第六课--Interrupt
新概念第六课
One of the thieves was struck by a heavy statue, but he was too busy helping himself to diamonds to notice any pain. help oneself to sth.自便 -- My roommate helped herself to my clothes without asking me.
grab v.抢夺, 掠夺, 夺取（= seize suddenly） -- He grabbed me by the arm. -- He grabbed the coin and ran off. 他抓起硬币就跑了。 snatch vt.抢, 夺取 （= catch sth. /sb suddenly and violently） -- The big bird snatches the hen from the ground. Seize v.抓住, 逮住, 夺取（强调抓住、抓到的结果） -- Fear seized her. 她突然感觉很恐惧。 catch vt.捕获, 赶上(车船等) （= get hold of sth/sb moving） -- catch mouse / catch bus / catch a thief grasp 强调“掌握” get the hang of -- We have already grasped six thousand words. Hold 强调抓牢、抓紧（catch hold of 抓住） -- He is holding an umbrella.
4>ir -- 加在以r开头的形容词之前 -- regular（adj.规则的） àirregular（adj.不规则的） -- rational（adj.理性的） àirrational（adj.无理性的） -- resistible（adj.可抵抗的） àirresistible（adj.不可抵抗的） 5>in --主要用于其它字母开头的词之前 -- human（adj.人性的） àinhuman（adj.野蛮的） -- correct（adj.正确的） àincorrect（adj.不正确的） -- justice（n.正义, 公平） àinjustice（n.不正义, 不公平） -- sincere（adj.真诚的） àinsincere（adj.虚假的, 不真诚的）
综合英语一上册第六课lessonsix
综合英语一上册第六课lessonsixLesson sixHow Dictionaries Are MadeIt is widely believed that every word has a correct meaning, that we learn these meaning mainly from teacher and grammars, and that dictionaries and grammar books are the highest authority. in matters of meaning and usage, Few people ask by what authority the writers of dictionaries and grammars say what they say. I once got into an argument with an woman over the pronunciation of a word and offered to look it up in the dictionary. The English woman said firmly,“what for? I am English. I was born and brough t up in England. The way I speak is English.” Such confidence about one’s own language is not uncommon among the English. In the United States, however anyone who is willing to quarrel with the dictionary is regarded as out of his mind.Useful ExpressionsOffer to do sth. 主动提出做某事Bring up 抚养,养大Quarrel with (sb.) 与某人争吵Be out of one’s mind 疯了Begin with 以…….开始Huge/great amount of 大量的(不可数)A (large) number of 大量的(可数)According to 按照That is to say 也就是说From……to 从……..到Regard……as 看做,当做Set up 制定Provide sth. For sb. 给某人提供某物Look up 查字典/拜访某人Please look up the new word in your dictionary.If you don’t know the word, look it up in the dictionary.I looked up a classmate when I went to Shanghai.What for 为什么You are leaving us? What for?What are you studying German for?He knows clearly what he has come here for.Arrive atThe two parties finally arrived at an agreement in the end.Apply to 适用于This law does not apply to foreign companies.Divide up (between/ among) 分配,分享,分担they don’t know hwo to divide up the workbase on /upon 以….为基础.把基础….放在this film I based on a novel by a famous writer.Word ListWidely 广泛的,普遍的Mainly 主要地Grammar 语法书,语法Authority 权威著作,学术权威Usage (词语的)惯用法Argument 争论,争辩,争吵Firmly 坚定地,坚决地Confidence 把握,自信心Uncommon 不普通的,不寻常的Edit 编辑Editing 编辑Define 给(词语等)下定义Definition (词语等的)定义Firsthand 第一手的,直接的existing 现存的,目前的,现行的amount 数量literature文献,文学subject 题目,题材,主题occupy 占(时间,空间,场所等) decade 10年alphabetical 按字母表顺序的sorting 整理,分类illustrate (用例子等)说明represent 体现,典型地反映,代表carefully 仔细地,聚精会神地hard-and-fast (规则等)不可改变的influence 影响,堆…..起作用given 特定的ruling 占指导地位的,统治的statement 陈述,声明record 记录various 各种各样的,不同的author 著作家,作家historical 历史学家,史学工作者lawgiver 拟定法典者,立法者scatter 撒播guide 引导,指导bind 约束,束缚invention 发明(物),创造(物)In the United States, however, anyone who is willing to quarrel with the dictionary regarded as out of his mind Oxford English dictionaryThey are arranged in alphabetical orderCouldn’t have done sth. 表示过去不可能做成某事Translate1)和这种人交朋友,你简直是疯了You are out of your mind if you make friends with this kind of man.2)偷东西被认为是很坏的事Stealing is regarded as a bad thing.3)就这件事你们做出了什么样的决定?What decision have you made in matters of this?4)这些规定对6岁以下的孩子不适用These rules can not apply to the children under six.5)他常常为儿子的教育问题和妻子吵架He is always quarreling with his wife over the ch ild’s education.6)这些名字是按字母顺序排列的These names are arranged in alphabetical order.7)据他说,钱被几家公司平均瓜分了He said that the money was divided up among a few companies8)你的计划是以什么为依据的?What does your plan base on ?9)对这些工人应该按其劳动的多少来付酬.These workers should be paid by according to the amount they have done.10)下周从星期一到星期五我都会很忙.I will be quite busy from Monday to Friday next week11)学英语从基础(abc)开始.Learning English begins with ABC12)我从来没有听说过这个人I have never learned of this man13)学生们因自己的那些可笑的错误而发笑The students laughed over their foolish mistakes.14)他正在找一个更好的工作.He is looking for a better job, to the best of his abilityThat man stood up and went out.He is an excellent player and never gives upHe has thrown away his old jacketI turned on my radioThe French guest arrived in Beijing on MondayShe is taking care of his sick father.Susan is not getting along well with her classmates.We will get off at next bus stop.1)How do people generally look upon dictionaries? In the United States if a person does notagree with the dictionary how is he or she looked upon?Generally, people look upon dictionaries and grammar books as the highest authority in matters of meaning and usage.In the united States, anyone who is willing to quarrel with the dictionary is regarded as out of his mind.2)You didn’t know how dictionaries were made before you read the text, did you? The writingof a dictionary is not a small job, is it? There is an easy way, isn’t there? That isn’t really dictionary writing, is it?I didn’t know how dictionari es were made before reading the text. The writing of a dictionary is not a small job. There is no easy way. If there is an easy way , it will not be the real dictionary writing.3) What is the first step in making a dictionary?The task of writing a dictionary begins with reading huge amounts of the literature of the period of subject that the dictionary is to cover.4) do editors