Why does C 0 have to be a 1 in order to use the adder circuit in

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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

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Digital Systems Principles And Application

ISBN: 9780134220130

12th Edition

Authors: Ronald Tocci, Neal Widmer, Gregory Moss

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Question Posted: Nov 15, 2023 09:35 AM

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Why does C 0 have to be a 1 in order to use the adder circuit in

Question:

C4 (disregard) A3 A₂ A₁ Ao From A register 4-bit parallel adder 74LS283 Inverted outputs of B3 B₂ B₁ B₂ B register Co = 1 23 22 2₁ 20 Represents DIFFERENCE output

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Digital Systems Principles And Application

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