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Systems architecture - Coggle Diagram
Systems architecture
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Purpose of the CPU
Fetch
The address of the next instruction to be processed is stored in the program counter, the instruction at that location is fetched from from RAM
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CPU parts
Control Unit
Decodes instructions, sends control signals to control how data moves around the CPU
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Cache
Fast to access data from
On the CPU, so faster to access data from than RAM which is external to the CPU
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Embedded systems
A device which has a CPU embedded, usually only performs one dedicated function
Takes input, processed data and delivers an output
Washing machine, microwave, coffee maker, engine management system
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Fetch - PC value copied to MAR, PC value incrememented. Instruction in MAR read from RAM
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Execute - data at MAR is read from RAM, ALU performs any calculations, value in the MDR is written to the address in the MAR