copy on cards as they read?As the editors read, they copy on cards every words in their ordinary uses, and also the sentences in which each of these words appears.5)what do they do after millions of cards are collected?As the cards are collected, they are arranged in alphabetical order.6)how many sentences are usually collected to illustrate a word?There will be for each word anywhere from two or three to several hundred sentences that illustrate the meaning and use ofa word.7)what rule does the editor follow when he writes definitions? What should he not do ?The editor follows the hard_and _fast rule that each definition must be based on what the sentences in front of him show about the meaning of the word.The editor cannot be influenced by what he thinks a given word ought to mean.8)how does the author define dictionary writing ? what is a dictionary writer according to the author? And what is he or she not?The writing of a dictionary is not a task of setting up ruling statements about the “true meanings”of words, but a task of recording, to the best of one’s ability, what various words have meant to authors in the distant or immediate past.The writer of a dictionary is a historian, not a lawgiver.9)Why is it wrong to regard the dictionary as an “authority”?To regard the dictionary as an “authority” is to look upon the dictionary writer as being able to see into the future, which neither he nor anyone else can do.10)Why should we not be bound by the dictionary in choosing our words?We should not be bound by the dictionary because new situations, new experiences, new inventions, new feelings are always making us give new uses to old words.11)What dictionary do you usually use? Do you think it a good one? Why/why not?I usually use the oxford English Dictionary. I think it a good one because it has a lot of meanings in it, and each word is given Chinese meanings and English interpretations.12) what do you think you can learn from the text about learning a foreign language? What have you learned?We should not regard the dictionary as an authority. Weshould not be bound by the dictionary as each word is changing with the times.。
高中英语人教版选修8知识研习Unit5重点单词---interrupt
⾼中英语⼈教版选修8知识研习Unit5重点单词---interrupt interrupt vi.打断……的讲话；妨碍 vt. 暂时中断或中⽌归纳拓展(1)interrupt sb./sth.with sth.⽤……打断某⼈的讲话/某事物的进⾏(2)interruption n. 打扰，打断，中断without interruption 连续地；不间断地(3)cut/break into...打断，插话put... in插嘴说(后接插⼊说的内容)例句They interrupted her speech with jeering.他们的嘲笑打断了她的讲话。
We interrupt this programme to bring you a news flash.我们中断节⽬，报告新闻快讯。
Don't interrupt the speaker now，he will answer questions later.现在不要打断演讲者的话，他稍后再回答问题。
While the boys were discussing the car accident，Ben put in that the road was icy.男孩⼦们正在讨论车祸时，本插嘴说路滑。
同类辨析disturb与interrupt(1)disturb v. 打扰，妨碍(别⼈做事)；弄乱，搞乱；使焦虑，不安。
指使⼈不能平静或妨碍别⼈⼯作、思维或正常秩序，是程度较深的烦恼。
(2)interrupt 强调“(事情)突然中断；打断他⼈的⾔语或⾏为”之意，使其不能继续做某事。
【链接训练】Be quiet！It's rude to ______ people when they are talking.A．stop B．introduce C．prevent D．interrupt【解析】 根据“Be quiet”可知该句的语境是有⼈谈话时，另外的⼈在不停地打断。
人教新课标高二英语选修八教案：Unit5+Meeting+your+ancestors+interrupt+assume等重点单词精析.doc
interrupt, assume等重点单词精析1. 【课文原句】I’m sorry to interrupt you but how could they live here? (P38)【点拨】interrupt vt. 打断，打扰，中断，阻碍。
【例句】His speech was constantly interrupted by applause. 他的讲话不时被掌声打断。
She interrupted me to ask a question. 她打断我的话，问了我一个问题。
The floods interrupted railway services. 洪水使铁路运输中断。
【拓展】disturb意为“打扰，扰乱，使不安”，多用于被动语态，指程度较深的烦恼，甚至心理方面的失常；bother意为“打扰，麻烦，费心”，常指暂时的、无关紧要的困扰，在主动语态中，bother有“有意打扰”的含义；interrupt意为“打断，使中断”。
如：The child continually disturbed the class. 这个孩子不断地扰乱课堂秩序。
Emotionally disturbed children need special care and treatment. 情感失调的孩子需要特别的关怀和治疗。
I’m sorry to bother you, but can you tell me the time? 对不起，打扰你了，请问几点了？It is very impolite to interrupt a speaker. 打断别人的讲话很不礼貌。
He interrupted his work to answer the question. 他中断了自己的工作来回答问题。
2. 【课文原句】So we think it is reasonable to assume they lived in these caves ... (P38)【点拨】assume vt. 设想，承担，装作。
沪教牛津版英语八年级上册全套教学案【含答案】
2015-2016沪教牛津版初中英语八年级上册全套教学案Content第一讲 (2)Unit1 Language points (2)第二讲 (9)Grammar-不定代词 (9)第三讲 (13)Unit2 Language points (13)第四讲 (27)Grammar-数词 (27)第五讲 (35)Unit3 Language points (35)第六讲 (46)Grammar-形容词和副词 (46)第七讲 (56)Unit4 Language points (56)第八讲 (70)Grammar-形容词副词同级比较 (70)第九讲 (76)Unit5 Language points (76)第十讲 (89)Grammar-现在完成时 (89)第十一讲 (97)Unit6 Language points (97)第十二讲 (108)Grammar-现在完成时补充 (108)第十三讲 (116)Unit7 Language points (116)第十四讲 (128)Grammar-if条件状语从句 (128)第十五讲 (133)Unit8 Language points (133)第十六讲 (138)Grammar-情态动词 (138)优乐单元测 (144)V ocabulary (230)八年级上册英语教案资料第一讲Unit1◆知识探究1.Is my encyclopaedia useful, Lo?1)useful: 有用的，有益的，有帮助的 a useful book2)use +ful= useful 名词+ful= 形容词3)以-ful结尾的形容词的反义词多是相应的以-less结尾的形容词。
eg: useful--useless careful--careless helpful--helpless2.Leonardo da Vinci was an Italian painter, inventor, musician,engineer and scientist.动词后加后缀-er/ -or构成一种职业。
【英语二基础精讲】第六课 (1)
英语（二）（课程代码：00015）付志宽Alex如何快速理解英语句子意群1. 定义意群就是指句子中按意思和结构划分出的各个成分，每一个成分即称为一个意群。
