The program execution of Figure 3.5 is described in the text using six steps. Expand this description to show the use of the MAR and MBR.

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Memory CPU registers Memory CPU registers 3 0 0PC300 1 9 4 0 AC 301 5 9 4 1 19 4 0 IR 302 29 4 1 3 0PC 0 0 0 3 AC 1 9 4 0IR 302 2 9 4 1 940 0 0 0 3 940 0 0 0 3 Step 1 Step 2 Memory CPU registers Memory CPU registers 3 0 2 PC 3 0 IPC300 1 9 4 0 0 0 0 3 AC301 5 9 4 1 5 9 4 IR 302 2 9 41 301 5 9 4 I 940 0 0 0 3 941 0 0 0 2 3 +2 5 941 0 0 0 2 Step 3 Step 4 CPU registers Memory Memory 300 1 9 4 0 CPU registers 3 0 2 PC 300 1 9 4 0 3 03 PC 0 00 5 AC 2 9 4 IR 2 9 4 IR 302 2 9 4 1 940 0 0 0 3 940 0 0 0 3 941 0 0 0 5 Step 5 Step 6 Figure 3.5 Example of Program Execution (contents of memory and registers in hexadecimal)