参考文献
1．康华光主编，电子技术基础(数字部分)，高等教育出版社 2．标准集成电路数据手册TTL电路，电子工业出版社
致 谢
不知不觉，六周的毕业设计结束了。我的毕业论文已整理完毕，电路调试进展良好。毕业设计的完成意味着我的大学学习生活即将结束，从此我将进入一个新的人生旅途、开始一段崭新的生活——工作。在此，我衷心地感谢所有在我做毕业设计期间帮助过我的人。
首先我要感谢我的指导老师李杰的大力帮助和支持。在整个设计过程当中，李老师在大局上指导我毕业设计的每一进程，还在百忙中抽空为我答疑解难，帮我分析讲解毕业设计中所遇到的问题。不仅如此，李老师还无私的给我提供了丰富的学习资源和良好的学习环境，为我的毕业设计带来了很大方便。同时在我完成毕业设计的过程中提供了很多指导性的意见，使我受益匪浅。另外，李老师渊博的学识、严谨的治学态度和为人给了我很大的教育，这些将使我终身受益。在此，我衷心感谢李老师给予我的帮助和教育。
此外，我还要感谢夏九和李国华同学给予我的无私的帮助，他们在程序编写和调试过程中给予了我莫大的帮助。在此，我真诚地感谢他们。
最后，我要感谢我的母校——天津工程师范学院，在校期间，这里给我留下了美好的回忆。特别是在我即将踏上工作岗位的同时，毕业设计整个过程给了我这样一个锻炼的机会，使我加深了对以前知识的理解和巩固，拓宽了知识面，也提高了我对所学知识的综合应用能力。我要对母校说：母校有我三五载，我爱母校一万年。祝愿母校的将来更美好！
附录1：汽车尾灯控制电路设计电路原理图
附录2 主程序
org 00h
ajmp start
ORG 001BH ;定时器T1中断程序入口 LJMP time1 ;跳至INTT1执行 org 0030h start: mov TMOD,#10h mov IE,#88h MOV TH1,#00h MOV TL1,#00h mov r7,#03h; setb TR1 turn: jnb p2.0,is_key jnb p2.1,is_key
jnb p2.2,is_key jnb p2.3,is_key orl p1,#0ffh; is_key : jb p2.3,no_check; anl p1,#0c0h; jmp turn no_check:
jmp turn
time1: push acc
mov TH1,#010h mov TL1,#00h
jb p2.0,left djnz r7,return mov r7,#3 xrl p1,#3fh
left: jb p2.1,right dec r7;
cjne r7,#6,next1; mov p1,#0fbh next1: cjne r7,#3,next2; mov p1,#0fdh; next2: cjne r7,#0,right; mov p1,#0feh mov r7,#9;
right: jb p2.2,return dec r7; cjne r7,#6,next11; mov p1,#0f7h next11: cjne r7,#3,next21; mov p1,#0efh; next21: cjne r7,#0,return; mov p1,#0dfh mov r7,#9;
return: pop acc reti end
英文资料及中文翻译
6 TRANSMISSIONS OF DIGITAL DATA:
INTERFACES AND MODEMS
(From Introduction to Data Communications and Net Working,
Behrouz Forouzan)
Once we have encoder our information into a format that can be transmitted, the next step is to investigate the transmission process itself. Information-processing equipment such as PCs generate encoded signals but ordinarily require assistance to transmit those signals over a communication link. For example, a PC generates a digital signal but needs an additional device to modulate a carrier frequency before it is sent over a telephone line. How do we relay encoded data from the generating device to the next device in the process? The answer is a bundle of wires, a sort of **munication link, called an interface.
Because an interface links two devices not necessarily made by the same manufacturer, its characteristics must be defined and standards must be established. Characteristics of an interface include its mechanical specifications (how many wires are used to transport the signal); its electrical specifications (the frequency, amplitude, and phase of the expected signal); and its functional specifications (if multiple wires are used, what does each one do?). These characteristics are all described by several popular standards and are incorporated in the physical layer of the OSI model.
** DIGITAL DATA TRANSMISSION
Of primary concern when considering the transmission of data from one device to another is the wiring. And of primary concern when considering the wiring is the data stream. Do we send one bit at a time, or do we group bits into larger groups and, if so, how? The transmission of binary data across a link can be accomplished either in parallel mode or serial mode. In parallel mode, multiple bits are sent with each clock pulse. In serial mode, one bit is sent with each clock pulse. While there is only one way to send parallel data, there are two subclasses of serial transmission: synchronous and asynchronous (see Figure 6-1).
Parallel Transmission
Binary data, consisting of 1s and 0s, may be organized into groups of n bits each. Computers produce and consume data in groups of bits much as we conceive of and use spoken language in the form of words rather than letters. By grouping, we can send data n bits at a time instead of one. This is called parallel transmission.
Data transmission
Parallel Serial
电子设计毕业设计-汽车尾灯控制电路设计论文资料-正文