2. 如何划分意群词组、介词、连词、不定式、分词、从句引导词Running: Sport or Way of Life?You go through the channels several times and find that once again there's nothing on TV that interests you. Not a problem! Just put on some running shoes and comfortable clothes and go for a run.One of the best things about the sport of running is that you don't need expensive equipment. All you need is a good pair of running shoes and a safe environment. But don't be fooled into thinking the sport of running is easy. It requires discipline and concentration.Running is good for you both physically and mentally. It strengthens your heart, lungs, and muscles. It makes you more aware of your body. Running also improves your body so that you don't get sick as easily. It can even help you to stay more focused in school because exercise helps you to think more clearly.How do you get engaged in the sport if you don't know much about it? Most schools offer running programs. A simple internet search can help you find some in your area. The programs show you how running can offer competition or just be for fun. They also teach runners to set practical goals and take care of their bodies. Runners have great respect for each other because they know how difficult the sport can be. If you go to a race, you'll see people cheering for all the runners. Running isn't always about how fast you are or how far you're going. It's about getting out there and doing it. Participation is more important than competition, and effort is recognized over talent.If you're looking for more than just a sport, running may be the perfect choice for you.You go through the channels several times and find that once again there's nothing on TV that interests you. Not a problem! Just put on some running shoes and comfortable clothes and go for a run. go through 查阅channel['tʃæn(ə)l] n 电视频道go through 通读；查阅If you go through a list, story, or plan, you read or check it from beginning to end.“You go through the channels several times and find that once again there's nothing on TV that interests you. ”Paragraph 1 意群分析You go through the channels several times∣and find ∣ that once again there's nothing on TV ∣ that interests you. ∣ Not a problem! ∣ Just put on some running shoes ∣ and comfortable clothes ∣ and go ∣ for a run. go through 查阅channel['tʃæn(ə)l] n 电视频道Paragraph 1 参考译文你一遍又一遍地切换电视频道，然后再次发现没什么电视节目能吸引你。
Unit 06 素材文档说课讲解
U n i t06素材文档College English Creative Reading3 跨文化交际英语·阅读教程 3Unit 6 NetiquetteNote on the TopicLearning Objectives1.Gain a full comprehension of the way how the Internet hasbecome a dominant means of communication, replacing thewritten letter and even the telephone;2.Reflect on how effectively and politely you communicate via emailand think about some dos and don’ts relating to email protocol and clarity;3.Express agreement or disagreement using conversational gambitsand respond to a passage by creating statements abouttelecommunication using alliteration.Before You Read1.Watch the following video and discuss the following questions witha partner.2.Discuss the following questions with a partner.1.In the first scene, what’s the man’s auto-response?I'll be on vacation from Tuesday, June 27th until 2 days ago.2. What does ASAP mean?As soon as possible.3. What’s Tripp Crosby’s job title?Regional Sales Manager.4. In the Email, w hat video does the man’s mother ask him to watch? The video of a cat sleeping on a horse.5. What’s your opinion on the email Johnson Emmanuel wrote to Tripp, in which he said he would be the next heir to the throne in Nigeria and wanted to offer him a large sum of money? Is it true?It is a phishing scam.ReadingSaying the Right Things in EmailsEmail is one of the fastest, most convenient and cheapest means of communication in the world —but that doesn’t mean that it’s the easiest to get right. In fact, it can be quite difficult to achieve appropriate tone (polite or intimate) and style (formal or informal) in an email. This difficulty is caused by the fact that emails have some of the features of written language and some of the features of the spoken form.Key words:tone: the way voice goes up and down as a person speaksintimate: relating to very private or personal things参考译文：电子邮件是现有的最快、最便捷也是最便宜的通讯方式之一。
单片机学习第六课--Interrupt
同一优先级中的中断申请不止一个时， 同一优先级中的中断申请不止一个时，则有中 断优先权排队问题。同一优先级的中断优先权排队， 断优先权排队问题。同一优先级的中断优先权排队， 由中断系统硬件确定的自然优先级形成， 由中断系统硬件确定的自然优先级形成，其排列如 所示： 所示：
3/5/2011
4、TF1（TCON.7），片内定时/计数器T1 TF1（TCON.7），片内定时/计数器T1 ），片内定时 溢出中断请求标志。当定时/计数器T1 T1发生 溢出中断请求标志。当定时/计数器T1发生 溢出时，置位TF1，并向CPU申请中断。 溢出时，置位TF1，并向CPU申请中断。 TF1 CPU申请中断
3/5/2011 5
二、80C51中断系统的结构 80C51中断系统的结构
80C51的中断系统有5个中断源 80C51的中断系统有5个中断源（8052有 6 的中断系统有 个） ，2个优先级，可实现二级中断嵌套 。 个优先级，
3/5/2011C51的中断源
一、中断源
3/5/2011 16
而80C52单片机有四个中断优先级，即可实现四级 80C52单片机有四个中断优先级， 单片机有四个中断优先级 中断服务嵌套。 中断服务嵌套。每个中断源的中断优先级由中断优 先级寄存器IP IPH中的相应位的状态来规定的 IP和 先级寄存器IP和IPH中的相应位的状态来规定的 。
3/5/2011 8
(P3 可由IT (TCON. IT1 2 、 (P3.3 ） 。 可由 IT1(TCON.2) 选择其为低电 平有效还是下降沿有效。 CPU检测到 检测到P 平有效还是下降沿有效 。 当 CPU 检测到 P3.3 引脚 上出现有效的中断信号时，中断标志 IE1(TCON. CPU申请中断 申请中断。 IE1(TCON.3)置1,向CPU申请中断。
Lesson6
Lesson6Lesson 6 Percy Buttons课文内容：I have just moved to a house in Bridge Street. Yesterday a beggar knocked at my door. He asked me for a meal and a glass of beer. In return for this, the beggar stood on his head and sang songs. I gave him a meal. He ate the food and drank the beer. Then he put a piece of cheese in his pocket and went away. Later a neighbour told me about him. Everybody knows him. His name is Percy Buttons. He calls at every house in the street once a month and always asks for a meal and a glass of beer.Notes on the text课文注释1 He asked me for a meal and a glass of beer. 他问我要一顿饭和一杯啤酒。
ask sb. for sth. , 向某人索要某物。
2 in return for this, 作为报答，句中this指上文的a meal and a glass of beer。
3 stand on one's head, 倒立。
4 He calls at every house in the street. 他光顾街上的每一幢房子。
参考译文我刚刚搬进了大桥街的一所房子。
昨天一个乞丐来敲我的门，问我要一顿饭和一杯啤酒。
Lesson6_Percy_Buttons_新概念二册
6.
Two boys will go to the zoo, and_________ will stay at home. 7. Put it in your________ hand. 8. He has two daughters. One is a nurse, _______is a worker. 9.On _______side of the street ， there is a tall tree. 1 0 . M a r y is much taller than_________ girls.
Exercise on page 34
1. He did not know how to fight, but he out knocked the boxer______.
2. This flowerpot is broken. Who over it _______? knocked
off 3. I knocked ______early yesterday and went to the football match.
2. At what time do you finish work every day?
= At what time do you knock off every day?
I have just moved to a house in Bridge Street. move vt. 移动，感动 vi.移动，迁移，搬家 表示“搬家”的概念，后面可接to, into, out和in: Lucy has moved out and Lily will move in soon.
