Half-subtractor is a combinational circuit capable of subtracting a binary number from another binary number. It produces two outputs: difference and borrow. The borrow output specifies whether a binary number 1 is borrowed to perform subtraction or not.
Figure (a) shows the graphic symbol of half-subtractor. The inputs are A and B. The output D is the result of subtraction of B from A and output B0 is the borrow output.
| A | B | D | B0 |
|---|---|---|---|
| 0 | 0 | 0 | 0 |
| 0 | 1 | 1 | 1 |
| 1 | 0 | 1 | 0 |
| 1 | 1 | 0 | 0 |
Table 1: Truth Table of harlf-subtractor
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