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实验五 具有上电 / 手动清零功能的时钟显示 一、元器件: 74LS00 、 74LS90 ( 2 个)、 74LS193 ( 2 个) 0.1u 电容、电阻( 阻值自行计算 )

实验五 具有上电 / 手动清零功能的时钟显示 一、元器件: 74LS00 、 74LS90 ( 2 个)、 74LS193 ( 2 个) 0.1u 电容、电阻( 阻值自行计算 ) 二、设计要求 ( 1 )时钟为 24 小时制 ,共四位计数器显示(含两位小时、两位分钟); (基本要求!) ( 2 )有 “上电清零” 电路,即计数器电源通电时,四位计数器输出为零,接着按正常顺序开始计数; ( 3 )有 “手动清零” 电路,即由“开关”或“按键”控制计数器电路清零; ( 4 )“上电清零”及“手动清零”能协调工作;

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实验五 具有上电 / 手动清零功能的时钟显示 一、元器件: 74LS00 、 74LS90 ( 2 个)、 74LS193 ( 2 个) 0.1u 电容、电阻( 阻值自行计算 )

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  1. 实验五 具有上电/手动清零功能的时钟显示 一、元器件: 74LS00、74LS90(2个)、74LS193(2个) 0.1u电容、电阻(阻值自行计算) 二、设计要求 (1)时钟为24小时制,共四位计数器显示(含两位小时、两位分钟); (基本要求!) (2)有“上电清零”电路,即计数器电源通电时,四位计数器输出为零,接着按正常顺序开始计数; (3)有“手动清零”电路,即由“开关”或“按键”控制计数器电路清零; (4)“上电清零”及“手动清零”能协调工作; (5)计数器时钟由实验箱调出1HZ的信号提供;输出由实验箱的BCD码显示模块显示,即计数器输出不需要译码。 建议大家先把连接线整理好!

  2. 没有清零功能的时钟电路 +5V:9根 地线:7根 中间连线:20根 输入:1根 输出:16根 共53根连接线(长线17根)

  3. 连接+5V、地线、高电平、低电平

  4. 连接中间连线中74LS193的“清零”线路

  5. 连接中间连线中74LS90的“清零”线路

  6. 连接输入、输出连线

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