Have you ever seen a beggar singing while he is standing on
(教学指导)UNIT6SectionⅡ教学知识细解码Word版含解析
1．independent adj.独立的，自主的→independence n．独立2．impress v t.使印象深刻；使铭记→impressive adj.令人钦佩的，给人印象深刻的→impression n．印象3．aware adj.知道的，意识到的→awareness n．认识；意识4．move v t.移动；前进→movement n．运动，动作，活动5．depress v t.使沮丧；使消沉→depressed adj.意志消沉的；沮丧的→depression n．忧郁，沮丧，消沉；抑郁症6．commit v t.做出(错或非法的事)；犯(罪或错等)；自杀；承诺，保证(做某事、遵守协议或遵从安排等) →commitment n．投入，忠诚，奉献；承诺7．engage v i.参加，参与→engaged adj.使用中的；被占用的→engagement n．雇用；预约8．energy n．精力；活力→energetic adj.精力充沛的，充满活力的9．disable v t.使丧失能力；使伤残→disabled adj.残疾的；伤残的→disability n．伤残，残障，障碍10．inspire v t.激励；鼓舞→inspiring adj.激励的；鼓舞人心的→inspiration n．给人鼓舞；灵感strike vt.撞击；击打；攻击；侵袭，爆发；突然想起；划火柴；敲(钟) n．罢工①The child ran into the road and was struck by a car.撞击②He struck the table with his fist.击打③Police fear that the killer may strike again.攻击④The area was struck by an outbreak of cholera.侵袭⑤It suddenly struck me how we could improve the situation.突然想起⑥The matches were damp and he couldn't make them strike.划火柴⑦The clock has just struck three.敲⑧Air traffic controllers are threatening to come out on/go on strike.罢工Words and Phrases知识要点1inspiring adj.鼓舞人心的；激动的；启发灵感的(教材P56)He gave a famous and inspiring started with the words “I have a dream”．他发表了一篇“我有一个梦想”的著名而鼓舞人心的演讲。
高一英语Unit 6 Good manners一周强化新人教版
Unit 6 Good manners一周强化一、本单元重点单词1．interrupt vt. & vi. 打断；中断；插嘴Traffic was interrupted by a snowstorm.交通被暴风雪所阻断。
Don’t interrupt me while I'm speaking!我讲话时，不要打断！Trade between the two countries was interrupted by the war.两国间的贸易因战争而中断。
辨析：interrupt/bother/disturbinterrupt 意为“打断，中断；插嘴〞，指停顿或中断正在进展的事物，重在强调“断〞。
bother 意为打扰；扰乱〞，重在强调“扰〞。
disturb 也可作“打扰〔某人〕〞，但重在强调破坏宁静或平静的自然的局面。
Traffic was interrupted by floods.交通被洪水阻断。
〔阻断〕His bad leg is bothering him again.他的那条伤腿又在痛了。
〔打扰某人bother sb.〕Don’t bother yourself about me.别为我操心。
A light wind disturbed the surface of the water.微风弄皱水面。
〔不可用bother〕Anyone who disturbs the peace should be punished.任何扰乱治安的人应该严惩。
［disturb the peace 扰乱治安〔固定搭配〕］Don’t disturb yourself one my matter.别因为我而给你添麻烦。
〔可用bother〕2．apologize vi.道歉，谢罪〔BrE〕=apologise (AmE)主要搭配：〔1〕apologize to sb. 向某人道歉／谢罪I must apologize to you.我必须向你道歉。
【英语二基础精讲】第六课 (1)
英语（二）（课程代码：00015）付志宽Alex如何快速理解英语句子意群1. 定义意群就是指句子中按意思和结构划分出的各个成分，每一个成分即称为一个意群。
2. 如何划分意群词组、介词、连词、不定式、分词、从句引导词Running: Sport or Way of Life?You go through the channels several times and find that once again there's nothing on TV that interests you. Not a problem! Just put on some running shoes and comfortable clothes and go for a run.One of the best things about the sport of running is that you don't need expensive equipment. All you need is a good pair of running shoes and a safe environment. But don't be fooled into thinking the sport of running is easy. It requires discipline and concentration.Running is good for you both physically and mentally. It strengthens your heart, lungs, and muscles. It makes you more aware of your body. Running also improves your body so that you don't get sick as easily. It can even help you to stay more focused in school because exercise helps you to think more clearly.How do you get engaged in the sport if you don't know much about it? Most schools offer running programs. A simple internet search can help you find some in your area. The programs show you how running can offer competition or just be for fun. They also teach runners to set practical goals and take care of their bodies. Runners have great respect for each other because they know how difficult the sport can be. If you go to a race, you'll see people cheering for all the runners. Running isn't always about how fast you are or how far you're going. It's about getting out there and doing it. Participation is more important than competition, and effort is recognized over talent.If you're looking for more than just a sport, running may be the perfect choice for you.You go through the channels several times and find that once again there's nothing on TV that interests you. Not a problem! Just put on some running shoes and comfortable clothes and go for a run. go through 查阅channel['tʃæn(ə)l] n 电视频道go through 通读；查阅If you go through a list, story, or plan, you read or check it from beginning to end.“You go through the channels several times and find that once again there's nothing on TV that interests you. ”Paragraph 1 意群分析You go through the channels several times∣and find ∣ that once again there's nothing on TV ∣ that interests you. ∣ Not a problem! ∣ Just put on some running shoes ∣ and comfortable clothes ∣ and go ∣ for a run. go through 查阅channel['tʃæn(ə)l] n 电视频道Paragraph 1 参考译文你一遍又一遍地切换电视频道，然后再次发现没什么电视节目能吸引你。
第六课课文详解
Lesson 6 The Man in the WaterPlane Crash into PotomacOn this day in 1982, an Air Florida Boeing 727 plunges into the Potomac River in Washington, D.C., killing 78 people. The crash, caused by bad weather, took place only two miles from the White House.The Air Florida flight took off from Washington National Airport in Arlington, Virginia, with 74 passengers and 5 crew members on board. The plane had flown into Washington from Miami in the early afternoon and was supposed to return to Ft. Lauderdale, Florida, after a short stop. However, snow in Washington temporarily closed the airport. When it reopened, the plane was de-iced with chemical anti-freeze, but the plane still had difficulty moving away from the gate due to the ice. When it eventually made i t to the airport’s only usable runway, it was forced to wait 45 minutes for clearance to take off.Not wanting to further delay the flight, the pilot, Larry Wheaton, did not return for more de-icing, and worse, failed to turn on the plane’s own de-icing system. In fact, the pilot and co-pilot discussed the situation, and the co-pilot said "It’s a losing battle trying to de-ice these things. It gives you a false sense of security, that’s all it does." During the delay, however, ice was accumulating on the wings, and by the time the plane reached the end of the runway, it was able to achieve only a few hundred feet of altitude.Thirty seconds later, the plane crashed into the 14th Street Bridge over the Potomac River, less than a mile away from the runway. Seven vehicles traveling