As we know that in Mathematics we can write 5+(-2) instead of 5-2(both result are same),So this maths rule is also apply in digital binary ...
As we know that in Mathematics we can write 5+(-2) instead of 5-2(both result are same),So this maths rule is also apply in digital binary no. also.In this situation we can use both circuit(adder-subtracter) at a same time.
Half Subtracter:-
Truth table of Half Subtracter:-
Difference=A'B+AB'=A⊕B
Borrow out=A'B
Block Diagram:-
Logic Circuit:-
4 Bit Parallel Adder-Subtracter:-
4 Bit Serial Adder-Subtracter:-
Half Subtracter:-
Truth table of Half Subtracter:-
| A | B | Difference | Borrow out |
|---|---|---|---|
| 0 | 0 | 0 | 0 |
| 0 | 1 | 1 | 1 |
| 1 | 0 | 1 | 0 |
| 1 | 1 | 0 | 0 |
Difference=A'B+AB'=A⊕B
Borrow out=A'B
Block Diagram:-
Logic Circuit:-
4 Bit Parallel Adder-Subtracter:-
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