Instruction Cycle

Instruction Cycle is the cycle which is used to fetch,decode,execute the instruction of the computer which was given by us.Instruction Cycl...

Instruction Cycle is the cycle which is used to fetch,decode,execute the instruction of the computer which was given by us.Instruction Cycle has mainly 4 phase that are Fetch Phase,Decode Phase,Decision Phase and Execution Phase.

Flow Chart/Diagram of Instruction Cycle:-




where AR=Address Register,
PC=Program Counter,
IR=Instruction register,
MRI=Memory Reference Instruction,
RRI=Register Reference Instruction,
I/O I=Input-Output Instructions.

Fetch Phase:-In Fetch phase,SC=0,AR<--Pc,IR<--M[AR] then PC<--PC+1.

Decode Phase:-In decode phase  we decode operation code and perform AR<--IR and I<--IR operations.

Decision Phase:-In decision phase we decide where the instruction goes.

Execute Phase:-In this phase we execute instructions.



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All Computer Topics: Instruction Cycle
Instruction Cycle
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