on the bridge were struck by the 727 and the plane fell into the freezing water. It was later determined that 73 of the people on board the plane died from the impact, leaving only six survivors in the river. In addition, four motorists died in the crash.Terrible traffic in Washington that day made it difficult for rescue workers to reach the scene. Witnesses didn’t know what to do to assist the survivors who were stuck in the freezing river. Finally, a police helicopter arrived and began assisting the survivors in a very risky operation.Two people in particular emerged as heroes during the rescue: Arland Williams and Lenny Skutnik. Known as the "sixth passenger," Williams survived the crash, and passed lifelines on to others rather than take one for himself. He ended up being the only plane passenger to die from drowning. When one of the survivors to whom Williams had passed a lifeline was unable to hold on to it, Skutnik, who was watching the unfolding tragedy, jumped into the water and swam to rescue her. Both Skutnik and Williams (along with bystander Roger Olian) received the Coast Guard Gold Lifesaving Medal. The bridge was later renamed the Arland D. Williams Jr. Memorial Bridge.I In troduction to the TextThis is a short essay about an air crash that took place in the capital of the United States in the year 1982. a plane that tool off from the Washington National Airport did not clear the bridge over the Potomac River because of the thick on the wings. It hit the gridge and fell right into the river, bringing all the passangers to their instant death except five from the tail sction who found themselves grasing and struggling in the icy water. These five people however survived, and they were able to survive because of four heroes. The author wrote this essay in praise of these heroes, three of whom had risked their lives to rescue the survivors and were able to live to tell the story, but the man that really held the whole nation’s attention was the fourth man who had kept pushinghis lifeline救生索and flotation rings救生圈to others until he went under.Heroism of course has always been admired. But this man’s heroism was unusual. People usually expect revolutionaries to die martyrs; they also expect true believers to be willing to die for their faith; they might also expect some people to be ready to lay down their lives in performing their duty; they also believe that many people would show courage in their attempt to win power, influence, money or to save their loved ones. But this man in the water did not fit in any of these descriptions. He did not have to give his rings to others; he did not even know these people; and he died anonymous, unidentified. He was extraordinary precisely because he was ordinary. He shoued what everyone of us could do. The display of his heroism was a song to the beautiful human character. In our world today, we do not have to be reminded that there are a lot of displayss of human weakness. But it is this kind of true story that reminds us that we have no reason to be pessimistic or cynical.The fact that this hero happened to be an American should not bother us. When people talk about the American character, they sometimes go to an extreme. But blind hatred is just as wrong as blind worship. The United States has their share of human trash垃圾of course, but they also have numerous decent, honest, brave people like the one in the water who have made their country what it is today. And it is this side of their national character we should learn from.II Detailed Discussion of the Text1.As disaster go, this one was terrible, but not unique, certainly not among the worst U.S.air crashes on record.Air crashes usually involve a heavy loss of lives. Comapred with other air crashes, this one was not the worst. This air crash was remembered for a different reason.as disasters go: compared with the average disaster of this type.More examples of the use of “as something goes”:As writers go, Oscar Wilde was not the most talented. But he was among the most popullar.As businessmen go, he is considered pretty honest.2.There was the unusual element of the bridge , of course, and the fact that the plane hit it at amoment of high traffic.One thing that was unusual about this disaster was that the plane hit the bridge.“Element” here means “factor”.high traffic: heavy traffic; heavy flow of vehicles along the road3.Washington, the city of form and rules, turned chaotic by a blast of real winter and a singleslap of metal on metal.the city of form and rules: See Note in Notes to the Text.turned chaotic: became chaotic; was thrown into a terrible confusiona blast of real winter: a sudden strong really could windThe word”blast” could also refer to a sudden explosion or a sudden very loud noise, e.g.The human-bomb exploded and more than 20 people were killed in the terrible blast.The music came in full blast form the next door, and I had to call the police to stop it.slap: a quick blow with something flat as in “a slap across the face”. Here of course it is used figuratively.4.presidential monumentsSee Note 3 in Notes to the Text.5.And there was the aesthetic clash as well---blue-and-green Air Florida, … sunk down amonggray chunks of ice in a black river.When the air crash occurred, it was not just a clash (a loud sound made by two objects) of metal against the bridge, but also a clash between colors: the blue-green color of the plane and the gray and black color of the ice and river.the aestheitc clash:the combination of different colors which look very bad (“aesthetic”: something connected with the study of beauty)Air Florida: The Florida Airlline. Also: Air France; Air Japan (JAL)chunk: a fairly large amount of, e.g.a chunk of meat; a chunk of rice6.Still, there was nothing very special in any of it, except death, which, while always special,does not necessarily bring millions to tears or to attention.while aways special: although (it is) always special, e.g.Money, while desirable and useful, can corrupt.Their life, while rich and comfortable, somehow lacks meaning.not necessarily: possibly but not certainly, e.g.New things are not necessarily better.Teachers do not necessarily know more than students sometimes.bring millions to tears or to attention:make millions cry or attract millions of people’s attention7.Why, then, the shock here?