闡述了一個由上位PC機(jī)和AT89C52下位單片機(jī)組成的主從分布式溫度巡回檢測系統(tǒng)。主從機(jī)采用RS-485 串行通訊標(biāo)準(zhǔn)進(jìn)行通信，可在下位單片機(jī)實現(xiàn)基本的溫度數(shù)據(jù)巡回檢測基礎(chǔ)上，由上位PC機(jī)實現(xiàn)綜合處理功能或擴(kuò)展為遠(yuǎn)程操作。整個系統(tǒng)具有巡檢速度快，擴(kuò)展性好的特點(diǎn)。 Abstract: In this paper,a top PC and AT89C52 under-bit microcontrollers from the main component of the tour distributed temperature detection system is presented. Master and slave can use RS-485 serial communication standards for communications.Based on next-bit machine for basic goods temperature detected data Tour, the top can achieve the integrated treatment of PC functions or for the expansion of long-distance operation. The entire inspection system is fast, expansion.
上傳時間： 2013-10-13
上傳用戶：zhoujunzhen
針對眾多低成本數(shù)據(jù)采集需求，采用帶有片上USB控制器和D/A轉(zhuǎn)換器的混合信號微處理器C8051F340，設(shè)計了一款可通過USB接口和LabVIEW圖形用戶界面實現(xiàn)與PC機(jī)聯(lián)機(jī)的數(shù)據(jù)采集器，同時借助系統(tǒng)的SD卡存儲獨(dú)立實現(xiàn)現(xiàn)場長時間采集數(shù)據(jù)。該數(shù)據(jù)采集器成本低，結(jié)構(gòu)簡單，體積小，已成功用于工業(yè)現(xiàn)場。 Abstract: Aiming at the need of low cost data acquisition, a data acquisition device is designed based on C8051F340 which is a mixed-signal microcontroller and integrates USB controller and A/D controller on a chip.The data acquisition device which can combine with PC by USB interface and LabVIEW graphical user interface,can realize data acquisition. At the same time,it can be solely run a long time in virtue of SD card in field.The date aequisition device features low cost,simple structure and little sharp, and it has been used in industry field.
標(biāo)簽： C8051F340 數(shù)據(jù) 集器設(shè)計
上傳時間： 2014-05-31
上傳用戶：1109003457
介紹了電力操作電源與智能電池巡檢系統(tǒng)的特點(diǎn)，給出了一種基于超低功耗單片機(jī)MSP430 F149針對中小型變電站自動化運(yùn)行的專用設(shè)備的基本設(shè)計原理及實現(xiàn)方法，最后給出了詳細(xì)硬件構(gòu)成和軟件實現(xiàn)。該系統(tǒng)能滿足中小型變電站安全、可靠、自動運(yùn)行的要求，并通過與上位機(jī)的串行通信實現(xiàn)變電站的遠(yuǎn)程管理和控制。 Abstract: The characters of the intelligent battery data logging system of the electric operation power are introduced.The basic design principle and the implemented methods of the special equipment which only designed for the middle or small transformer substation based on MSP430F149 are prescribed. Finally, the hardware block diagram and the software flow chart are also given. The function that the system finally needs to realize can basically meet with the middle or small transformer substation’s satisfy, reliably,and automatic running.And it can also realize the transformer substation long-distance management and control by serial communicating with the host computer.
上傳時間： 2013-11-25
上傳用戶：黃華強(qiáng)
The SN65LBC170 and SN75LBC170 aremonolithic integrated circuits designed forbidirectional data communication on multipointbus-transmission lines. Potential applicationsinclude serial or parallel data transmission, cabledperipheral buses with twin axial, ribbon, ortwisted-pair cabling. These devices are suitablefor FAST-20 SCSI and can transmit or receivedata pulses as short as 25 ns, with skew lessthan 3 ns.These devices combine three 3-state differentialline drivers and three differential input linereceivers, all of which operate from a single 5-Vpower supply.The driver differential outputs and the receiverdifferential inputs are connected internally to formthree differential input/output (I/O) bus ports thatare designed to offer minimum loading to the buswhenever the driver is disabled or VCC = 0. Theseports feature a wide common-mode voltage rangemaking the device suitable for party-lineapplications over long cable runs.
