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1、 本 科 生 畢 業(yè) 論 文〔外文翻譯〕 譯文名稱： MCS -51系列單片機(jī)的功能和結(jié)構(gòu) 專 業(yè)： 自動(dòng)化 班 次： 學(xué) 員： 指導(dǎo)教員： 評 閱 人： 完成時(shí)間：2021年11月30 日 Structure and function o

2、f the MCS-51 series Structure and function of the MCS-51 series one-chip computer is a name of a piece of one-chip computer series which Intel Company produces. This company introduced 8 top-grade one-chip computers of MCS-51 series in 1980 after introducing 8 one-chip computers of MCS-48 series

3、 in 1976. It belong to a lot of kinds this line of one-chip computer the chips have,such as 8051, 8031, 8751, 80C51BH, 80C31BH,etc., their basic composition, basic performance and instruction system are all the same. 8051 daily representatives- 51 serial one-chip computers . An one-chip compute

4、r system is made up of several following parts: ( 1) One microprocessor of 8 (CPU). ( 2) At slice data memory RAM (128B/256B),it use not depositting not can reading /data that write, such as result not middle of operation, final result and data wanted to show, etc. ( 3) Procedure memory ROM/EPROM (4

5、KB/8KB ), is used to preserve the procedure , some initial data and form in slice. But does not take ROM/EPROM within some one-chip computers, such as 8031 , 8032, 80C ,etc.. ( 4) Four 8 run side by side I/O interface P0 four P3, each mouth can use as introduction , may use as exporting too. ( 5) Tw

6、o timer / counter, each timer / counter may set up and count in the way, used to count to the external incident, can set up into a timing way too, and can according to count or result of timing realize the control of the computer. ( 6) Five cut off cutting off the control system of the source . ( 7)

7、 One all duplexing serial I/O mouth of UART (universal asynchronous receiver/transmitter (UART) ), is it realize one-chip computer or one-chip computer and serial communication of computer to use for. ( 8) Stretch oscillator and clock produce circuit, quartz crystal finely tune electric capacity nee

8、d outer. Allow oscillation frequency as 12 megahertas now at most. Every the above-mentioned part was joined through the inside data bus .Among them, CPU is a core of the one-chip computer, it is the control of the computer and command centre, made up of such parts as arithmetic unit and controller

9、, etc.. The arithmetic unit can carry on 8 persons of arithmetic operation and unit ALU of logic operation while including one, the 1 storing device temporarilies of 8, storing device 2 temporarily, 8's accumulation device ACC, register B and procedure state register PSW, etc. Person who accumulate

10、ACC count by 2 input ends entered of checking etc. temporarily as one operation often, come from person who store 1 operation is it is it make operation to go on to count temporarily , operation result and loopback ACC with another one. In addition, ACC is often regarded as the transfer station of d

11、ata transmission on 8051 inside . The same as general microprocessor, it is the busiest register. Help remembering that agreeing with A expresses in the order. The controller includes the procedure counter , the order is depositted, the order decipher, the oscillator and timing circuit, etc. The pro

12、cedure counter is made up of counter of 8 for two, amounts to 16. It is a byte address counter of the procedure in fact, the content is the next IA that will carried out in PC. The content which changes it can change the direction that the procedure carries out . Shake the circuit in 8051 one-chip c

13、omputers, only need outer quartz crystal and frequency to finely tune the electric capacity, its frequency range is its 12MHZ of 1.2MHZ. This pulse signal, as 8051 basic beats of working, namely the minimum unit of time. 8051 is the same as other computers, the work in harmony under the control of t

14、he basic beat, just like an orchestra according to the beat play that is commanded. There are ROM (procedure memory , can only read ) and RAM in 8051 slices (data memory, can is it can write ) two to read, they have each independent memory address space, dispose way to be the same with general m

15、emory of computer. Procedure 8051 memory and 8751 slice procedure memory capacity 4KB, address begin from 0000H, used for preserving the procedure and form constant. Data 8051- 8751 8031 of memory data memory 128B, address false 00FH, use for middle result to deposit operation, the data are stored t