(1)Why was there such a shock here?Notice the structure of this kind of elliptical sentence, e.g.Five o’clock? Why so early?To go to Afghanistan? Wy me?If so many businesses can’t compete with other countries, why WTO then?8. a mechanical failureWe are talking about the cause of the disaster there: whether it is a mechanical problem or a human error.9.Here, after all, were two forms of nature in collision: the elements and human character.the elements: the bad weatherthe two forms of nature: the bad weather and the human character. Both are forms of natural power.collision:clash; two people or vehicles or ideas hitting each other while moving directly toward each otherNote: Do not mix up with the word “coalition”.st Wednesday, the elements, indifferent as ever, brought down Flight 90. And on that sameafternoon, human nature---groping and struggling ---rose to the occasion.(2)indifferent as ever: unconcerned about the consequences as alwaysbrought down: made the plane fall downNotice the difference between these sentences:A.The plane fell into the river.They brought down an enemy plane by bulletsB.He grew up in a small mountain village.He was brought up by his siter-in-law.C.The fire went out after two weeks.The fire was brought under control in the end.flight: It refers to a plane making a particular journey.rise to the occasion: to deal successfully with a dificult situation or problem, e.g.I’m sure that he will rise to the occasion when he realizes what is at stake.groping and struggling: groping for the flotation rings and struggling in the icy waterBut these two words may also be interpreted figuratively, referring to human nature.11.Of the four acknowledged heroes of the event, three are able to account for their behavior.Only three out of these four heroes lived to tell people what they actually had done nand now they had rescued the five survivors.account for: to give a satisfactory explanation of what has happened.12.Donald Usher … a park police helicopter team, risked their lives every time they dipped intothe water to pick up survivors.park police: police whose job it is to look after a park.every time: whenever13.… they described their courage as all in the line of duty.in the line of duty: as part of one’s duty, e.g.They are paid by the people to provide these services. It’s all in the line of duty.14.“It’s something I never thought I would do.”“I never thought I would have the courage to jump into th eicy water to rescue somebody.”“It” here refers to his heroic deed.15.…delivering every hero’s line that is no less admirable for being repeated.… saying something that has been said before by many people in similar situations, but it is still admirable.deliver a line: to make a remark. Also: to deliver a pseech; to deliver a lecture16.That somebody actually did so is part of the reason this particular tragedy sticks in themind.(3)English, we usually turn them into appositive clauses byadding the word “fact”. For example: The fact that somebody actually did so is part of the reason this particular tragedy sticks in the mind.stick in the mind: to be remembered17.… responsible for the emotional impact of the disaster(4)being the reason for the emotional impact of the disasteremotional impact of the disaster: how this disaster has moved peoplebe responsible for: to be the cause for, e.g.That policy was largely responsible for the mass hunger.The favorable weather conditions were partly responsible for our good harvest last year.18.This man was escribed … as appearing alert and in control.This man was described as a person who appeared alert andin control.alert and in control:able to think quickly and clearly; calm and with perfect presence of mind, e.g.although she is almost ninety, she still has an alert mind.19.Every time they lowered a lifeline and flotation ring to him, he passed it on to another of thepassengers.lifeline: a rope used to rescue people at seaflotation ring: some kind of life-belt or life-preserver20.“In a mass casualty, you’ll find people like him. But I’ve never seen one with thatcommitment.”We can always find hieroc people like him in a mass casualty because although not everyone is a hero, there’s bound to be a fair representation of heroes in a big crowd.mass casualty: large numbers of people hurt or killed in an accident or battle“Mass” here is an adjective as in mass murder, mass audiences, mass protest, etc.commitent: Here: a strong sense of reponsibility or loyaltyNotice how the word “commit” and its derivatives are used:WTO commits China to give national treatment to all foreign business people.China is commited to lower its tariffs.We have a strong commitment to follow WTO rules.21.When the helicopter came back for him theman had gone under.go under: to sink; to be drwoned, e.g.In a fierce competition, these oiirly managed enterprises will go under.In case of an economic recession, these old and weak people will be the first to go under.The captain hoped that help would come before the ship went under.22.His selflessness was one reason the story held national attention; his anonymity another.The fact that the man in the water who had displayed such heroism did not leave his name and no one was ever able to find it out was another reason why the whole nation felt so touched by this story. It showed that the man was a very ordinary citizen. It also proved that he did what he did not for fame or anythign.anonymity: the state of being unknown by nameanonymous: (adj.)He preferred to remain anonymous.The author of this book is anonymous.Note how the anonymity is formed. An-means without, and nym comes form anoma in late Laitn which means name.CF: antonym, synonym, homonym, pseudonym23.The fact that he went unidentified gave him a universal character.gave him a universal character: gave him a universal quality; made him a representative man, like everyone of us could be; made people feel that it could have been anyone24.For a while he was Everyman, and thus proof (as if one needed it) that no man is ordianry.Notice that the word “Everyman” is captialized. It echoes the title of a medieval play about a typical human being. It conveys the idea that this anonymous man really represents the best of numan nature. What he did was not the act of a supernatural being, but the act of an ordianry person. Yet, the author says here that “no man is ordinary”, because every person is an individual moral eitity and is capable of rising to the occasion and making history.25.Still, he could never have imagined such a capacity in himself.