摘 要：如今市场上的智力竞赛抢答器已相称成熟，但由良多电路构成，路线庞大，可靠性不高，功效也比力简单，特别是抢答器路数良多时，实现起来比较坚难。所以设计以单片机为控制中心的新型智能抢答器，利用STC89C51单片机和围接口实现抢答系统，连系单片机的定时器/计数器功效，将软、硬件有机地连系起来，使得体系可以准确地进行计时，使数码管能够正确显示抢答结果。所设计的系统具有高效实用性、操作简单、反应快的特点。 76072

该抢答器能供8人同时使用,它主要实现以下功能:(1)为8位参赛选手各提供一个抢答按键,分别编号A1,A2，A3，A4，A5，A6，A7，A8;(2)电路具备清零和抢答开关;(3)电路具有锁存和显示功能;(4)电路具有定时抢答和报警功能。该抢答器的设计基本满足了现实生活中各类抢答竞赛中的的各种需要。

毕业论文关键词：智能抢答器 单片机 定时器/计数器 

Abstract: The market of intellectual competition responder has been quite mature at present, but composed of many circuits, circuit complexity, reliability is not high, function is relatively simple, especially responder way many, it is difficult to realize。 So the design of single-chip microcomputer as the control center of the new intelligent vies to answer first, using STC89C51 MCU and around the interface to achieve Responder system, combined with the SCM timer / counter function, the soft, hardware organically, so that the system can accurately correct timing, so as to make the digital tube, which can be used to correct answer results。 The design of the system has the advantages of simple operation, fast response, practical and efficient of Characteristics。 

The responder can for 8 people at the same time。 It mainly realizes following functions: (1) for 8 contestants each provide an answer key, respectively numbered A1, A2, A3, A4, A5, A6, a7, A8, (2) circuits have cleared and vies to answer first switch; (3) circuit has latch and display function; (4) circuit with timing responder and alarm function。 The design of the responder basically meet the real life vies to answer first contest of various kinds of needs。

Keywords: Intelligent Responder Microcontroller Timer / Counter

目    录

1。绪论 5

1。1抢答器发展概况 5

1。2本课题研究的意义 7

1。3 应解决的关键问题 7

2。 方案设计 8

2。1方案设计特点 8

2。2 STC89C51单片机介绍 8

2。3时钟电路 11

2。4复位电路 11

2。5 STC89C51中断技术概述 12

3。硬件电路设计 13

3。2单元电路设计 15

3。2。1抢答器电路 15

3。2。2时序控制电路设计 15

3。2。3复位电路的设计 15

3。3时钟震荡电路 16

3。4报警电路设计 16

3。5显示模块 17

3。6抢答按键 18

4。系统主程序设计流程图 20

5。调试 20