Control unit - decodes instructions and sends signals to control how data moves around the CPU and memory, ALU - carries out calculations and logical decisions, e.g. addition, subtraction and comparison, Registers - memory locations with the CPU; they can be accessed very quickly, PC - holds the address of the next instruction to be carried out, MDR - holds data being moved in or out of the CPU, MAR - holds the address of data to ne fetched or where data is to stored, CIR - holds the most recently fecthed instruction waiting to be decoded and executed, ACC - stores the results of any calculations made by the ALU, Address bus - carries memory addresses for locations to be read from or written to, Control bus - carries control signals around the CPU and memory, Data bus - carries data between the CPU and memory,
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Architecture Lesson 1
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KS4
Computing
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