16、emporarily and the data are buffered etc.. In RAM of this 128B, there is unit of 32 byteses that can be appointed as the job register, this and general microprocessor is different, 8051 slice RAM and job register rank one formation the same to arrange the location. It is not very the same that the m

17、emory of MCS-51 series one-chip computer and general computer disposes the way in addition. General computer for first address space, ROM and RAM can arrange in different space within the range of this address at will, namely the addresses of ROM and RAM, with distributing different address space in

18、 a formation. While visiting the memory, corresponding and only an address Memory unit, can ROM, it can be RAM too, and by visiting the order similarly. This kind of memory structure is called the structure of Princeton. 8051 memories are divided into procedure memory space and data memory space on

19、the physics structure, there are four memory spaces in all: The procedure stores in one and data memory space outside data memory and one in procedure memory space and one outside one, the structure forms of this kind of procedure device and data memory separated form data memory, called Harvard str

20、ucture. But use the angle from users, 8051 memory address space is divided into three kinds: (1) In the slice, arrange blocks of FFFFH , 0000H of location , in unison outside the slice (use 16 addresses). (2) The data memory address space outside one of 64KB, the address is arranged from 0000H 64KB

21、FFFFH (with 16 addresses ) too to the location. (3) Data memory address space of 256B (use 8 addresses). Three above-mentioned memory space addresses overlap, for distinguishing and designing the order symbol of different data transmission in the instruction system of 8051: CPU visit slice, ROM orde

22、r spend MOVC , visit block RAM order uses MOVX outside the slice, RAM order uses MOV to visit in slice. 8051 one-chip computer have four 8 walk abreast I/O port, call P0, P1, P2 and P3. Each port is 8 accurate two-way mouths, accounts for 32 pins altogether. Every one I/O line can be used as int

23、roduction and exported independently. Each port includes a latch (namely special function register ), one exports the driver and a introduction buffer . Make data can latch when outputting, data can buffer when making introduction , but four function of passway these self-same. Expand among the syst

24、em of memory outside having slice, four port these may serve as accurate two-way mouth of I/O in common use. Expand among the system of memory outside having slice, P2 mouth see high 8 address off; P0 mouth is a two-way bus, send the introduction of 8 low addresses and data / export in timesharing

25、 The circuit of 8051 one-chip computers and four I/O ports is very ingenious in design. Familiar with I/O port logical circuit, not only help to use ports correctly and rationally, and will inspire to designing the peripheral logical circuit of one-chip computer to some extent. Load ability and inte

26、rface of port have certain requirement, because output grade, P0 of mouth and P1 end output, P3 of mouth grade different at structure, so, the load ability and interface of its door demand to have nothing in common with each other. P0 mouth is different from other mouths, its output grade draws the

27、resistance supremly. When using it as the mouth in common use to use, output grade is it leak circuit to turn on, is it is it urge NMOS draw the resistance on taking to be outer with it while inputting to go out to fail. When being used as introduction, should write "1" to a latch first. Every one w

28、ith P0 mouth can drive 8 Model LS TTL load to export. P1 mouth is an accurate two-way mouth too, used as I/O in common use. Different from P0 mouth output of circuit its, draw load resistance link with power on inside have. In fact, the resistance is that two effects are in charge of FET and togethe

29、r: One FET is in charge of load, its resistance is regular. Another one can is it lead to work with close at two state, make its President resistance value change approximate 0 or group value heavy two situation very. When it is 0 that the resistance is approximate , can draw the pin to the high lev

30、el fast ; When resistance value is very large, P1 mouth, in order to hinder the introduction state high. Output as P1 mouth high electricity at ordinary times, can is it draw electric current load to offer outwards, draw the resistance on needn't answer and thenning. Here when the port is used as in

31、troduction, must write into 1 to the corresponding latch first too, make FET end. Relatively about 20,000 ohms because of the load resistance in scene and because 40,000 ohms, will not exert an influence on the data that are input. The structure of P2 some mouth is similar to P0 mouth, there are MUX

