通信工程中英文对照外文翻译文献

中英文对照外文翻译

(文档含英文原文和中文翻译)

外文:

Structure and function of the MCS-51 series

Structure and function of the MCS-51 series one-chip computer MCS-51 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 in 1976. It belong to a lot of kinds this line of one-chip computer the chips have ,such as 8051, 8031,8751,80C51 BH, 80C31BH,etc., their basic composition, basic performance and instruction system are all the same. 8051 daily representatives- 51 serial one-chip computer .An one-chip computer system is made up of several following parts: (1) One microprocessor of 8 (CPU).

(2) At slice data memory RAM (128B/256B),it used to depositing 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(4KB/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 canuse as introduction , may use as exporting too.

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

(7)One all duplex 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 need outer.

Allow oscillation frequency as 12 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,etc.. The arithmetic unit can carry on 8 persons of arithmetic operation and unit ALUof logic operation while including one, the 1 storing device temporarily of 8, storingdevice 2 temporarily, 8's accumulation device ACC, register B and procedure stateregister PSW, etc. Person who accumulate ACC count by 2 input ends entered of

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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 loop back ACC with another one. In addition, ACC is often regarded as the transferstation of data 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 deposited, the order decipher, the oscillator and timing circuit, etc. The procedure 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 computers, 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 the 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 memory 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 temporarily and the data are buffered etc.. In

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RAM of this 128B, there is unit of 32 bytes 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 memory 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 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 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 structure. 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 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 order spend MOVC, visit block RAM order uses MOVX

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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 introduction 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 pass way these self-same. Expand among the system 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 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 interface of port have certain requirement, because output grade, P0 of mouth and P1 end output, P3 of mouth gradedifferent 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 resistance supreme. 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 \

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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 together :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 level fast http://wenku.http://www.wodefanwen.com//view/9ca78b07caaedd3383c4d383.html?from=search 4/6 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 then.

Here when the port is used as introduction, must write into 1 to the corresponding latch first too, make FET end. The structure of P2 some mouth is similar to P0 mouth, there are MUX 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 \accurate two-way function with P1 mouth just, can also use the second function of every pin, \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 function is still the second function but needn't have software that set

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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 inside 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 drive 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 outer . Mouths are all accurate two-way mouths too. 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 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 procedure 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 an input end which is restored to the throne the signal in 8051 China RST pin. Restore to the throne signal high level

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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 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 throne 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 of circuit generally, electric capacity parameter suitable shake, can is it restore to the throne signal high level duration greate fro trh a6n b2r imlliaacnhti ntoe cycles to guarantee. Being restored to the throne in the circuit is simple, its function is very important. Pieces of one-chip computer 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 (instantaneous), can also through is it restore to the throne circuit group holding value

carry on the experiment to change.

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中文文献

51系列单片机的结构和功能

51 系列单片机是英特尔公司生产的具有一定结构和功能的单片机产品。这家公司在1976 年引入8 位MCS - 48 系列单片机后，于1980 年又推出了8 位高档的MCS - 51 系列单片机。它包含很多种这类型的单片机，如8051，8031，8751，80C51BH，80C31BH 等，它们的基本组成，基本性能和指令系统都是一样的。一般情况习惯用8051 来代表51 系列单片机。一个单片机的系统是由以下几部分组成：

（1）一个8 位CPU 微处理器。

（2）静态随机存取存储器，能够储存程序运行过程中产生的数据。

（3）程序存储器ROM / EPROM 中（4KB/8KB），用来保存程序和一些初始数据。

但是在一些单片机中不使用ROM / EPROM 中，如8031，8032，80c 系列等。 （4）4 个8 排的I / O 并行接口P0 ~P3，每个口可以用作输入，也可以用作

输出。

（5）2 个定时器/计数器，每个定时器/计数器可设置计数用来计数外部事件，

可以设置成常用的定时方式，并可以根据计算或结果控制单片机的运行。 （6）五个中断源控制系统。

（7）1 个双向串行I / O 口的UART（通用异步接收器/发送器UART），用于实

现单片机的串行通信。

（8）振荡器和时钟产生电路，需要外部电源的石英晶体微调电路，允许接在12v

的振荡频率上。

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上述部分通过内部数据总线连接。其中，CPU 是单片机的核心，它是单片机的控制和指挥中心，ALU 算数逻辑运算单元可进行算术运算和逻辑运算，由1 个 8 暂时存储器，和2 个 8 位的累加器组成。

Acc 累加器是ALU 运算结果的存放单元，一般数据通过它来传送。此外，Acc 往往被视为对8051 内的数据传输中转站。和通常的微处理器一样，它是最繁忙 的寄存器。有记忆功能并执行命令。该控制器包括程序计数器，可读写的存储器， 振荡器和定时电路等。该程序计数器是有两对8 或16 位计数器，它是一个字节 地址计数器，在个人电脑运行程序时，执行下一个单元的内容，程序执行时可以 改变它的内容从而改变运行的结果。在8051 芯片震荡电路中，需要外接石英晶体和微调电容，其频率范围为1.2MHz—12MHz。该脉冲信号，即为8051 的工作周期，是最小的时间单位。8051 和其他单片机一样，都有相同的控制和功能,就像乐队也有打击乐器一样。在8051 中有ROM（程序存储器，只能读取），和RAM（数据存储器，可以读和写），他们有各自独立的内存地址空间，也有相同的处理方式。8051 和8751的程序存储器的存储容量为4KB，地址从0000H 开始，在使用过程中其中的数据不变。8051、8751、8031 数据存储器的内存为128B，默认地址是00FH，用于保存中间数据和缓存。在这128B 的内存中，有32 byteses，被称作工作寄存器，和常用的微处理器不同的是，8051 的RAM 是按功能来划分模块的。MCS -51 系列单片机和一般电脑的处理方式不同。一般电脑会自动分配地址空间，ROM和RAM 的计算机可以安排在不同的空间内，地址范围会根据ROM 和RAM 的位置分配不同地址空间。在访问的内存，不管是ROM 和RAM，只有一个地址对应一个内存单元，都要按这个顺序访问。这种内存结构是所谓的普林斯顿结构。8051 的存储器按物理结构划分可分为程序存储器空间和数据存

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