AT89C51英文介绍资料
AT89C51
Description
The AT89C51 is a low-power, high-performance CMOS 8-bit microcomputer with 4K bytes of Flash Programmable and Erasable Read Only Memory (PEROM). The device is manufactured using Atmel’s high density nonvolatile memory technology and is compatible with the industry standard MCS-51? instruction-set and pinout. The on-chip Flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel AT89C51 is a powerful microcomputer which provides a highly flexible and cost effective solution to many embedded control applications.
Features
?Compatible with MCS-51? Products
?4K Bytes of In-System Reprogrammable Flash Memory
–Endurance: 1,000 Write/Erase Cycles
?Fully Static Operation: 0 Hz to 24 MHz
?Three-Level Program Memory Lock
?128 x 8-Bit Internal RAM
?32 Programmable I/O Lines
?Two 16-Bit Timer/Counters
?Six Interrupt Sources
?Programmable Serial Channel
?Low Power Idle and Power Down Modes
The A T89C51 provides the following standard features: 4K bytes of Flash,128 bytes of RAM, 32 I/O lines, two 16-bit timer/counters, a five vector two-level interrupt architecture, a full duplex serial port, on-chip oscillator and clock circuitry. In addition, the AT89C51 is designed with static logic for operation down to zero frequency and supports two software selectable power saving modes. The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port and interrupt system to continue functioning. The Power-down Mode saves the RAM contents but freezes the oscillator disabling all other chip functions until the next hardware reset.
VCC
Supply voltage.
GND
Ground.
Port 0
Port 0 is an 8-bit open-drain bi-directional I/O port. As an output port, each pin can sink eight TTL inputs. When 1s are written to port 0 pins, the pins can be used as high-impedance inputs.
Port 0 may also be configured to be the multiplexed low-order address/data bus during accesses to external program and data memory. In this mode P0 has internal pullups.
Port 0 also receives the code bytes during Flash programming, and outputs the code bytes during program verification. External pullups are required during program verification.
Port 1
Port 1 is an 8-bit bi-directional I/O port with internal pullups.The Port 1 output buffers can sink/source four TTL inputs.When 1s are written to Port 1 pins they are pulled high by the internal pullups and can be used as inputs. As inputs,Port 1 pins that are externally being pulled low will source current (IIL) because of the internal pullups.Port 1 also receives the low-order address bytes during Flash programming and verification.
Port 2
Port 2 is an 8-bit bi-directional I/O port with internal pullups.The Port 2 output buffers can sink/source four TTL inputs.When 1s are written to Port 2 pins they are pulled high by the internal pullups and can be used as inputs. As inputs,Port 2 pins that are externally being pulled low will
source current (IIL) because of the internal pullups.
Port 2 emits the high-order address byte during fetches from external program memory and during accesses to external data memory that use 16-bit addresses (MOVX @DPTR). In this application, it uses strong internal pullups when emitting 1s. During accesses to external data memory that use 8-bit addresses (MOVX @ RI), Port 2 emits the contents of the P2 Special Function Register. Port 2 also receives the high-order address bits and some control signals during Flash programming and verification.
Port 3
Port 3 is an 8-bit bi-directional I/O port with internal pullups. The Port 3 output buffers can sink/source four TTL inputs.When 1s are written to Port 3 pins they are pulled high by the internal pullups and can be used as inputs. As inputs,Port 3 pins that are externally being pulled low will source current (IIL) because of the pullups. Port 3 also serves the functions of various special features of the AT89C51 as listed below:
Port 3 also receives some control signals for Flash programming and verification.
RST
Reset input. A high on this pin for two machine cycles while the oscillator is running resets the device.
ALE/PROG
Address Latch Enable output pulse for latching the low byte of the address during accesses to external memory. This pin is also the program pulse input (PROG) during Flash programming. In normal operation ALE is emitted at a constant rate of 1/6 the oscillator frequency, and may be used for external timing or clocking purposes. Note, however, that one ALE pulse is skipped during each access to external Data
Memory.