32、 switches. Is it similar to mouth partly to urge, but mouth large a conversion controls some than P1. P3 mouth one multi-functional port, mouth getting many than P1 it have "and " 3 door and 4 buffer". Two part these, make her besides accurate two-way function with P1 mouth just, can also use the se

33、cond function of every pin, "and " door 3 function one switch in fact, it determines to be to output data of latch to output second signal of function. Act as W =At 1 o'clock, output Q end signal; Act as Q =At 1 o'clock, can output W line signal . At the time of programming, it is that the first fun

34、ction is still the second function but needn't have software that set up P3 mouth in advance . It hardware not inside is the automatic to have two function outputted when CPU carries on SFR and seeks the location (the location or the byte ) to visit to P3 mouth /at not lasting lining, there are insi

35、de hardware latch Qs =1.The operation principle of P3 mouth is similar to P1 mouth. Output grade , P3 of mouth , P1 of P1 , connect with inside have load resistance of drawing , every one of they can drive 4 Model LS TTL load to output. As while inputting the mouth, any TTL or NMOS circuit can d

36、rive P1 of 8051 one-chip computers as P3 mouth in a normal way . Because draw resistance on output grade of them have, can open a way collector too or drain-source resistance is it urge to open a way, do not need to have the resistance of drawing outerly . Mouths are all accurate two-way mouths too.

37、 When the conduct is input, must write the corresponding port latch with 1 first . As to 80C51 one-chip computer, port can only offer milliampere of output electric currents, is it output mouth go when urging one ordinary basing of transistor to regard as, should contact a resistance among the port

38、and transistor base , in order to the electricity while restraining the high level from exporting P1~P3 Being restored to the throne is the operation of initializing of an one-chip computer. Its main function is to turn PC into 0000H initially , make the one-chip computer begin to hold the conduct p

39、rocedure from unit 0000H. Except that the ones that enter the system are initialized normally,as because procedure operate it make mistakes or operate there aren't mistake, in order to extricate oneself from a predicament , need to be pressed and restored to the throne the key restarting too. It is

40、an input end which is restored to the throne the signal in 8051 China RST pin. Restore to the throne signal high level effective , should sustain 24 shake cycle (namely 2 machine cycles ) the above its effective times. If 6 of frequency of utilization brilliant to shake, restore to the throne signal

41、 duration should exceed 4 delicate to finish restoring to the throne and operating. Produce the logic picture of circuit which is restored to the throne the signal: Restore to the throne the circuit and include two parts outside in the chip entirely. Outside that circuit produce to restore to the t

42、hrone signal (RST ) hand over to Schmitt's trigger, restore to the throne circuit sample to output , Schmitt of trigger constantly in each S5P2 , machine of cycle in having one more , then just got and restored to the throne and operated the necessary signal insidly. Restore to the throne resistance

43、 of circuit generally, electric capacity parameter suitable for 6 brilliant to shake, can is it restore to the throne signal high level duration greater than 2 machine cycles to guarantee. Being restored to the throne in the circuit is simple, its function is very important. Pieces of one-chip compu

44、ter system could normal running,should first check it can restore to the throne not succeeding. Checking and can pop one's head and monitor the pin with the oscillograph tentatively, push and is restored to the throne the key, the wave form that observes and has enough range is exported (instantaneo

45、us), can also through is it restore to the throne circuit group holding value carry on the experiment to change. MCS -51系列單片機(jī)的功能和結(jié)構(gòu) ? MCS - 51系列單片機(jī)具有一個(gè)單芯片電腦的結(jié)構(gòu)和功能，它是英特爾公司生產(chǎn)的系列產(chǎn)品的名稱。這家公司在1976年推出后，引進(jìn)8位單芯片的MCS - 48系列計(jì)算機(jī)后于1980年推出的8位的MCS - 51系列單芯片計(jì)算機(jī)。諸如此類的單芯片電腦有很多種，如8051，8031，8751，80C51BH，80C31BH等，其根