上傳時間： 2013-10-13
上傳用戶：ytulpx
LLCR Pin Socket Testing with the Model 3732 High Density Matrix Card Computer processors (CPUs) today have come a long way from the computer processors of the past. They draw more power, run at lower voltages, and have more pins than ever before.
標(biāo)簽： Testing Socket LLCR with
上傳時間： 2013-10-24
上傳用戶：whenfly
C51 中的關(guān)鍵字關(guān)鍵字 用途 說明auto 存儲種類說明 用以說明局部變量，缺省值為此break 程序語句 退出最內(nèi)層循環(huán)case 程序語句 Switch 語句中的選擇項char 數(shù)據(jù)類型說明 單字節(jié)整型數(shù)或字符型數(shù)據(jù)const 存儲類型說明 在程序執(zhí)行過程中不可更改的常量值continue 程序語句 轉(zhuǎn)向下一次循環(huán)default 程序語句 Switch 語句中的失敗選擇項do 程序語句 構(gòu)成do..while 循環(huán)結(jié)構(gòu)double 數(shù)據(jù)類型說明 雙精度浮點(diǎn)數(shù)else 程序語句 構(gòu)成if..else 選擇結(jié)構(gòu)enum 數(shù)據(jù)類型說明 枚舉extern 存儲種類說明 在其他程序模塊中說明了的全局變量flost 數(shù)據(jù)類型說明 單精度浮點(diǎn)數(shù)for 程序語句 構(gòu)成for 循環(huán)結(jié)構(gòu)goto 程序語句 構(gòu)成goto 轉(zhuǎn)移結(jié)構(gòu)if 程序語句 構(gòu)成if..else 選擇結(jié)構(gòu)int 數(shù)據(jù)類型說明 基本整型數(shù)long 數(shù)據(jù)類型說明 長整型數(shù)register 存儲種類說明 使用CPU 內(nèi)部寄存的變量return 程序語句 函數(shù)返回short 數(shù)據(jù)類型說明 短整型數(shù)signed 數(shù)據(jù)類型說明 有符號數(shù)，二進(jìn)制數(shù)據(jù)的最高位為符號位sizeof 運(yùn)算符 計算表達(dá)式或數(shù)據(jù)類型的字節(jié)數(shù)static 存儲種類說明 靜態(tài)變量struct 數(shù)據(jù)類型說明 結(jié)構(gòu)類型數(shù)據(jù)swicth 程序語句 構(gòu)成switch 選擇結(jié)構(gòu)typedef 數(shù)據(jù)類型說明 重新進(jìn)行數(shù)據(jù)類型定義union 數(shù)據(jù)類型說明 聯(lián)合類型數(shù)據(jù)unsigned 數(shù)據(jù)類型說明 無符號數(shù)數(shù)據(jù)void 數(shù)據(jù)類型說明 無類型數(shù)據(jù)volatile 數(shù)據(jù)類型說明 該變量在程序執(zhí)行中可被隱含地改變while 程序語句 構(gòu)成while 和do..while 循環(huán)結(jié)構(gòu)ANSIC 標(biāo)準(zhǔn)關(guān)鍵字關(guān)鍵字 用途 說明bit 位標(biāo)量聲明 聲明一個位標(biāo)量或位類型的函數(shù)sbit 位標(biāo)量聲明 聲明一個可位尋址變量
標(biāo)簽： C51
上傳時間： 2013-10-08
上傳用戶：waves_0801
匯編器在微處理器的驗證和應(yīng)用中舉足輕重，如何設(shè)計通用的匯編器一直是研究的熱點(diǎn)之一。本文提出了一種開放式的匯編器系統(tǒng)設(shè)計思想，在匯編語言與機(jī)器語言間插入中間代碼CMDL（code mapping description language）語言，打破匯編語言與機(jī)器語言的直接映射關(guān)系，由此建立起一套描述匯編語言與機(jī)器語言的開放式映射體系。基于此開放式映射體系開發(fā)了一套匯編器系統(tǒng)，具有較高層次上的通用性和可移植性。【關(guān)鍵詞】指令集，CMDL，匯編器，開放式 Design of Retargetable Assembler System Liu Ling Feng Wen Nan Wang Ying Chun Jiang An Ping Ji Li Jiu IME of Peking University, 100871【摘要】An assembler plays a very important role in the field of microprocessor verifications and applications, thus how to build a retargetable assembler system has been a hotspot in this field for long time. This paper presents a new method about the retargetable assembler system design.It provides a kind of language CMDL, code mapping description language. During the process