If desired, ALE operation can be disabled by setting bit 0 of SFR location 8EH. With the bit set, ALE is active only during a MOVX or MOVC instruction. Otherwise, the pin is weakly pulled high. Setting the ALE-disable bit has no effect if the microcontroller is in external execution mode.
PSEN
Program Store Enable is the read strobe to external program memory. When the AT89C51 is executing code from external program memory, PSEN is activated twice each machine cycle, except that two PSEN activations are skipped during each access to external data memory.
EA/VPP
External Access Enable. EA must be strapped to GND in order to enable the device to fetch code
from external program memory locations starting at 0000H up to FFFFH.Note, however, that if lock bit 1 is programmed, EA will be internally latched on reset. EA should be strapped to VCC for internal program executions.This pin also receives the 12-volt programming enable voltage (VPP) during Flash programming, for parts that require 12-volt VPP.
XTAL1
Input to the inverting oscillator amplifier and input to the internal clock operating circuit.
XTAL2
Output from the inverting oscillator amplifier.Oscillator Characteristics
XTAL1 and XTAL2 are the input and output, respectively,of an inverting amplifier which can be configured for use as an on-chip oscillator, as shown in Figure 1. Either a quartz crystal or ceramic resonator may be used. To drive the device from an external clock source, XTAL2 should be left unconnected while XTAL1 is driven as shown in Figure 2.There are no requirements on the duty cycle of the external clock signal, since the input to the internal clocking circuitry is through a divide-by-two flip-flop, but minimum and maximum voltage high and low time specifications must be observed.
Idle Mode
In idle mode, the CPU puts itself to sleep while all the on-chip peripherals remain active. The mode is invoked by software. The content of the on-chip RAM and all the special functions registers remain unchanged during this mode. The idle mode can be terminated by any enabled interrupt or by a hardware reset. It should be noted that when idle is terminated by a hard ware reset, the device normally resumes program execution, from where it left off, up to two machine cycles before the internal reset algorithm takes control. On-chip hardware inhibits access to internal RAM in this event, but access to the port pins is not inhibited. To eliminate the possibility of an unexpected write to a port pin when Idle is terminated by reset, the instruction following the one that invokes Idle should not be one that writes to a port pin or to external memory.
Figure 1. Oscillator Connections
Note: C1, C2 = 30 pF ± 10 pF for Crystals= 40 pF ± 10 pF for Ceramic Resonators
Figure 2. External Clock Drive Configuration
Power-down Mode
In the power-down mode, the oscillator is stopped, and the instruction that invokes power-down is the last instruction executed. The on-chip RAM and Special Function Registers retain their values until the power-down mode is terminated. The only exit from power-down is a hardware reset. Reset redefines the SFRs but does not change the on-chip RAM. The reset should not be activated before VCC is restored to its normal operating level and must be held active long enough to allow the oscillator to restart and stabilize.
Program Memory Lock Bits
On the chip are three lock bits which can be left unprogrammed (U) or can be programmed (P) to obtain the additional features listed in the table below.When lock bit 1 is programmed, the logic level at the EA pin is sampled and latched during reset. If the device is powered up without a reset, the latch initializes to a random value, and holds that value until reset is activated. It is necessary that the latched value of EA be in agreement with the current logic level at that pin in order for the device to function properly.
Programming the Flash
The AT89C51 is normally shipped with the on-chip Flash memory array in the erased state (that is, contents = FFH)and ready to be programmed. The programming interface accepts either a high-voltage (12-volt) or a low-voltage (VCC) program enable signal. The low-voltage programming mode provides a convenient way to program the AT89C51 inside the user’s system, while the high-voltage programming mode is compatible with conventional thirdparty Flash or EPROM programmers.The AT89C51 is shipped with either the high-voltage or low-voltage programming mode enabled. The respective top-side marking and device signature codes are listed in the following table.
