Application of Logical Micro-operation

Logical Micro Operation

Micro-operation is an elementary operation performed with the data stored in registers.

Logic micro-operation perform logic operations such as AND, OR, complement and XOR on the strings of bits stored in registers. Special symbols are used for the logic micro-operations AND, OR and complements to different them from the corresponding symbol used to express Boolean functions.

Figure : Hardware Implementation of Logic Circuit

Application of Logical Micro Operation

There are four applications of logical micro-operation: Selective Set Operation, Selective Complement Operation, Selective Clear Operation, Mask Operation

Selective Set Operation:

In this operation, the bits in register A will change where corresponding register B bit is 1. The resultant bit is set to 1 in register A. If register B bit has 0, it will not affect register A bit.

The OR microoperation can be used to selectively set bits of a register.

Selective Complement Operation

In this operation, the bits in register A will complement, where corresponding register B bit is 1. If register B bit has 0, it will not affect register A bit.

The ex-OR microoperation can be used to selective complement bits of A register.

Selective Clear Operation

In this operation, the bits in register A will clear (set 0), where corresponding register B bit is 1. If register B bit has 0, it will not affect register A bit.

The corresponding microoperation is A ß A ∧ B’.

Mask Operation

The mask operation is similar to the selective clear operation. But in this operation, the bits in register A will clear (set 0), where corresponding register B bit is 0. If register B bit has 1, it will not affect register A bit.

The mask operation is an AND microoperation.

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