of assembling, assembler languages are firstly translated to CMDL, and then mapped to the machine codes. In an other word, CMDL is inserted between assembler languages and machine codes during the translation procedure. As a medium code, CMDL has a lot of features, such as high extraction, strong descript capabilities. It can describe almost all attributes of assembler languages. By breaking the direct mapping relationship between assembler languages and machine codes, the complexities of machine codes are hided to the users, therefore, the new retargetable assembler system has higher retargetable level by converting the mapping from assembler languages and machine codes to assembler languages and CMDL, and implementationof it becomes easier. Based on the new mapping system structure, a retargetable assemblersystem is developed. It proved the whole system has good retargetability and implantability.【關(guān)鍵詞】instruction set, symbol table, assembler, lexical analysis, retargetability
上傳時間： 2013-10-10
上傳用戶：meiguiweishi
keil 使用筆記:在Memory窗口上輸入address_type:address才能看到正確地址的變量debug～perfermance analyzer加入要察看的模塊名稱，然后view～perfermance analyzer window 可以察看各個模塊運(yùn)行時間①Display address_type:address B:Bit address C:Code Memory Bx:Code Bank D D：80H 命令可以查看特殊寄存器 data D I：0 命令可以查看內(nèi)部RAM數(shù)據(jù)iData； D X：0 命令可以查看外部RAM數(shù)據(jù)xData； ②R1 //顯示R1 register ~R1 //顯示變量R1 R1 = R7 //對寄存器Rx操作R1 = --R7 R1 = 0x20 ③main //顯示main()的開始地址d main //顯示main()的代碼④向RAM.ROM中寫數(shù)據(jù)Enter data_type address_type:address expr,expr.... data_type:int char double float long E char data:0x20 1,2,3,4 //向data區(qū)0x20開始的地址寫1,2,3,4 變量放在RAM的30H，要把定義放在main前面!另外特別注意，內(nèi)部RAM通常供C程序存放中間變量等，所以一定要看看編譯后的程序中是否存在存儲單元沖突的情況，比如如果程序中 使用了別的寄存器組的話，08-1FH單元就不能用了unsigned long data i _at_ 0x30
上傳時間： 2013-11-05
上傳用戶：dongqiangqiang
這一顆，我們學(xué)習(xí)如何讓跑馬燈自動按照我們預(yù)定的順序進(jìn)行。這種控制在工控場合經(jīng)常用到。這個程序里，我們預(yù)先定義了一個變化的順序speedcode，每跑一圈燈就根據(jù)預(yù)定設(shè)置的表格數(shù)據(jù)來決定下一圈的跑馬速度。這樣我們就實現(xiàn)了按照預(yù)定的順序自動變化運(yùn)行。請看代碼：-----------------------------------#define uchar unsigned char //定義一下方便使用#define uint unsigned int#define ulong unsigned long#include <reg52.h> //包括一個52 標(biāo)準(zhǔn)內(nèi)核的頭文件sbit P10 = P1^0; //頭文件中沒有定義的IO 就要自己來定義了sbit P11 = P1^1;sbit P12 = P1^2;sbit P13 = P1^3;bit ldelay=0; //長定時溢出標(biāo)記,預(yù)置是0uchar speed=10; //設(shè)置一個變量保存跑馬燈的移動速度uchar code speedcode[10]={3,1,5,12,3,20,2,10,1,4}; //10 個預(yù)定義的速度char code dx516[3] _at_ 0x003b;//這是為了仿真設(shè)置的//可編程自動控制跑馬燈void main(void) // 主程序{uchar code ledp[4]={0xfe,0xfd,0xfb,0xf7};//預(yù)定的寫入P1 的值uchar ledi; //用來指示顯示順序uchar i;RCAP2H =0x10; //賦T2 的預(yù)置值0x1000，溢出30 次就是1 秒鐘RCAP2L =0x00;TR2=1; //啟動定時器ET2=1; //打開定時器2 中斷EA=1; //打開總中斷