The AT89C51 code memory array is programmed byte-by-byte in either programming mode. To program any non-blank byte in the on-chip Flash Memory, the entire memory must be erased using the Chip Erase Mode. Programming Algorithm: Before programming the AT89C51, the address, data and control signals should be set up according to the Flash programming mode table and Figures 3 and 4. To program the AT89C51, take the following steps.
1. Input the desired memory location on the address lines.
2. Input the appropriate data byte on the data lines.
3. Activate the correct combination of control signals.
4. Raise EA/VPP to 12V for the high-voltage programming mode.
5. Pulse ALE/PROG once to program a byte in the Flash array or the lock bits. The byte-write cycle is self-timedand typically takes no more than 1.5 ms. Repeat steps 1 through 5, changing the address and data for the entire array or until the end of the object file is reached.
Data Polling: The A T89C51 features Data Polling to indicate the end of a write cycle. During a write cycle, an
attempted read of the last byte written will result in the complement of the written datum on PO.7. Once the write cycle has been completed, true data are valid on all outputs, and the next cycle may begin. Data Polling may begin any time after a write cycle has been initiated.
Ready/Busy: The progress of byte programming can also be monitored by the RDY/BSY output signal. P3.4 is pulled low after ALE goes high during programming to indicate BUSY. P3.4 is pulled high again when programming is done to indicate READY.
Program Verify: If lock bits LB1 and LB2 have not been programmed, the programmed code data can be read back via the address and data lines for verification. The lock bits cannot be verified directly. Verification of the lock bits is achieved by observing that their features are enabled.
Chip Erase: The entire Flash array is erased electrically by using the proper combination of control signals and by holding ALE/PROG low for 10 ms. The code array is written with all “1”s. The chip erase operation must be executed before the code memory can be re-programmed.
Reading the Signature Bytes: The signature bytes are read by the same procedure as a normal verification of locations 030H, 031H, and 032H, except that P3.6 and P3.7 must be pulled to a logic low. The values returned are as follows.
(030H) = 1EH indicates manufactured by Atmel
(031H) = 51H indicates 89C51
(032H) = FFH indicates 12V programming
(032H) = 05H indicates 5V programming
Programming Interface
Every code byte in the Flash array can be written and the entire array can be erased by using the appropriate combination of control signals. The write operation cycle is selftimed and once initiated, will automatically time itself to completion.
All major programming vendors offer worldwide support for the Atmel microcontroller series. Please contact your local programming vendor for the appropriate software revision.
Flash Programming and Verification Waveforms - High-voltage Mode (VPP = 12V)
Flash Programming and Verification Waveforms - Low-voltage Mode (VPP = 5V)
Flash Programming and Verification Characteristics TA = 0°C to 70°C, VCC = 5.0 ± 10%
Absolute Maximum Ratings*
*NOTICE: Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods
may affect device reliability.
DC Characteristics
TA = -40°C to 85°C, VCC = 5.0V ±20% (unless otherwise noted)
Notes: 1. Under steady state (non-transient) conditions, IOL must be externally limited as follows: Maximum IOL per port pin: 10 mA
Maximum IOL per 8-bit port: Port 0: 26 mA
Ports 1, 2, 3: 15 mA
Maximum total IOL for all output pins: 71 mA
If IOL exceeds the test condition, VOL may exceed the related specification. Pins are not guaranteed to sink current greater than the listed test conditions.
2. Minimum VCC for Power-down is 2V.
AC Characteristics
Under operating conditions, load capacitance for Port 0, ALE/PROG, and PSEN = 100 pF; load capacitance for all other outputs = 80 pF.
External Program and Data Memory Characteristics
External Program Memory Read Cycle
External Data Memory Read Cycle
External Data Memory Write Cycle
External Clock Drive Waveforms
External Clock Drive
Serial Port Timing: Shift Register Mode Test Conditions
(VCC = 5.0 V ±20%; Load Capacitance = 80 pF)
Shift Register Mode Timing Waveforms
AC Testing Input/Output Waveforms(1)
Note: 1. AC Inputs during testing are driven at VCC - 0.5V for a logic 1 and 0.45V for a logic 0. Timing measurements are made at VIH min. for a logic 1 and VIL max. for a logic 0.Float Waveforms(1)
Note: 1. For timing purposes, a port pin is no longer floating when a 100mV change from load voltage occurs. A port pin begins to float when 100mV change from the loaded VOH/VOL level occurs.
