Each one of these resources operate once at a time, not together.
Decoder unit performs generation of clock phases necessary to execute the steps you described above.
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...how does processor know that which port pin is high and which port pin is low ?
result should be store in which memory rom or ram?
mcro controller contain mainly ALU, control unit ROM , RAM, PORTNo result may be saved at ROM memories ( conceptually means Read Only Memory ).
In fact, for program memories, most current processors employ FLASH ones rather than ROM, due to their ability to be reprogrammed.
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where does we use ram memory ?
For almost everything.
These memories are used for store data temporarily.
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we have fetched , decoded and executed instruction but where does we use ram memory there may be done three process
fetching, decode and executing
during all process when does ram work?
Ok, now I got the question.
The user addressable RAM is used during program execution.
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fetching - decoder take command from rom memory
decode - decoder decode instruction and tell the cpu what to do like add, sub
execution- alu do the operation like add, sub.. and sand the result into rom memory
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