【机械类文献翻译】51系列单片机的功能和结构

Structure and function of the MCS-51 seriesStructure 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, 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 computer 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 (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 can use 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 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) 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 need 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 , 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 stateregister PSW, etc. Person who accumulate 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 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 depositted, 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 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 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 differentaddress 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 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 passway 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. Loadability and interface 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 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 with 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 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 ; 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 introduction, 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 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 second 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 function is still the second function but needn't havesoftware 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 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 outerly . 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 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 thronesignal (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 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 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.51系列单片机的功能和结构结构和功能的监控监-51系列之一--计算机芯片监控监-51名是一幅一个电脑晶片,英特尔公司生产系列. 这家公司推出8级一个计算机芯片监控监-51系列之后,于1980年8引入一个计算机芯片监控监,于1976年48系列.。

MCS-51 单片机内部结构及功能简介1.结构
(1)中央处理单元(8 位)
数据处理、测试位，置位，复位位操作
(2)只读存储器(4KB 或8KB)
永久性存储应用程序，掩模ROM、EPROM、EEPROM
(3)随机存取内存(128B、128B SFR)
在程序运行时存储工作变量和资料
(4)并行输入/输出口(I / O)(32 条)
作系统总线、扩展外存、I / O 接口芯片
(5)串行输入/输出口(2 条)
串行通信、扩展I / O 接口芯片
(6)定时/计数器(16 位、加1 计数)
计满溢出、中断标志置位、向CPU 提出中断请求，与CPU 之间独立工作(7)时钟电路
内振、外振。

(8)中断系统
五个中断源、2 级优先。

图片1
2.结构特点：
MCS-51 系列单片机为哈佛结构(而非普林斯顿结构)
1)内ROM：4KB
2)内RAM：128B
3)外ROM：64KB
4)外RAM：64KB
5)I / O 线：32 根(4 组，每组8 根)
6)定时/计数器：2 个16 位可编程定时/计数器
7)串行口：全双工，2 根
8)寄存器区：工作寄存器区、在内128B RAM 中，分4 个区
9)中断源：5 源中断，2 级优先
10)堆栈：最深128B
11)布尔处理机：位处理机，某位单独处理
12)指令系统：五大类，111 条。

简述一般单片机的结构及各个部分的功能单片机（Microcontroller）是一种集成了处理器核心、存储器和各种外设接口的微型计算机系统。

它通常被应用于嵌入式系统中，用于控制、通信和数据处理等任务。

本文将对一般单片机的结构及各个部分的功能进行简述。

一、单片机的结构一般单片机包含三个核心部分，即中央处理器（Central Processing Unit，简称CPU）、存储器和外设接口。

这些部分通过总线连接在一起，形成了一个完整的单片机系统。

1. 中央处理器（CPU）中央处理器是单片机的核心部件，它负责执行程序指令、控制数据流动和处理数据。

CPU包括指令执行单元、时钟控制单元和寄存器等模块。

指令执行单元解码和执行存储器中的程序指令，时钟控制单元提供时钟信号使CPU工作，寄存器用于存储和传输数据。

2. 存储器存储器用于存储程序指令和数据。

它通常包括随机存储器（Random Access Memory，简称RAM）和只读存储器（Read-Only Memory，简称ROM）。

RAM用于存储临时数据和程序运行过程中的中间结果，可读写。

ROM用于存储程序指令和常量数据，只读。

3. 外设接口外设接口是连接单片机与外部设备的接口，用于与外界进行信息交互。

常见的外设接口包括通用输入输出口（General PurposeInput/Output，简称GPIO）、串行接口、模拟到数字转换器（Analog-to-Digital Converter，简称ADC）等。

GPIO用于连接外部开关、LED 灯等外设，串行接口用于与其他设备进行串行通信，ADC用于将模拟信号转换为数字信号。

二、各个部分的功能1. 中央处理器（CPU）功能：- 指令执行：解码和执行存储器中的程序指令。

- 数据处理：对数据进行算术和逻辑运算。

- 控制：控制程序流程和数据流动。

2. 存储器功能：- RAM功能：存储程序执行过程中的中间结果、临时数据等。

- ROM功能：存储程序指令、常量数据等。

51单片机结构功能51单片机是指基于Intel的8051微处理器为核心的单片机，其结构功能丰富，被广泛应用于各种嵌入式系统。

一、结构51单片机采用冯·诺依曼结构，具有指令存储器和数据存储器，其中程序存储器（ROM）用于存储程序和表格数据，而数据存储器（RAM）用于存储可变数据。

51单片机还具有特殊功能寄存器（SFR），这些寄存器专门用于控制和设置单片机的各种功能。

二、功能1、运算功能：51单片机具有8位运算器，可以进行算术、逻辑和位运算。

2、控制功能：51单片机具有丰富的控制指令，可以实现如条件转移、跳转、中断等功能，还可以进行定时器和计数器的控制。

3、通信功能：51单片机可以通过串行口实现串行通信，也可以通过并行口实现并行通信。

4、存储功能：51单片机内部具有少量的RAM和ROM存储器，同时还可以外接扩展存储器。

5、定时/计数功能：51单片机内部具有定时器和计数器，可以实现定时和计数的功能。

6、中断功能：51单片机具有多个中断源，可以实现多级中断控制。

7、输入/输出功能：51单片机具有多个输入/输出端口，可以实现多种输入/输出控制。

51单片机以其结构紧凑、功能丰富、易于使用等特点，被广泛应用于工业控制、智能家居、消费电子等领域。

C51单片机寄存器功能湖山网络广播系统设计方案一、概述随着科技的发展和数字化的普及，网络广播系统在各种场所扮演着越来越重要的角色。

湖山网络广播系统设计方案旨在满足湖山地区对高质量、高效的网络广播系统的需求。

该方案旨在构建一个稳定、可靠、易用的网络广播系统，以满足湖山地区在公共广播、紧急通知、日常资讯等方面的需求。

二、系统需求分析1、稳定性：系统应具备高度的稳定性，能够保证长时间的连续运行，避免因设备故障或网络问题导致的广播中断。

2、可靠性：系统应具备可靠的备份机制，确保在主设备出现问题时，备份设备能够迅速接管，保证广播的连续性。

3、易用性：系统应具备良好的用户界面，操作简单易懂，方便管理员进行配置和管理。