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computer systems, Embedded systems, image - Coggle Diagram
computer systems
CPU
The purpose is to fetch, decode, execute instructions
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Fetch
- Copy memory address from the program counter to the MAR.
- Copy the instruction stored in the MAR address to the MDR.
- Increment the program counter to point to the address of the next instruction, ready for the next cycle.
execute
instruction is preformed this could load data, write data do calculation or logic operations change the address in the pc or halt the program
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Decode Instruction. The instruction in the MDR is decoded by the CU. The CU many then prepare for the next step, e.g. by loading values into the MAR or MDR
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