Question: Why does C 0 have to be a 1 in order to use the adder circuit in Figure 6-13 as a subtractor? Figure 6-13 C4

Why does C₀ have to be a 1 in order to use the adder circuit in Figure 6-13 as a subtractor?

Figure 6-13

C4 (disregard) A3 A A Ao From A register 4-bit parallel adder 74LS283 Inverted outputs of B3 B B B B register

C4 (disregard) A3 A A Ao From A register 4-bit parallel adder 74LS283 Inverted outputs of B3 B B B B register Co = 1 23 22 2 20 Represents DIFFERENCE output

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