AT89C2051单片机毕业论文外文翻译

1、AT89C2051 AT89C2051 is the United States of America ATMEL company p roducti on of low voltage, high p erforma nee CMOS 8 bit MCU, tablets containing the 2K bytes rep eated erasable read-only memory p rogram (P EROM) and 128bytes ran dom data memory (RAM), device using ATMELs high density, non-volati

2、le memory tech no logy, comp atible with sta ndard MCS-51 in structi on system in gen eral, sheet 8 bit CPU and Flash storage unit, AT89C2051 single-chip microcomputer in electronic p roducts in a wide range of app licati ons. In ternal structure AT89C2051 is a 2K byte flash programmable and erasabl

3、e read only memory (EEP ROM) low voltage, high performa nee 8 bit CMOS micro processor.lt uses ATMEL high-de nsity non-v olatile memory tech no logy manu facturi ng and in dustry sta ndard MCS-51 instruction set and pin structure compatible.Through the single chip combination of general CPLI and fla

4、sh memory, ATMEL AT89C2051 is a powerful micro p rocessor, which for many embedded con trol app licati ons to pro vide a highly flexible and low cost soluti on. AT89C2051 offers the following functions: Standard 2K memory, 128 bytes of RAM, 15 I/O, two 16 bit timer, a five vector two suspendedstruct

5、ure, a full duplex serial port, a precision analog comparator and two optional software power save mode.Free party stop CPU work but allows RAM, timer / counter, serial port and in terr upt system to continu e.The po wer-dow n mode saves the RAM content but the oscillator stops working and the prohi

6、bition of other parts of the work to the next a hardware reset. The con fide ntiality of the p rocedure AT89C2051 desig n p rocedures are 2 con fide ntial, con fide ntial 1 is p rogrammed, a p rogram memory can not be erased uni ess a p rogram ming, the security bit 2 is p rogrammed, p rogram cannot

7、 be read. Hardware and software devel opment AT89C2051 can use the following two methods and development of application systems. 1, because 89C2051 internal p rogram memory Flash, and modify it in side the program is very convenient, if equipped with a programmable 89C2051 p rogrammer.Debugg ing per

8、sonnel can use the p rogram edit ing - Comp ilati on - curi ng - in serted into a circuit board test such rep eated cycle method, for exp erie need MCS-51 p rogrammers, debugg ing this method is not very difficult.But to do this test would not be able to un dersta nd the internal RAM content and p r

9、ogram directi on and other releva nt in formatio n. 2, ordinary 8031/80C31 emulator simulation plug in P 1.0 P 1.7 and P3.0 P 3.6 out simulati on 2051, this method can use sin gle-ste p, break point debugg ing method, but the simulatio n is not true, for exa mp le, 2051 internal an alog comp arator

10、function, P1, P3 export enhan ceme nt un der ten sile cap acity etc. Pin descri ptio n AT89C2051 chip pin diagram The AT89C2051 pin diagram as show n on the right. In 1, VCC: po wer supply voltage. In 2, GND. In 3, P1: P1 is a 8 bit bidirectional I/O export.Port of P 1.2P 1.7 with internal puII-up r

11、esistor, P 1.0 and P 1.1 requires external pull up resistor.P1.0 and P 1.1 are resp ectively as on-chi p p recisi on an alog comp arator of the in-p hase input (ANI0) and the inverting input (AIN1).The P1 port out put buffer cap able of absorb ing 20mA curre nt and can directly dis play driver LED.W

12、he n the P1 port write 1, which can be used as input, whe n P 1.2 P 1.7 is used as the input pins and is externally p ulled low, they will because of in ternal write 1, which can be used as inpu t.Whe n the pin is P 1.2 P 1.7 as input and is exter nally p ulled low, they will because of internal pu

13、II-up resistor and the outflow curre nt. In 4, P3: P3 P3.0P3.5, P3.7 mouth with internal pull-up resistor seven bidirect ional I/O port.P 3.6 is used for fixing the input in the out put sig nal of the comp arator and it serves as a gen eral I/O pins that are not accessible .P3 port buffer can absorb

14、 20mA curre nt.Whe n the P3 export to write 1, they are internal p ull-up resistors are p ulled up and used as inpu t.As inpu t, is exter nally p ulled low P3 mouth foot will use the p ull-up resistor and the outflow curre nt. P3 is also used to achieve various AT89C2051 sec ond function, are listed