46、本組成，根本性能和指令系統(tǒng)都是相同的。 8051是51系列單芯片電腦的代表。 ????一個(gè)單芯片的計(jì)算機(jī)系統(tǒng)由以下幾個(gè)局部組成：〔1〕一個(gè)8位的微處理器〔CPU〕。〔2〕片內(nèi)數(shù)據(jù)存儲器RAM〔128B/256B〕，它只讀/寫數(shù)據(jù)，如結(jié)果不在操作過程中，最終結(jié)果要顯示數(shù)據(jù)〔3〕程序存儲器ROM/ EPROM〔4KB/8KB〕，是用來保存程序，一些初步的數(shù)據(jù)和切片的形式。但一些單芯片電腦沒有考慮ROM / EPROM，如8031，8032，80C51等等。〔4〕4個(gè)8路運(yùn)行的I / O接口，P0，P1,P2,P3，每口可以用作入口，也可以用作出口。 〔5〕兩個(gè)定時(shí)/計(jì)數(shù)器，每個(gè)定時(shí)/計(jì)數(shù)器可設(shè)

47、置和計(jì)數(shù)的方式，用來計(jì)數(shù)外部事件，可以設(shè)置成定時(shí)方式也可以根據(jù)計(jì)算結(jié)果或定時(shí)控制實(shí)現(xiàn)計(jì)算機(jī)。 〔6〕5個(gè)中斷 〔7〕一個(gè)全雙工串行的I / UART〔通用異步接收器I口/發(fā)送器〔UART〕〕，它是實(shí)現(xiàn)單芯片電腦或單芯片計(jì)算機(jī)和計(jì)算機(jī)的串行通信使用。 〔8〕振蕩器和時(shí)鐘產(chǎn)生電路，需要考慮石英晶體微調(diào)能力。允許振蕩頻率為12MHz，每一個(gè)上述的局部都是通過內(nèi)部數(shù)據(jù)總線連接。其中CPU是一個(gè)芯片計(jì)算機(jī)的核心，它是計(jì)算機(jī)的指揮中心，是由算術(shù)單元和控制器等局部組成。算術(shù)單元可以進(jìn)行8位算術(shù)運(yùn)算和邏輯運(yùn)算， ALU單元是其中一種運(yùn)算器，1 8個(gè)存儲設(shè)備，暫存設(shè)備的積累設(shè)備進(jìn)行協(xié)調(diào)，程序狀態(tài)存放器PSW積累

48、了2個(gè)輸入端的計(jì)數(shù)等檢查暫時(shí)作為一個(gè)操作往往由人來操作誰儲存1輸入的是它使操作去上暫時(shí)計(jì)數(shù)，另有一個(gè)操作的結(jié)果，回環(huán)協(xié)調(diào)。此外，協(xié)調(diào)往往是作為對8051內(nèi)的數(shù)據(jù)傳輸轉(zhuǎn)運(yùn)站考慮。作為一般的微處理器，它是最繁忙的，幫助記住和同意與其的順序表示。該控制器包括程序計(jì)數(shù)器，解密的順序。振蕩器和定時(shí)電路等的程序計(jì)數(shù)器是一個(gè)由8個(gè)計(jì)數(shù)器為2，總計(jì) 16位。這是一個(gè)字節(jié)的地址，其實(shí)程序計(jì)數(shù)器，是將在個(gè)人電腦內(nèi)進(jìn)行。從而改變它的內(nèi)容可以改變方向的程序進(jìn)行。在8051的單芯片電腦中的電路，只需要外部石英晶體和頻率微調(diào)電容，其頻率范圍為1.2MHz的其12MHz的。這種脈沖信號，作為8051的工作，即單位時(shí)間的最低

49、根本節(jié)奏。 8051是其他電腦一樣，在拍控制的根本工作在和諧，就像一個(gè)管弦樂隊(duì)，根據(jù)擊敗發(fā)揮是指揮。 ???有光盤〔程序存儲器，只能讀取〕，并在8051片〔數(shù)據(jù)存儲器RAM，可以是可寫可讀，他們各自獨(dú)立的內(nèi)存地址空間，處理方法是，與一般的電腦記憶體相同。 8051和8751的程序存儲器的存儲容量4KB的程序切片，地址開始從0000H開始執(zhí)行，維護(hù)的程序和形式不斷使用。數(shù)據(jù)8051 - 8751的內(nèi)存數(shù)據(jù)存儲器128B條8031，地址虛假00FH，中層結(jié)果存入操作使用，數(shù)據(jù)存儲和數(shù)據(jù)是暫時(shí)緩沖等。在這128B條內(nèi)存，有32 字節(jié)，可以作為工作存放器使用，這和一般的微處理器是不同的，8051片