(5)However, it was impossible for him to know that he would be capable of such heroism.What the man did was the natural response to the cirtical situation.Notice the use of the word “in” here. It is used to say what one should consider in an other.More examples:We all see a promising scholar in her.I don’t know what she saw in that man. He seemed to be very common. But she lovedhim.26.Only minutes before his character was tested, he was sitting …,listening to the stewardesstelling him to fasten his seat belt and saying something about …The author is imaging what must have been the situation. He used the past continuous to make the narration more real and vivid.stewardess:“-ess” is a noun sufix referring to t female, e.g.waitress, actress, mistress, hostess, lioness, countess27.So our man relaxed with the others, some of whom would owe their lives to him.our man: our hero, the man we are talking about hereof whom: Notice that here only “whom” can be used, not “that” or “who”.owe: We can say “I owe him five dollars” or “I owe five dollars to him”. Similarly:We can say “He brought me a dictionary” or “He bought a dictionary for me”, “It costs us a lot of money” or “It costs a lot of money to us”.28.…or to regret some harsh remark made in the office that morning.… or to feel sorry for the unkind things he might have said to his employee in the office that morning before he took the plane.The author imagined the man to be some kind of business executive.29.Like every other person on the flight, he was desperate to live, which makes his final act sostunning.His last act was stunning because like everyone else, he also valued his life and was desperate to live.stunning: shockingon that fllight: on board that plane“Which” here stands for what has been stated before.30.For at some moment in the water he must have realized that he would not live if he continuedto hand over the rope and ring to others. He had to know it, no matter how slow with effect of the cold.(6)Obviously it requires much more courage to face sure death knowing that you have a choice (keep one of the rings for yourself) than to face the possibility of death by, for example, a stray bullet in battle. The man in the story did not act on impulse. He did not pass on his rings to others with a total unawareness of the consequences. At some point he must have known that he was freeaing to death and would go under any moment. But he still gave the chance for survival to the next person.no matter how slow the effect: however slow the effect of the cold might be31.Yet there was something else about our man that kept our thoughts on him, (7)that kept our thoughts on him: that held our attention to him; that made us think of him all the time32.He was there, in the essential, classic circumstance.What happened that day was a typical situation in which nature and man fought each other.And when nature begins to show its power, you always find man fighting back. He is alwaysthere. We can always expect to find such a hero.essential: basic, typical, the most importantclassic: very traditional or lang establlished33.So the age-old battle began again in the Potomac. For as long as that man could last, theywent at each other, nature and man…the age-old battle between nature and man: the author is using a very traditional idea here, the idea that huma civilized is a record of man’s gradual conquest of nature.go at: to attack; to start to fight, e.g.Those companies went at eachi other like hungry wolves.34.…the one making no distinctions of good and evil, acting on no principles offering nollifelines, the other acting wholly on distinctions, principles and perhaps, on faith.Nature is indifferent. It does not have any idea what is good or what is bad for human beings, and it does not care. It has no moral principles. Human beings, on the other hand, are different.They have moral standards. They have feelings. They care and they love. Therefore they are able to choose between right and wrong.35.In reality, we believe the opposite, and it takes the act of theman in the water to remind us ofour true feelings in this matter.(8)Actually, the death of the man did not mean that human beings had lost the battle. In moral sense, man had won, because man’s courage to defy death was also a trementdous power.Therefore what happened to this man in the water should fill us with pride rather than sadness.36.It is not to say that everyone would have acted as he did (8)It is not to say: It does not mean37.Yet whatever moved these mento challenge death on behalf of their fellows is not peculiar tothem. Everyone feels the possibility in himself.Yet whatever enabled or made these men or gave these men the power to challenge death is not unique. Indeed, every one of us has the potentiality to be a hero.38.That is the enduring wonder of the story. That is why we would not let go of it.That is the lasting wonder of the story. That is what keeps our thoughts on this story. (That is why we keep thinking about this story. Thatis why this story will always livein our memory.) go of it39.If the man in the water gave a lifeline to the people gasping for survival, he was likewisegiving a lifeline to those who watched him.In this article, the author is giving the man’s action a symbolic meaning. When the man was giving a lifeline to the people gasping for survival, we might say that he was also giving the chance to live to everyone of us. He was showing by his own example the neaning of life, the dignity of human existence, the power of nobe human character.likewise: in the same way40.