Timing Diagram 8085 Microprocessor A timing diagram of a microprocessor depicts graphically the activities that are taking place at different instants of time (T states) inside the microprocessor. As discussed previously, microprocessor fetches an instruction from the memory, decodes it, fetches the operands if required and then executes the instruction. An execution of a instruction may take one to six machine cycles and a machine cycle may contain three or more T states. Before we study the timing diagram, the following terminologies should be clear. Instruction cycle – It is the total time by the microprocessor to fetch, decode, fetch operands and execute the instruction. Machine Cycle – It is time taken by the processor in completing the single task, for example fetching an OPCODE,