50、RAM和登記形成的同一級到安排的位置。這不是很相同的，MCS - 51系列內(nèi)存的單芯片計(jì)算機(jī)和通用計(jì)算機(jī)作主除了道路。通用計(jì)算機(jī)的第一個(gè)地址空間，ROM和RAM，可安排在不同的空間在這個(gè)范圍內(nèi)的地址范圍，即ROM和RAM地址的形成與分布在不同的地址空間。在訪問內(nèi)存，相應(yīng)的，只有一個(gè)地址的內(nèi)存單元，可以用外部存儲，也可以內(nèi)存，并通過訪問順序與此類似。這種內(nèi)存結(jié)構(gòu)的一種被稱為普林斯頓結(jié)構(gòu)。 8051記憶分為程序存儲器空間和數(shù)據(jù)存儲空間的物理結(jié)構(gòu)上劃分，有四個(gè)在所有的記憶體空間：在1和數(shù)據(jù)外部數(shù)據(jù)存儲器和程序存儲器空間之一，一組在外面一個(gè)內(nèi)存空間的程序商店，結(jié)構(gòu)這一種形式的程序和數(shù)據(jù)存儲器器件數(shù)據(jù)存

51、儲器分開的形式，稱為哈佛結(jié)構(gòu)。但是，從用戶使用，8051的內(nèi)存地址空間分為三種：分為〔1〕片內(nèi)，〔使用16個(gè)地址一致的FFFFH，地點(diǎn)為0000H，塊〕。 〔2〕64KB的外部數(shù)據(jù)存儲器空間的一個(gè)地址，該地址是從0000H開始執(zhí)行64KB的FFFFH安排16地址，也到該位置。 〔3〕數(shù)據(jù)存儲器的256B〔使用8個(gè)地址〕的地址空間。上述三個(gè)內(nèi)存空間的地址重疊，區(qū)分和設(shè)計(jì)的8051指令系統(tǒng)中不同的數(shù)據(jù)傳輸順序代碼：CPU的訪問片，，訪問RAM塊順序使用MOVX指令外片，內(nèi)存為訪問片。 ???8051單芯片的電腦有4個(gè)8步行并進(jìn)的I / O端口，分別為P0，P1，P2和P3。每個(gè)端口8位的雙向口

52、，共占了32針。每一個(gè)I / O線可作為獨(dú)立的入口和出口。每個(gè)端口包括一個(gè)鎖存器〔即特殊功能存放器〕，1名入口和1出口引進(jìn)緩沖區(qū)。使數(shù)據(jù)能鎖存輸出時(shí)，數(shù)據(jù)緩沖區(qū)時(shí)，可以引進(jìn)，但4個(gè)通道這些自我相同的功能。系統(tǒng)中的內(nèi)存片展開外來的，這四個(gè)港口可作為準(zhǔn)確的雙向的I /共同使用輸出口。系統(tǒng)的內(nèi)存中展開外來的片，P2口處于高位，8地址關(guān)閉;入口P0口是雙向總線，發(fā)送地址和8個(gè)低數(shù)據(jù)。 8051單芯片電腦的4個(gè)I / O端口是非常巧妙的電路設(shè)計(jì)。熟悉I/ O端口的邏輯電路，不僅有助于正確和合理利用端口，并在一定程度上將有助于設(shè)計(jì)周邊的單芯片計(jì)算機(jī)的邏輯電路。在一定程度上負(fù)載能力和端口界面有一

