The Purpose of the CPU (OCR GCSE Computer Science): Flashcards
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Purpose of CPU
Purpose of CPU
Carry out the processing of data on the computer system
Cycle CPU performs
Cycle CPU performs
Fetch-decode-execute cycle
Three stages of CPU cycle
Three stages of CPU cycle
Fetch, Decode, Execute
First step in fetch stage
First step in fetch stage
Address from PC copied to MAR
Second step in fetch stage
Second step in fetch stage
Instruction from MAR fetched and copied to MDR
Third step in fetch stage
Third step in fetch stage
Instruction in MDR copied to CIR
Fourth step in fetch stage
Fourth step in fetch stage
Increment the PC
What decodes instruction in decode stage
What decodes instruction in decode stage
Control unit
Where data may be loaded in decode stage
Where data may be loaded in decode stage
MDR
What ALU used for in execute stage
What ALU used for in execute stage
Logic or calculations
Where result stored in execute stage
Where result stored in execute stage
Accumulator
What happens during fetch stage
What happens during fetch stage
Instruction retrieved and prepared for processing
What happens during decode stage
What happens during decode stage
Control unit decodes the instruction
What happens during execute stage
What happens during execute stage
Instruction performed, may use ALU