15、 in the followi ng table: Pin export function P3.0 RXD serial input port P3.1 TXD serial out put port P 3.2 INT0 external in terru pt 0 P3.3 INT1 external in terru pt 1 P3.4 T0 timer 0 external input P3.5 T1 timer 1 external input P3 also receives some for flash memory programming and verification p

16、rocess con trol sig nal. In 5, RST: reset inpu t. Once RST becomes the high level all the pins of the I/O is reset to 1 .Whe n the oscillator is running, continued to give RST pin two mach ine cycles of high level can compi ete reduct ion .Each mach ine cycle n eeds 12 oscillator or clock cycles. In

17、 6, XTAL1: as the oscillator inv erter input and internal clock gen erator input. In 7, XTAL2: as the oscillator the out put of the inverting amp lifier. Main p erforma nee In 1, and MCS-51 comp atibility; In 2, 2KB rep rogrammable memory FLASH (10000 times); In 3, 2.7-6V voltage range; 4, all stati

18、c work: 0Hz-24MH z; In 5, 2 level p rogram memory security lock; In 6, 128*8 in ternal RAM; 7, 15 p rogrammable I/O line; In 8, two and 16 timer / coun ter; 9, 6 in terr upt sources; 10, p rogrammable serial cha nn el; In 11, and high p recisi on voltage com parator (P1.0, P 1.1, P3.6); 12, direct d

19、rive LED out put port. AT89C2051是美国ATME公司生产的低电压、高性能 CMOS位单片机，片内 含2k bytes的可反复擦写的只读程序存储器（PERO）和128bytes的随机数据存 储器（RAM，器件采用ATMEL公司的高密度、非易失性存储技术生产，兼容标准 MCS-51指令系统，片内置通用8位中央处理器和Flash存储单元，AT89C2051单 片机在电子类产品中有广泛的应用。 AT89C2051是一带有2K字节闪速可编程可擦除只读存储器 （EEPROM ）的低电压，高性能 8位CMOS微处理器。它采用 ATMEL的高 密非易失存储技术制造并和工业标准MC

20、S-51指令集和引脚结构兼容。通过在 单块芯片上组合通用的CPLI和闪速存储器，ATMEL的AT89C2051是一强劲 的微型处理器，它对许多嵌入式控制应用提供一定高度灵活和成本低的解决 办法。 AT89C2051提供以下标准功能：2K字节闪速存储器，128字节RAM， 15根I/O 口，两个16位定时器，一个五向量两级中断结构，一个全双工串行 口，一个精密模拟比较器以及两种可选的软件节电工作方式。空闲方停止 CPU工作但允许 RAM、定时器/计数器、串行工作口和中断系统继续工作。掉 电方式保存 RAM内容但振荡器停止工作并禁止有其它部件的工作到下一个 硬件复位。 AT89C2051设计有2个

21、程序保密位，保密位1被编程之后，程序存 储器不能再被编程除非做一次擦除，保密位2被编程之后，程序不能被读出。 AT89C2051可以采用下面两种方法开发应用系统。 1、由于89C2051内部程序存贮器为Flash，所以修改它内部的程序 十分方便快捷，只要配备一个可以编程89C2051的编程器即可。调试人员可 以采用程序编辑-编译-固化-插到电路板中试验这样反复循环的方法，对于熟 练的MCS-51程序员来说，这种调试方法并不十分困难。但是做这种调试不能 够了解片内RAM的内容和程序的走向等有关信息。 引出来仿真2051,这种方法可以运用单步、断点的调试方法，但是仿真不够真 实，比如，2051的内

22、部模拟比较器功能, P1 口、P3 口的增强下拉能力等等。 P DIP/SOIC RSTrfVPPC 1 ivoc 3 It Jlpf J 仃C Ifl Fin 4 17| PI-S JfTAC C 5 14 3 If! 4 tnTo| pajc P3i C t 15 3 Pl 3 7 14 4 13 PS 1 fAtJJ話 * If OHD : 1曲 ml PJ7 ATB9QD5i1l AT89C2051芯片引脚图 AT89C2051的引脚图如右图所示。 1、VCC :电源电压。 2、GND :地。 3、P1 口： P1 口是一个 8位双向 I/O 口。口引脚 P 1.2P 1.7提供内部 上拉电阻，P1.0和P1.1要求外部上拉电阻。 P1.0和P1.1还分别作为片内精密 模拟比较器的同相输入(ANI0)和反相输入 (AIN1)。P1 口输出缓冲器可吸收 20mA电流并能直接驱动 LED显示。当P1 口引脚写入“1时，其可用作输入 端，当引脚P 1.2-P 1.7