53、定的要求，因?yàn)檩敵黾墸蚉1口輸出端，P3口與P0口結(jié)構(gòu)的不同，因此，負(fù)載能力和接口需求互相無太多共同之處。求解P0口是與其他口不同，它的輸出級提請阻力。當(dāng)使用的常用是它的輸出級電路泄漏翻開，它是利用它敦促采取NMOS管能與它外部的阻力，而輸入走出失敗。當(dāng)被用作數(shù)據(jù)，應(yīng)該寫“1”到內(nèi)部，每一個(gè)P0口與一個(gè)可以驅(qū)動(dòng)8型號LS TTL負(fù)載出口。P1口是一個(gè)準(zhǔn)確的雙向口，共同使用輸出口。不同在P0口輸出的電路，得出與負(fù)載功率電阻內(nèi)有聯(lián)系。事實(shí)上，阻力是，兩個(gè)效果是在場效應(yīng)管，共同負(fù)責(zé)：一個(gè)場效應(yīng)管的負(fù)載負(fù)責(zé)，它的電阻是正常的。另一條是它可以導(dǎo)致在兩個(gè)工作狀態(tài)密切，使其電阻值變化近似0或2組值的情況非

54、常嚴(yán)重。當(dāng)它是0，該阻力是近似的，可以提請較快的高層次，當(dāng)電阻值是非常大的，P1口以阻礙引進(jìn)高電平。為P1口輸出高電平時(shí)，它是可以借鑒的負(fù)載提供電流向外，提請電阻無須答復(fù)。在這里，當(dāng)端口作為引進(jìn)使用，必須首先寫入1到相應(yīng)的鎖存，使FET的結(jié)束。相對約20,000歐姆，因?yàn)樵诂F(xiàn)場，因?yàn)樨?fù)載電阻和40,000歐姆，不會(huì)產(chǎn)生對輸入的數(shù)據(jù)的影響。一些為P2結(jié)構(gòu)類似于P0口，有MUX的開關(guān)。它是類似口局部，大的一個(gè)轉(zhuǎn)換控制P1口的多功能端口，獲得第一位，這有很多“與〞門和4個(gè)緩沖。兩局部，其中除了作出準(zhǔn)確的雙向功能，還可以使用第二個(gè)函數(shù)的每一個(gè)針“與〞門三功能開關(guān)，實(shí)際上，它決定將輸出數(shù)據(jù)鎖存到輸出的函

55、數(shù)的第二個(gè)信號為W = 1點(diǎn)，輸出Q端信號。法令;法為Q = 1時(shí)時(shí)，可以輸出w線路信號，在制定方案的時(shí)侯，那就是第一個(gè)函數(shù)仍是第二個(gè)功能，但不必軟件預(yù)先設(shè)置P3口。IT硬件里面是不是有自動(dòng)兩個(gè)函數(shù)輸出時(shí)的CPU進(jìn)行SFR和要求的位置〔位置或字節(jié)〕來訪問，在沒有至P3口，里面有硬件鎖Q報(bào)表，P3口的工作原理類似于P1口。 ???輸出級，P1，P3口連接內(nèi)帶的負(fù)載電阻的圖紙，每一個(gè)能驅(qū)動(dòng)4型號LS TTL負(fù)載輸出1。由于輸入口，任何TTL或NMOS電路可以驅(qū)動(dòng)8051的單芯片在一個(gè)正常的方式。因?yàn)樗麄兝幂敵黾壸枇Γ梢苑_漏源電阻以敦促翻開方式，不需要有阻力。都是準(zhǔn)確的雙向口。當(dāng)行為是輸入

56、，必須編寫相應(yīng)的鎖存器。至于80C51的單芯片計(jì)算機(jī)，端口只能提供輸出毫安的電流，是它的輸出口去當(dāng)一個(gè)普通的晶體管，要求應(yīng)與端口之間和晶體管的基極電阻，以電而從出口限制P1?P3被恢復(fù)了的高水平，是一個(gè)單芯片電腦初始化操作。其主要功能是把最初的PC為0000H，使單芯片電腦開始持有單位0000H開始執(zhí)行程序的行為。唯一例外的是那些進(jìn)入系統(tǒng)初始化正常，程序操作，而是因?yàn)樗噶隋e(cuò)或沒有錯(cuò)，為了擺脫自己的困境，需要按下和恢復(fù)位的按鍵鍵重新啟動(dòng)了。這是一個(gè)輸入端是恢復(fù)位，在8051中國RST引腳信號。恢復(fù)位的信號復(fù)原到高一級的有效值，應(yīng)維持24倍以上的有效周期〔即2個(gè)機(jī)器周期〕。如果使用頻率6，恢復(fù)位