上傳時間： 2013-11-20
上傳用戶：ming529
//遙控解碼子程序，LC7461，用戶碼為11C//external interrupt0void isr_4(){ unsigned char r_count;//定義解碼的個數(shù) unsigned long use_data=0;//定義16位的用戶碼，只用到13位 unsigned long use_code=0;//定義16位的用戶反碼，只用到13位 unsigned long data=0;//定義16位數(shù)據(jù)碼，包括8位數(shù)據(jù)碼和反碼 unsigned char data_h=0;//數(shù)據(jù)反碼 unsigned char data_l=0;//數(shù)據(jù)碼 _clrwdt();// _delay(7000);//7461解碼，延時7000// _delay(7000);//7461解碼，延時7000//_delay(7000);//7461解碼，延時7000 if(remote==1) goto error; while(remote==0);//wait to high //_delay(9744);count_delay=0; while(count_delay<143); if(remote==1) goto error; /////用戶碼解碼use_data//////////add////////////////////////// for(r_count=13;r_count>0;r_count--) { while(remote==0);//wait to high count_delay=0; while(count_delay<24);//_delay(1680); _c=remote; if(_c==1) { _lrrc(&use_data); count_delay=0; while(count_delay<32);//_delay(2200);//wait to low } else _lrrc(&use_data); } _nop(); //if(remote==1) //_delay(1680);//wait to low while(remote==1);//wait to low _nop(); ////////用戶碼解碼finish/////////add/////////add//////// /////用戶碼反碼解碼use_code//////////add////////////////////////// for(r_count=13;r_count>0;r_count--) { while(remote==0);//wait to high count_delay=0; while(count_delay<24);//_delay(1680); _c=remote; if(_c==1) { _lrrc(&use_code); count_delay=0; while(count_delay<32);//_delay(2200);//wait to low } else _lrrc(&use_code); } _nop(); //if(remote==1) // _delay(1680);//wait to low while(remote==1);//wait to low _nop(); ////////用戶碼反碼解碼finish/////////add/////////add//////// ////數(shù)據(jù)碼解碼開始////data_l為用戶碼，data_h為數(shù)據(jù)碼反碼//////////// for(r_count=16;r_count>0;r_count--) { while(remote==0);//wait to high count_delay=0; while(count_delay<24);//_delay(1680); _c=remote; if(_c==1) { _lrrc(&data); count_delay=0; while(count_delay<32);//_delay(2200);//wait to low } else _lrrc(&data); } ////數(shù)據(jù)碼解碼結(jié)束//////////////////////////////////////////////// data_l=data; data_h=data>>8; ///用戶碼////// use_data>>=3; use_code>>=3; use_code=~use_code; //////// ////如果用戶碼等與0x11c并且數(shù)據(jù)碼和數(shù)據(jù)反碼都校驗一致，解碼成功 //if((~data_h==data_l)&&use_data==0x11c)//使用用戶碼 //跳過用戶碼 if(~data_h==data_l)//如果數(shù)據(jù)碼和數(shù)據(jù)反碼（取反后）相等，解碼正確 { _nop(); r_data=data_l;//r_data為解出的最終數(shù)據(jù)碼 } //否則解碼不成功 _nop(); _nop();error: //r_data=nocode; _nop(); _nop(); _nop();}
上傳時間： 2014-03-27
上傳用戶：shenlan
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