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今天下午,我用2片74HC02(或非门)和2片74LS112(JK触发器)成功实现了十进制计数器

Floor 1 巨大八爪鱼 2/9/17 23:11

当计数值为9时,进位端为高电平。

明天还要实现用数码管显示出相应的数字,以及利用RC电路自动振荡。

Floor 2 巨大八爪鱼 2/9/17 23:17

把JK触发器的J、K端全部短路,接成T触发器。
最低位T0 = 1(恒为高电平)
T1 = (Q0' + Q3)'
T2 = (Q0' + Q1')'
进位端C = (Q0' + Q3')'

用去3个或非门

X = (((T2 + T2)' + Q2')' + (Q0' + Q3')')'
最高位T3 = (XX)',用去5个或非门


刚好把8个或非门全部用完

Floor 3 巨大八爪鱼 2/9/17 23:18
因为每个JK触发器都有Q端和Q'端,所以组成的逻辑函数式很好化简,因为正反变量都有。

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