57、的信號持續(xù)時(shí)間應(yīng)超過4微妙完成恢復(fù)。設(shè)計(jì)的電路，恢復(fù)位的信號邏輯圖： 恢復(fù)位的電路和芯片包括兩個(gè)局部外完全。以外的電路產(chǎn)生恢復(fù)到施密特觸發(fā)了位信號〔RST〕，恢復(fù)位電路例如輸出，施密特不斷在每個(gè)S5P2，觸發(fā)機(jī)循環(huán)，那么就得到了恢復(fù)位所需的信號。復(fù)原6電阻的電路一般，電容參數(shù)適合，它是可以恢復(fù)到較高水平的信號持續(xù)時(shí)間大于2個(gè)機(jī)器周期來保證。作為恢復(fù)到電路，其功能是非常重要的。一個(gè)芯片的計(jì)算機(jī)系統(tǒng)能夠正常運(yùn)轉(zhuǎn)，應(yīng)先檢查它可不可以恢復(fù)。檢查可以彈出一個(gè)首部和監(jiān)測與示波器針暫定，推動(dòng)并恢復(fù)位的關(guān)鍵，波形式觀察和有足夠的范圍是出口〔瞬時(shí)〕，也可以通過它使恢復(fù)電路進(jìn)行改變。 羀肈薃螇袆

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64、肅蕆薈羇膅膇螄袃膄艿薇蝿膃莂螂螅膂薄蚅肄膁芄蒈羀膀莆蚃袆腿蒈蒆螂腿膈螞蚈羋芀蒄羆芇莃蝕袂芆蒅蒃袈芅芅螈螄芄莇薁肅芃葿螆罿芃薂蕿裊節(jié)芁螅螁羈莃薈蚇羇蒆螃羅羇膅薆羈羆莈袁袇羅蒀蚄螃羄薂蕆肂羃節(jié)螞羈羂莄蒅襖肁蕆蟻螀肁膆蒄蚆肀艿蠆肄聿蒁蒂羀肈薃螇袆?wù)仄M薀螂肆蒞螆蚈肅蕆薈羇膅膇螄袃膄艿薇蝿膃莂螂螅膂薄蚅肄膁芄蒈羀膀莆蚃袆腿蒈蒆螂腿膈螞蚈羋芀蒄羆芇莃蝕袂芆蒅蒃袈芅芅螈螄芄莇薁肅芃葿螆罿芃薂蕿裊節(jié)芁螅螁羈莃薈蚇羇蒆螃羅羇膅薆羈羆莈袁袇羅蒀蚄螃羄薂蕆肂羃節(jié)螞羈羂莄蒅襖肁蕆蟻螀肁膆蒄蚆肀艿蠆肄聿蒁蒂羀肈薃螇袆?wù)仄M薀螂肆蒞螆蚈肅蕆薈羇膅膇螄袃膄艿薇蝿膃莂螂螅膂薄蚅肄膁芄蒈羀膀莆蚃袆腿蒈蒆螂腿膈螞蚈羋芀蒄羆芇莃蝕袂

