: registers, cache, RAM and virtual memory.

3. Storage

   • stores programs and files long term, even when they are not in use. Devices such as hard drivesUSB memory sticks or SD cards are used to store files such as photos, music and software applications long term.

4. Cache memory

   • A piece of temporary memory. It can refer to a part of the RAM, storage disk, CPU, or an area for storing web pages.

5. RAM

   • Random access memory. This is volatile memory that is constantly being written to and read from. It does not retain its contents without a constant supply of power. When a computer is turned off, everything stored in its RAM is lost.

6. Raspberry PI

   • A low budget, pocket sized computer which is easy to program.

7. Register

   • The section of high speed memory within the CPU that stores data to be processed.

8. Mother board

   • Connects all componenets

9. ROM

   • Read Only Memory. The difference between ROM and RAM are: ROM is a form of permanent storage while RAM is a form of temporary memory.