“Everything in Nature containshe powers of nature,” said Emerson.(9)For Emerson, see Note 11 in Notes to the Text.By “the powers of nature”, Emerson did not just mean such powers as coming from coal, oil, water,wind, etc. (He could haveincluded nuclear power if he had been able to see that far into the future.) He probably also meant the power unique to human beings: the power to love, the power to change, and the power to create.41.The man in the water set himself against an immovable, impersonal enemy; he fought it withkindness; and he held it to a standoff. He was the best we can do.set sb. against sb.: to make sb. start to fight or quarrel with another person, esp. a person with whom they had friendly relations before. e.g.There were outside forces who were trying to set one tribe against another. That was why there were endless civil wars in the country.I’m not going to set myself against my own classmates.An immovable, impersonal enemy: It refers to nature, which is indifferent and cannot be persuaded to change its attitude towards us humans. “Immovable” here means “impossible to be changed or persuaded”.standoff: a situation in which neither side in a fight or battle can gain an advantage.He was the best we can do: The man in the water represented human nature at its best.III Translation of Text A“水中人”就灾难而言，这一次很可怕，但不是前所未有，当然更算不上美国空难史中最惨烈的一场。
高中英语单词天天记interrupt素材
· interrupt· v. [͵ɪntə'rʌpt] ( interrupts; interrupted; interrupting )·· 双解释义· vt. & vi.打断stop by breaking in· 基本要点•1.interrupt的基本意思是“打断(谈话)”“打扰”,指由于某种外界因素而停下来,或为了某种目的而停下来,但不表明这种停止是否会继续下去。
interrupt还可引申作“遮挡(视线或某物)”“使不连贯”解。
2.interrupt可用作及物动词,也可用作不及物动词。
用作及物动词时,接名词或代词作宾语。
•· 词汇搭配•interrupt the path 阻断道路•interrupt sb's speech 打断某人讲话•interrupt traffic 中断交通•interrupt the view 遮住视线•interrupt abruptly 突然地打断•interrupt constantly 不时地打断•interrupt earnestly 认真地打断•interrupt frequently 频繁地打断•interrupt rudely 粗鲁地打断•interrupt temporarily 暂时打断•interrupt vaguely 含糊地打断•be interrupted by 被…打断〔阻断〕•interrupt sb in his talk 打断某人的话•interrupt with 打断· 常用短语•interrupt in(v.+prep.)打断; 打扰; 中断 break the continuity of; break in on a person speaking▲interrupt sb/oneself in sthThe noise interrupted us in our conversation.噪音打断了我们的谈话。
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
遇以下任一条件，硬件将受阻，不产生LCALL指令： CPU正在处理同级或高优先级中断； 当前查询的机器周期不是所执行指令的最后一个机 器周期。即在完成所执行指令前，不会响应中断，从 而保证指令在执行过程中不被打断； 正在执行的指令为RET、RETI或任何访问IE或IP寄 存器的指令。即只有在这些指令后面至少再执行一条 指令时才能接受中断请求。 若由于上述条件的阻碍中断未能得到响应，当条件 消失时该中断标志却已不再有效，那么该中断将不被 响应。就是说，中断标志曾经有效，但未获响应，查 询过程在下个机器周期将重新进行。
（IP.4），串行口优先级设定位； PT2 (IP.5) ，定时/计数器T2优先级设定位。
PS
2015/9/3 16
而80C52单片机有四个中断优先级，即可实现四级 中断服务嵌套。每个中断源的中断优先级由中断优 先级寄存器IP和IPH中的相应位的状态来规定的 。
PX0（IPH.0），外部中断0优先级设定位；
低 级
RI TI
ES 1 ≥1
PS 1 0
中断入口
SCON
2 、 (P3.3 ）。可由 IT1(TCON.2) 选择其为低电 平有效还是下降沿有效。当 CPU 检测到 P3.3 引脚 上出现有效的中断信号时，中断标志 IE1(TCON.3) 置1,向CPU申请中断。
2015/9/3 9
TCON
IT0 1 0 IE0 1 ET0 1 TF0 IT1 1 0 IE1 1 ET1 1 TF1 EX0 1
5.2.2
中断响应过程
将相应的优先级状态触发器置1（以阻断
后来的同级或低级的中断请求）。 执行一条硬件LCALL指令，即把程序计 数器PC的内容压入堆栈保存，再将相应的 中断服务程序的入口地址送入PC。 (P116) 执行中断服务程序。 中断响应过程的前两步是由中断系统内 部自动完成的，而中断服务程序则要由用 户编写程序来完成。
低 级
RI TI
ES 1 ≥1
PS 1 0
中断入口
SCON
4、TF1（TCON.7），片内定时/计数器T1 溢出中断请求标志。当定时/计数器T1发生 溢出时，置位TF1，并向CPU申请中断。
2015/9/3 11
TCON
IT0 1 0 IE0 1 ET0 1 TF0 IT1 1 0 IE1 1 ET1 1 TF1 EX0 1
IE
EA 1
IP
PX0 1 0 PT0 1 0 1
硬件查询
自 然 优 先 级 中断源 高 级
INT0 T0 INT1 T1 RX TX
中断入口
EX1 1
PX1 1 0 PT1 1 0 0 自 然 优 先 级 中断源
低 级
RI TI
ES 1 ≥1
PS 1 0
中断入口
SCON
5、RI（SCON.0）或TI（SCON.1），串行口 中断请求标志。当串行口接收完一帧串行数 据时置位RI或当串行口发送完一帧串行数据 时置位TI，向CPU申请中断。 2015/9/3
中断系统
2015/9/3
1
5.1 80C51的中断系统
5.1.1 80C51的中断系统结构
一、中断的概念 CPU在处理某一事件A时，发生了另一事件B请 求CPU迅速去处理（中断发生）； CPU暂时中断当前的工作，转去处理事件B（中 断响应和中断服务）； 待CPU将事件B处理完毕后，再回到原来事件A被 中断的地方继续处理事件A（中断返回），这一过 程称为中断 。
2015/9/3 10
TCON
IT0 1 0 IE0 1 ET0 1 TF0 IT1 1 0 IE1 1 ET1 1 TF1 EX0 1
IE
EA 1
IP
PX0 1 0 PT0 1 0 1
硬件查询
自 然 优 先 级 中断源 高 级
INT0 T0 INT1 T1 RX TX
中断入口
EX1 1
PX1 1 0 PT1 1 0 0 自 然 优 先 级 中断源
2015/9/3 4
……
响应
随着计算机技术的应用，人们发现中断技 术不仅解决了快速主机与慢速I/O设备的数据 传送问题，而且还具有如下优点： 分时操作。CPU可以分时为多个I/O设备 服务，提高了计算机的利用率；
实时响应。CPU能够及时处理应用系统的
随机事件，系统的实时性大大增强；
可靠性高。CPU具有处理设备故障及掉电
12
二、中断请求标志
1、TCON的中断标志
IT0（TCON.0），外部中断0触发方式控制位。 当IT0=0时，为电平触发方式。 当IT0=1时，为边沿触发方式（下降沿有效）。 IE0（TCON.1），外部中断0中断请求标志位。 IT1（TCON.2），外部中断1触发方式控制位。 IE1（TCON.3），外部中断1中断请求标志位。 TF0（TCON.5），定时/计数器T0溢出中断请求标志位。 TF1（TCON.7），定时/计数器T1溢出中断请求标志位。
2015/9/3 23
二、中断响应时间
5.2.1 响应时间--从查询中断请求标志位到转向中断 服务入口地址所需的机器周期数。 （1）最快响应时间 以外部中断的电平触发为最快。 从查询中断请求信号到中断服务程序需要三个机器周 期： 1个周期（查询）＋2个周期（长调用LCALL） （2）最长时间 若当前指令是RET、RETI和IP、IE指令，紧接着下一 条是乘除指令发生，则最长为8个周期： 2个周期执行当前指令（其中含有1个周期查询）＋4 个周期乘除指令＋2个周期长调用＝8个周期。 2015/9/3 24
硬件查询
自 然 优 先 级 中断源 高 级
INT0 T0 INT1 T1 RX TX
中断入口
EX1 1
PX1 1 0 PT1 1 0 0 自 然 优 先 级 中断源
低 级
RI TI
ES 1 ≥1
PS 1 0
中断入口
SCON
1 、（ P3.2 ）。可由 IT0(TCON.0) 选择其为低电 平有效还是下降沿有效。当 CPU 检测到 P3.2 引脚 上出现有效的中断信号时，中断标志IE0(TCON.1) 置1，向CPU申请中断。
2015/9/3
18
设置52单片机的4个中断源,使他们的优顺
序为T1,INT1,INT0,T0.
IPH = 0X08; IP = 0X40; PT1 = 1; PX1 = 1;
2015/9/3
19
80C51单片机的中断优先级有三条原则：
CPU同时接收到几个中断时，首先响应优先级别最
高的中断请求。 正在进行的中断过程不能被新的同级或低优先级的 中断请求所中断。 正在进行的低优先级中断服务，能被高优先级中断 请求所中断。
2015/9/3 2
MCS-51单片机的中断系统结构
主程序 中断响应
中断请求
执行主 程序
断点 继续执行 主程序 执行 中断 处理 程序
中断返回
3
2015/9/3
主程序A
断点
返回
RETI 中断服务程序B
引起CPU中断的根源，称为中断源。中断源向CPU提出 的中断请求。CPU暂时中断原来的事务A，转去处理事件B。 对事件B处理完毕后，再回到原来被中断的地方（即断点）， 称为中断返回。实现上述中断功能的部件称为中断系统（中 断机构）。
为了实现上述后两条原则，中断系统内部设有两 个用户不能寻址的优先级状态触发器。其中一个置1， 表示正在响应高优先级的中断，它将阻断后来所有 的中断请求；另一个置1，表示正在响应低优先级中 断，它将阻断后来所有的低优先级中断请求。
2015/9/3 20
5.2 80C51单片机中断处理过程
5.2.1
2015/9/3 13
2、SCON的中断标志
RI（SCON.0），串行口接收中断标志位。当允
许串行口接收数据时，每接收完一个串行帧，由 硬件置位RI。同样，RI必须由软件清除。 TI（SCON.1），串行口发送中断标志位。当 CPU将一个发送数据写入串行口发送缓冲器时， 就启动了发送过程。每发送完一个串行帧，由硬 件置位TI。CPU响应中断时，不能自动清除TI， TI必须由软件清除。
2015/9/3 8
TCON
IT0 1 0 IE0 1 ET0 1 TF0 IT1 1 0 IE1 1 ET1 1 TF1 EX0 1
IE
EA 1
IP
PX0 1 0 PT0 1 0 1
硬件查询
自 然 优 先 级 中断源 高 级
INT0 T0 INT1 T1 RX TX
中断入口
EX1 1
PX1 1 0 PT1 1 0 0 自 然 优 先 级 中断源
2015/9/3 14
5.1.3 80C51中断的控制
一、中断允许控制
CPU对中断系统所有中断以及某个中断源的开放和屏 蔽是由中断允许寄存器IE控制的。
EX0(IE.0)，外部中断0允许位； ET0(IE.1)，定时/计数器T0中断允许位； EX1(IE.2)，外部中断0允许位；
ET1(IE.3)，定时/计数器T1中断允许位；
ES（IE.4)，串行口中断允许位； EA
2015/9/3
(IE.7)， CPU中断允许（总允许）位。
15
二、中断优先级控制
80C51单片机有两个中断优先级，即可实现二级 中断服务嵌套。每个中断源的中断优先级都是由中断 优先级寄存器IP中的相应位的状态来规定的 。
PX0（IP.0），外部中断0优先级设定位； PT0（IP.1），定时/计数器T0优先级设定位； PX1（IP.2），外部中断0优先级设定位； PT1（IP.3），定时/计数器T1优先级设定位；
中断响应条件和时间
一、ห้องสมุดไป่ตู้断响应条件