文档介绍：实验七触发器与计数器的应用杭州电子科技大学电工电子实验中心数字电路与逻辑设计实验 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 一、实验目的? 。? ,掌握用触发器构成计数器的方法。? ,掌握任意进制计数器的构成方法 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 二、实验所用器件型号及管脚排列 1S D1 CP 1D1R D2S D2 CP 2D2R D 1Q 2Q 1Q 2Q S S C1 1DR R 2D C1 74LS74 D 触发器管脚图与逻辑符号 74LS112 JK 触发器管脚图与逻辑符号 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 74LS90 的管脚图与逻辑符号 74LS90 的功能表输入 R D =R 1·R 2 P D =P 1·P 2 CP 1 0 × 0 1 × 0 0 ↓输出 Q 3 Q 2 Q 1 Q 0 0 0 0 0 1 0 0 1 加法计数 8421 BCD 码 5421 BCD 码序号 Q 3Q 2Q 1Q 001234567890 0 0 0 0 0 0 0 1 0 01 0 0 01 1 0 1 0 0 0 1 0 1 0 1 1 0 0 1 1 1 1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 1 0 01 0 0 01 1 0 1 0 0 1 0 0 0 1 0 0 1 1 0 1 0 1 01 1 1 1 0 0 0 0 0 0 Q 0 Q 3 Q 2 Q 1 74LS90 不同码制状态表 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 74LS161 的管脚图与逻辑符号 74LS161 功能表 Evaluation only. Evaluation only. Created with Client Profile . Created with 3