英文自我介绍合集(大黄蜂资料大集合)
General Introduction I am a third year master major in automation at Shanghai Jiao Tong University, P. R. China. With tremendous interest in Industrial Engineering, I am writing to apply for acceptance into your Ph.D. graduate program. Education background In 1995, I entered the Nanjing University of Science & Technology (NUST) -- widely considered one of the China?s best engineering schools. During the following undergraduate study, my academic records kept distinguished among the whole department. I was granted First Class Prize every semester,In 1999, I got the privilege to enter the graduate program waived of the admission test. At the period of my graduate study, my overall GPA(3.77/4.0) ranked top 5% in the department. In the second semester, I became teacher assistant that is given to talented and matured students only. This year, I won the Acer Scholarship as the one and only candidate in my department, which is the ultimate accolade for distinguished students endowed by my university. Presently, I am preparing my graduation thesis and trying for the honor of Excellent Graduation Thesis. Research experience and academic activity When a sophomore, I joined the Association of AI Enthusiast and began to narrow down my interest for my future research. With the tool of OpenGL and Matlab, I designed a simulation program for transportation scheduling system. It is now widely used by different research groups in NUST. I assumed and fulfilled a sewage analysis & dispose project for Nanjing sewage treatment plant. This was my first practice to convert a laboratory idea to a commercial product.
中国春节的英文简介
Spring Festival is on the traditional Chinese festivals.People used to call it "the Lunar New Year".It always starts between january the first and february the twentie its the most important festival in China Spring Festival The most important festival in China is the Spring Festival. It is said that the Spring Festival evolved from an activity known as the Winter Sacrifice. It was a custom practiced by the people of primitive society. The Spring Festival marks the beginning of the Chinese Lunar New Year,so the first meal is rather important. People usually eat Jiaozi or dumplings shaped like a crescent moon on that special day. As for recreational activities during the Sping Festival, the Dragon Dance and Lion Dance are traditionally performed . One legend goes that the beast Nian had a very big mouth that would swallow a great many people with one bite. People were very scared. 传说有一个叫“年”的怪兽，有一个大嘴，能一口吞下很多人。人们都很怕它。The custom of putting up red paper and firing fire-crackers is to scare away Nian. 贴红纸和方鞭炮的习俗就是为了吓跑年。 However, people today have long forgotten why they are doing all this, except that they feel the color and the sound add to the excitement of the celebration. 但是，现在人们大多忘记了为什么这么做的原因，只是觉得色彩和响声增加了过节的气氛罢了！ Traditions of Chinese New Year Before New Year's Eve The celebration actually starts on New Year's Eve with the family reunion dinner. By New Year's Eve, you should have done the following: Clean the entire home to get rid of all the things that are associated with the old year. Put away all brooms and brushes. Pay all your debts. Resolve differences with family members, friends, neighbors and business associates. Buy the following: Red money envelopes, Oranges and/or tangerines, Fill a "Cheun hup(a circular red tray separated in eight compartments) with melon seedslotuschocolate coinsnuts etc. Flowers (especially plum blossoms, peach blossoms, water lilies), A new set of clothes and shoes for children, preferably something red or orange. Get new dollar bills from the bank. Insert the new dollar bills into the red envelopes. Now the red envelope is called a lai see or lucky money envelope. On New Year's Eve
春节中英文简介
春节是中国传统的新年，它从中国农历正月的第一天开始到第十五天结束，一共十五天。春节也预示着春天的来临。在新年的前一段时间，人们开始准备食物、买新衣服和打扫房间。很多家庭会在门上贴上春联。按照习俗，所有的准备是希望新的一年会带来幸福和好运。在中国，红色是好运的象征。 Spring Festival is the Chinese New Year. It starts on the 1st and ends on the 15th of lunar January. Spring Festival celebrates the coming of spring. Several days before the New Year, every family prepares rich food, buys new clothes, and cleans the house. Many families buy or write Spring Festival couplets and put them on the door. People believe that everything must be new and clean for the Spring Festival celebration so that the New Year will bring happiness and good luck. In China, red represents luck.
