T3-pc1d-cp3/20/2024 ![]() Step 3: The content of the MBR is moved to the instruction register(IR).Program counter is incremented by one, to get ready for the next instruction.(These two action can be performed simultaneously to save time) Step 2: The address in MAR is placed on the address bus, now the control unit issues a READ command on the control bus, and the result appears on the data bus and is then copied into the memory buffer register(MBR).Step 1: The address in the program counter is moved to the memory address register(MAR), as this is the only register which is connected to address lines of the system bus.ISRO CS Syllabus for Scientist/Engineer ExamĪt the beginning of the fetch cycle, the address of the next instruction to be executed is in the Program Counter(PC).ISRO CS Original Papers and Official Keys.GATE CS Original Papers and Official Keys. ![]()
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