How a microprocessor 8085 does executes an instruction?
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Each instruction of the 8085 processor consists of one to five machine cycles, i.e., when the 8085 processor executes an instruction, it will execute some of the machine cycles in a specific order.
The processor takes a definite time to execute the machine cycles. The time taken by the processor to execute a machine cycle is expressed in T-states.
One T-state is equal to the time period of the internal clock signal of the processor.
The T-state starts at the falling edge of a clock.
In this time, the first, 3 T-states are used for fetching the opcode from memory and the remaining T-states are used for internal operations by the processor.
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