Consists of 4 adders, 1 half adder and 3 full adders
Between bit 0 to 3 set the first number, and from pin 4 to 7 set the second number.
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | A[0] | S[0] | none |
| 1 | A[1] | S[1] | none |
| 2 | A[2] | S[2] | none |
| 3 | A[3] | S[3] | none |
| 4 | B[0] | S[4] | none |
| 5 | B[1] | none | none |
| 6 | B[2] | none | none |
| 7 | B[3] | none | none |