西北师范大学知行学院
数字电子实践论文
课题：74ls161组成的十进制加法计数器
（置数法）
班级：14电本
学号：14040101114
姓名：于能海
指导老师：崔用明
目录
第1章前言 (1)
1.1 摘要 (1)
1.2 设计目的 (2)
1.3 设计内容及要求 (2)
第2章设计方案 (3)
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2．1主要芯片功能介绍 (3)
2.2.1 四位二进制计数器74161介绍 (3)
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2.2 工作原理 (4)
第3章硬件设计 (4)
3.1 单元电路设计 (4)
3.2 总硬件电路图 (5)
第4章仿真与试验 (6)
4.1 仿真结果 (6)
4.2 调试中遇到的问题 (7)
第5章结论和体会 (8)
第1章前言
1.1 摘要在数字电路技术的课程中，计数器的功能是记忆脉冲的个数,它是数字系统中应用最广泛的基本时序逻辑构件。计数器在微型计算机系统中的主要作用就是为CPU和I/O设备提供实时时钟，以实现定时中断、定时检测、定时扫描、定时显示等定时控制，或者对外部事件进行计数。一般的微机系统和微机应用系统中均配置了定时器/计数器电路，它既可当作计数器作用，又可当作定时器使用，其基本的工作原理就是"减1"计数。计数器：CLK输入脉冲是一个非周期事件计数脉冲，当计算单元为零时，OUT输出一个脉冲信号，以示计数完毕。
本十进制加法计数器是基于74161芯片而设计的，
该十进制加法计数器设计理念是用于工厂流水线上产品计数，自动计数，方便简单。
关键词：74ls161计数器
Introduction
In the course of digital circuit technology, the counter memory function is the number of pulses, it is a digital system, the most widely used basic sequential logic components. The main role of the counter in the micro-computer system is to provide real-time clock for the CPU and I / O devices to achieve the timer interrupt, timing detection, scheduled scanning, the timing display timing control, or to count external events. General computer systems and computer application systems are equipped with a timer / counter circuit, it can as a counter action, but also as a timer, the basic working principle is "minus 1" count. Counter: CLK input pulse is a non-periodic event count pulses to zero when calculating unit, OUT outputs a pulse signal, to show the count is completed.
The decimal addition counter is designed based on the 74161 chip, the low potential sensor senses when to rely on external signals, sensors in an object within the sensing range, otherwise it is a high potential. Within the sensing range of the sensor when an object is moved out of date, sensor potential from high to low and then high, appears on the edge. Counter is automatically incremented and displayed on a digital control. The decimal addition counters have two seven-segment LED. It can count from 0 to 99 objects, and easy to expand.
The design concept of decimal addition counter is used to count on a factory assembly line products, automatic counting, convenient and simple.
Keywords:74ls161counter
