【正文】 break。 smgk=0。 //無(wú)鍵按下 } P1=0X0F。 smgd=0。 smgd=1。 void Delay(uint t) //定義延 時(shí)函數(shù) { register uint bt。 圖 3 從機(jī)電路設(shè)計(jì)圖 單片機(jī)之間的通信 單片機(jī)與 MAX232 的連接如圖 所示 8 C0C1ERRORT X D3RX D2CT S8RT S7DS R6DT R4DC D1RI9P2CO M P I MT 1 I N11R1O UT12T 2 I N10R2O UT9T 1 O UT14R1I N13T 2 O UT7R2I N8C2 +4C25C1 +1C13VS+2V S 6U5M A X 2 3 2C51nF+5C61nFC71nFC81nFC91nF 圖 4 單片機(jī)與 MAX232的連接圖 模數(shù)轉(zhuǎn)換器 ADC0809 ADC0809 時(shí)序圖 圖 5 ADC0809的時(shí)序圖 4 軟件部分 簡(jiǎn)介 KeilUvision2 Keil 提供了包括 C 編譯器、宏匯編、連接器、庫(kù)管理和一個(gè)功 能強(qiáng)大的仿真調(diào)試器等在內(nèi)的完整開發(fā)方案，通過(guò)一個(gè)集成開發(fā)環(huán)境（ UVISION）將這些組合在一起。而數(shù)據(jù)的顯示則采用的是 LED 數(shù)碼管，在生活中接觸也較多 [2]。 數(shù)據(jù)采集系統(tǒng)起始于 20 世紀(jì) 50 年代， 1956年美國(guó)首 先研究了用在軍事上的測(cè)試系統(tǒng)，目標(biāo)是測(cè)試中不依靠相關(guān)的測(cè)試文。 關(guān)鍵詞 ： 數(shù)據(jù)采集 ； 89C52 單片機(jī) ； ADC0809； MAX232 The Design Of Multichannel Data Acquisition System Based On SCM Li Zhe College of Physics and Electronic Information Electronic information science and technology No: 010414055 Tutor: Zhai YanLei 1 Abstract: This article describes the hardware design and software design of the data on which based on signalchip microputer .The data collection system is the link between the digital domain and analog domain. It has an very important function. The introductive point of this text is a data to collect the system. The hardware of the system focuses on signalchip microputer .Data collection and munication control use modular design. The data collected to control with correspondence to adopt a machine 8051 to carry out. The part of hardware’s core is AT89S52, is also includes A/D conversion module, display module, and the serial interface. Slave machine is responsible for data acquisition and answering the host roads were measured the electric voltage to pass the in general use moldfew conversion of ADC0809,the realization carries on the conversion that imitates to measure the numeral to measure towards the data that collect .Then send the data to the host machine through host machine is responsible for data and display, LED digital display is responsible display the data. The software is partly programmed with VC++. The software can realize the function of monitoring and controlling the whole system. It designs much program like dataacquisition treatment,datadisplay and datamunication ect. Key words: AT89C52。在該系統(tǒng)中采用的是 8051 系列 的 單片機(jī)。 P2口接 ADC0809的 OUT1OUT8。 sbit smgd=P2^6。 smgk=1。 smgk=0。 case 8:KeyNo=3。 //改過(guò)處 TI=0。 //允許串口中斷 while(1) { Delay(100)。 case 7:putc_to_serialport(0XFE)。i120。 putc_to_SerialPo