65、芆蒅蒃袈芅芅螈螄芄莇薁肅芃葿螆罿芃薂蕿裊節(jié)芁螅螁羈莃薈蚇羇蒆螃羅羇膅薆羈羆莈袁袇羅蒀蚄螃羄薂蕆肂羃節(jié)螞羈羂莄蒅襖肁蕆蟻螀肁膆蒄蚆肀艿蠆肄聿蒁蒂羀肈薃螇袆?wù)仄M薀螂肆蒞螆蚈肅蕆薈羇膅膇螄袃膄艿薇蝿膃莂螂螅膂薄蚅肄膁芄蒈羀膀莆蚃袆腿蒈蒆螂腿膈螞蚈羋芀蒄羆芇莃蝕袂芆蒅蒃袈芅芅螈螄芄莇薁肅芃葿螆罿芃薂蕿裊節(jié)芁螅螁羈莃薈蚇羇蒆螃羅羇膅薆羈羆莈袁袇羅蒀蚄螃羄薂蕆肂羃節(jié)螞羈羂莄蒅襖肁蕆蟻螀肁膆蒄蚆肀艿蠆肄聿蒁蒂羀肈薃螇袆?wù)仄M薀螂肆蒞螆蚈肅蕆薈羇膅膇螄袃膄艿薇蝿膃莂螂螅膂薄蚅肄膁芄蒈羀膀莆蚃袆腿蒈蒆螂腿膈螞蚈羋芀蒄羆芇莃蝕袂芆蒅蒃袈芅芅螈螄芄莇薁肅芃葿螆罿芃薂蕿裊節(jié)芁螅螁羈莃薈蚇羇蒆螃羅羇膅薆羈羆莈袁袇羅蒀蚄螃

66、羄薂蕆肂羃節(jié)螞羈羂莄蒅襖肁蕆蟻螀肁膆蒄蚆肀艿蠆肄聿蒁蒂羀肈薃螇袆?wù)仄M薀螂肆蒞螆蚈肅蕆薈羇膅膇螄袃膄艿薇蝿膃莂螂螅膂薄蚅肄膁芄蒈羀膀莆蚃袆腿蒈蒆螂腿膈螞蚈羋芀蒄羆芇莃蝕袂芆蒅蒃袈芅芅螈螄芄莇薁肅芃葿螆罿芃薂蕿裊節(jié)芁螅螁羈莃薈蚇羇蒆螃羅羇膅薆羈羆莈袁袇羅蒀蚄螃羄薂蕆肂羃節(jié)螞羈羂莄蒅襖肁蕆蟻螀肁膆蒄蚆肀艿蠆肄聿蒁蒂羀肈薃螇袆?wù)仄M薀螂肆蒞螆蚈肅蕆薈羇膅膇螄袃膄艿薇蝿膃莂螂螅膂薄蚅肄膁芄蒈羀膀莆蚃袆腿蒈蒆螂腿膈螞蚈羋芀蒄羆芇莃蝕袂芆蒅蒃袈芅芅螈螄芄莇薁肅芃葿螆罿芃薂蕿裊節(jié)芁螅螁羈莃薈蚇羇蒆螃羅羇膅薆羈羆莈袁袇羅蒀蚄螃羄薂蕆肂羃節(jié)螞羈羂莄蒅襖肁蕆蟻螀肁膆蒄蚆肀艿蠆肄聿蒁蒂羀肈薃螇袆?wù)仄M薀螂肆蒞螆蚈肅蕆薈羇膅膇螄袃膄艿薇蝿膃莂螂螅膂薄蚅肄膁芄蒈羀膀莆蚃袆腿蒈蒆螂腿膈螞蚈羋芀蒄羆芇莃蝕袂芆蒅蒃袈芅芅螈螄芄莇薁肅芃葿螆罿芃薂蕿裊節(jié)芁螅螁羈莃薈蚇羇蒆螃羅羇膅薆羈羆莈袁袇羅蒀蚄螃羄薂蕆肂羃節(jié)螞羈羂莄蒅襖肁蕆蟻螀肁膆蒄蚆肀艿蠆肄聿蒁蒂羀肈薃螇袆?wù)仄M薀螂肆蒞螆蚈肅蕆薈羇膅膇螄袃膄艿薇蝿膃莂螂螅膂薄蚅肄膁芄蒈羀膀莆蚃袆腿蒈蒆螂腿膈螞蚈羋芀蒄羆芇莃蝕袂芆蒅蒃袈芅芅螈螄芄莇薁肅芃葿螆罿芃薂蕿裊節(jié)芁螅螁羈莃薈蚇羇蒆螃羅