Memory BYU CS 224 Instruction Execution Phases25 Addressing Modes Registers Address Bus Data Bus (+1 cycle) CPU ADDER 3 Word Instruction cnt add.w cnt,var ; M[var] += M[cnt] 0x000c PC var Address Bus Data Bus (+1 cycle) PC Data Bus (+1 cycle) 0x0218 IR Data Bus (1 cycle) 0x5090 PC ALU Address Bus +2