Clear operation
The clear operation compares words present in A and B and produces an all 0's result if two numbers are equal. This operation is achieved by the exclusive-OR micro operation as has own by following example:
1010 A
1010 B
0000 A A B
When A and B are equal, two corresponding bits are either 0 or 1. In either case exclusive-OR operation produces a 0. all-0's result is then checked to determine if tow numbers were equal.