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Selective-set

The selective-set operation sets to 1 the bits in register A where there are corresponding l's in register B. It does not affect bit positions that have O's in B. The following numerical example clarifies this operation:

1010 A before

1100 B (logic operand)

1110 A after

The two leftmost bits of B are l's, so the corresponding bits of A are set to 1. One of these two bits was already set and the other has been changed from 0 to 1. The two bits of A with corresponding O's in B remain unchanged. The example above serves as a truth table since it has all four possible combinations of two binary variables. From the truth table we note that the bits of A after the operation are obtained from the logic-OR operation of bits in B and previous values of A. Therefore, the OR microoperation can be used to selectively set bits of a register.

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