在除夕夜，人们通常要到十二点以后才睡觉，这叫“守岁”，“岁”也是“年”的意思，通常人们用岁表示年龄，即一年是一岁。守岁是送走旧的一年迎来新的一年，所以在晚上12点时，很多家庭都会放鞭炮以示新的一年的到来。新年的第一天，也就是初一，人们基本上都呆在家里。从年初二开始，人们起的很早，互相拜年并致以新年的祝福等。 On New Year’s eve, people set off fireworks from around midnight to see out the end of the previous year and welcome in the New Year, called “shǒusuì” .“suì”means year. On the first day of the New Year people usually stay at home. On the 2nd day people get up early and exchange New Year’s greetings with relatives, friends, neighbors, etc.
名家资料英文介绍：奥斯卡·王尔德 Oscar Wilde
Oscar Wilde (1854-1900), Irish poet and dramatist whose reputation rests on his comic masterpieces Lady Windermere's Fan温夫人的扇子(1892) and The Importance of Being Earnest认真的重要性(1895). Among Wilde's other best-known works are his only novel The Picture of Dorian Gray多利安?格雷的画像(1891) and his fairy tales especially "The Happy Prince." Wilde was born on October 16, 1854 in Dublin to unconventional parents - his mother Lady Jane Francesca Wilde (1820-96), was a poet and journalist. His father was Sir William Wilde, an Irish antiquarian古物研究者,收集古物者（antiques）, gifted writer, and specialist in diseases of the eye and ear. Wilde studied at Portora Royal School, Enniskillen, County Fermanagh (1864-71), Trinity College, Dublin (1871-74) and Magdalen College, Oxford (1874-78). In 1878 Wilde received his B.A. and in the same year he moved to London. His lifestyle and humorous wit soon made him the spokesman for
关于春节的英文介绍
关于春节的英文介绍 Spring Festival ○1The Spring Festival is the most important festival for the Chinese people and is when all family members get together, just like Christmas in the West. All people living away from home go back, becoming the busiest time for transportation systems of about half a month from the Spring Festival. Airports, railway stations and long-distance bus stations are crowded with home returnees. (春节是中国人民最重要的节日，所有家庭成员聚在一起，在西方圣诞节一样。所有远离家乡的人都要回家，成为了为期半个月左右的运输系统最繁忙的时间——春运。机场，火车站和长途巴士站都挤满了回家的人。) ○2The Spring Festival falls on the 1st day of the 1st lunar month, often one month later than the Gregorian calendar. It originated in the Shang Dynasty (c. 1600 BC-c. 1100 BC) from the people's sacrifice to gods and ancestors at the end of an old year and the beginning of a new one. （春节落在正月的第一天，往往比公历晚一个月。它起源于商朝（西元1600 BC-C。公元前1100年）从人民祭祀神灵和祖先，在旧的一年结束和一个新的开始。） ○3Strictly speaking, the Spring Festival starts every year in the early days of the 12th lunar month and will last till the mid-1st lunar month of the next year. Of them, the most important days are Spring Festival Eve and the first three days. The Chinese government now stipulates people have seven days off for the Chinese Lunar New Year. （严格地说，春节是指从腊月初开始一直到第二年中旬的一个月。