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.

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)