Logic Experiment 4 老師：伍紹勳助教：江長庭鄭仲傑.

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Presentation transcript:

Logic Experiment 4 老師：伍紹勳助教：江長庭鄭仲傑

BCD Adder Equipment： IC：7408 x 1、7432 x 1、7483 x 2、7447(DCBA) x 1、LED x 1、7-Segment LED x 1

Review BCD number addition Two units digit decimal number ex: 7+8=15 BCD : 0 1 1 1 +1 0 0 0 1 1 1 1 +0 1 1 0 0 0 0 1 0 1 0 1 Determine whether to add 6 or not !!!! >9 => add 6 Tens digit Units digit

F = T8T4 + T8T2 + K When to add 6? T8T4 + T8T2 Binary Sum BCD Sum K T8 T4 T2 T1 C S8 S4 S2 S1 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 1 2 0 0 0 1 0 0 0 0 1 0 2 3 0 0 0 1 1 0 0 0 1 1 3 4 0 0 1 0 0 0 0 1 0 0 4 5 0 0 1 0 1 0 0 1 0 1 5 6 0 0 1 1 0 0 0 1 1 0 6 7 0 0 1 1 1 0 0 1 1 1 7 8 0 1 0 0 0 0 1 0 0 0 8 9 0 1 0 0 1 0 1 0 0 1 9 A 0 1 0 1 0 1 0 0 0 0 10 B 0 1 0 1 1 1 0 0 0 1 11 C 0 1 1 0 0 1 0 0 1 0 12 D 0 1 1 0 1 1 0 0 1 1 13 E 0 1 1 1 0 1 0 1 0 0 14 F 0 1 1 1 1 1 0 1 0 1 15 10 1 0 0 0 0 1 0 1 1 0 16 11 1 0 0 0 1 1 0 1 1 1 17 12 1 0 0 1 0 1 1 0 0 0 18 13 1 0 0 1 1 1 1 0 0 1 19 When to add 6? 1. T8 T4 T2 T1 > 9 00 01 11 10 00 01 11 1 1 1 1 10 1 1 T8T4 T2T1 T8T4 + T8T2 2. Carry is 1 F = T8T4 + T8T2 + K

IC 7483 ( 4-bits full adder )

7-Segment LED Vcc a b c d e f g dp Vcc

IC 7447

務必加上電阻 A,K connect to +5V dp not connect

22 ohm

Requirement Two units digit decimal number addition in BCD Input : two BCD number Output : units digit – 7-Segment LED tens digit – LED Input不能大於9

Input T8T4 + T8T2 + K Add 6 or not A,K connect to +5V dp not connect Units Digit Tens Digit ( LED )