其中，最重要的日子是除夕和一年的前三天。现在中国政府规定，人民在中国农历新年有七天的休假。） ○4Many customs accompany the Spring Festival. Some are still followed today, but others have weakened. （春节的时候有不少传统习俗。有的人至今还在保持，不过有的人已经慢慢淡化了这种习俗。） ○5On the 8th day of the 12th lunar month, many families make laba porridge, a delicious kind of porridge made with glutinous rice, millet, seeds of Job's tears, jujube berries, lotus seeds, beans, longan and gingko. （腊月的第8天，许多家庭做腊八粥，糯米，小米，薏苡种子，红枣浆果，莲子，豆类，龙眼，银杏制成美味的粥样。） ○6The 23rd day of the 12th lunar month is called Preliminary Eve（小年）. At this time, people offer sacrifice to the kitchen god. Now however, most families make delicious food to enjoy themselves. （腊月23日，被称为小年。在这个时候，人们祭祀灶神。但是现在，大多数家庭做出美味的食物来过节。） ○7After the Preliminary Eve, people begin preparing for the coming New Year. This is called "Seeing the New Year in". （过了小年之后，人们开始为新年做准备。这被称为“看得见的新年”。） ○8Store owners are busy then as everybody goes out to purchase necessities for the New Year. Materials not only include edible oil, rice, flour, chicken, duck, fish and meat, but also fruit, candies and kinds of nuts. What's more, various decorations, new clothes and shoes for the children as well as gifts for the elderly, friends and relatives, are all on the list of purchasing. （商店老板都那么忙，因为每个人都出去购买生活必需品新年。材料不仅包括食用油，大米，面粉，鸡，鸭，鱼，肉，而且水果，糖果和各种坚果。更重要的是，各种装饰，新衣服和鞋的儿童以及老人的礼物，朋友和亲戚，所有的采购清单。） ○9Before the New Year comes, the people completely clean the indoors and outdoors of their homes as well as their clothes, bedclothes and all their utensils. （在新的一年到来之际，人们彻
华为英语自我介绍
竭诚为您提供优质文档/双击可除 华为英语自我介绍 篇一：【内部资料】华为英文面试题 【内部资料】华为英文面试题 我为各位整理出英文面试最常见的五大问题，并且提醒各位一些回答的技巧，希望大家能针对这些问题多演练，当成练习英文面试的重点。 问题一：couldyoupleasedescribeyourself?（能否请你形容一下自己？） 这个问题，一来是想要了解你是什么样的人，二来是想看看你是否知道如何重点式地自我简介。在回答时，要针对应征工作的性质来凸显自己的特色，可以多用形容词，并且引用过去的工作经验，但是不必提及公司组织的名称，再者，你还可以谈谈未来的生涯规画；但如果你是个社会新鲜人，就可以谈谈在校时的丰功伟业。比方说，今天你打算去应征行销的职务，你就可以说︰ Iamcreativeandmotivated.Iworkedonseveralmajormarket ingprojectswithpositiveresults.Iamnowlookingforacha
llengingmarketingpositioninanestablishedcompany.（我有创意、又积极。曾负责数项大型的行销项目，皆有成效。我现在希望在一家深具规模的公司内，担任有挑战性的行销职务。） 问题二：whydoyouthinkweshouldemployyou?（你认为我们为何要雇用你？） 雇主问此问题，希望你试图证明自己是最佳人选，并且测试你是否熟悉应征职务的工作内容。回答时，要迎合该公司对该职务的期望，不过切记别给人狂妄自大的印象。假设你今天要应征机械工程的工作，你就可以说︰Iamsuitablefortheposition,notonlybecauseIhaveamaste rsdegreeinmechanicalengineering,butalsobecauseIhave workedinthisfieldformorethanfiveyears.Ibelievethatm yexperiencecanbeputtouseinfurtherdevelopingyourbusi ness.（我很适合该职位，不只因为我有机械工程学的硕士学位，更因为我在该产业已经有五年多的工作经验，我相信，我的经验可以派上用场，进一步推动贵公司的事业。）问题三：whatclassesdidyoulikebestbackinschool?（在学校你最喜欢哪门课？） 此时，雇主想了解你的学习能力，以及你有兴趣的专业课程是否跟工作扯得上边；此外，个人在求学过程的好恶，会反应在不同的工作岗位上。回答时，一定要表示自己以好
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