The contents of the program counter, which contains the address of the next memory location, is transferred to the memory address register. - STEP 1, The contents of the memory address register, which contains the address of the next memory location, is transferred to RAM via the address bus - STEP 2, The instructions found at addressed memory location are transferred to the memory data register via the data bus. - STEP 3, The contents of the memory data register, which contains the data that has just been fetched, is transferred to the current instruction register - STEP 4, The contents of the current instruction register, which contains the instruction made up of an opcode and operand, is decoded by the control unit - STEP 5, The instruction is executed - STEP 6, The arithmetic logic unit carries out any calculations - STEP 7, Results are stored in the Accumulator - STEP 8, Data may be written back to RAM. - STEP 9,

CPU 1- Execute Cycle (hard)

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