Question $2$

Step $3$: Fetch

CPU RegistersIlustrate a partial program execution mechanism showing the contents of memory and processor registers at each step in

a hexadecimal format. The program fragment should add the contents of the memory words which are present at

addresses $61A,616$ and $61$ C and only the final result has to be stored back to memory. Show all the instruction cycles in

detail each consisting of a fetch stage and an execute stage. Note that all the values represented within the tables are in a

hexadecimal format.

The list of opcodes is as follows:

$0100=$ Add to AC from memory

$1101=$ Store AC to memory

$1011=$ Load AC from memory

Refer to the steps in the images below to understand the sequences of stages.

Step $1$: Fetch

Memory

Step $2$: Execute

Memory

CPU Registers