【正文】 R112V12V12V100R3104C6D1D2D3D4D5D6D712VOUT112VOUT2 LM324 的 5 管腳與 DAC0832 的（ IOUT2） 12 管腳相連， LM324 的 6 管腳與 DAC0832的（ IOUT1） 11 管腳相連， LM324 的 7 管腳與 DAC0832 的 REF（ 9）管腳相連 . 第一級運算放大器的作用是將 DAC0832 輸出的電 流信號轉(zhuǎn)化為電壓信號 V1，第二級運算放大器的作用是將 V1 通過反向放大電路 （ R2/R1）倍。如果再加入一個合適的電平轉(zhuǎn)換器 MAX232，串口就能能用在 RS232 和 RS485 等網(wǎng)絡中實現(xiàn)通信，或者與計算機的 COM 端口連接。 7 初 始 化開 始根 據(jù) 地 址 標 志 位 查 表w h i l e 循 環(huán)輸 出 數(shù) 字 量 給D A C 0 8 3 2 數(shù) 據(jù) 口根 據(jù) a , b , c , d , e 的 值 進 入 相應 的 w h i l e 循 環(huán)地 址 標 志 位 加 1地 址 標 志 位 是否 等 于 6 4否地 址 標 志 位 置 0相 應 延 時 （ 對 應 頻率 ） 主程序流程圖 中斷服務程序： 本程序中兩個外部中斷分別起到了控制波形和頻率的作用。用萬用表測量各 I/O 口得電壓是不是一會兒高，一會兒低。我是按照郭天翔 的那本《新概念 51 單片機 C 語言教程 入門、提高、開發(fā)、拓展全》第 130 頁的串口電路畫的圖，電路圖中 MAX232 的 TIOU1 接串口的第3 腳。 系統(tǒng)仿真波形： 9 矩形波 鋸齒波 正弦波 效果分析： 由 的頻率理論值與實際值，可知頻率在 T,2T,3T,4T,5T,6T,7T,8T 上頻率誤差很小。 。 sbit wr=P2^1。 uchar code juxing[64]={ 255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, 255,255,255,255,255,255,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 }。b0。 case 1 : {a=0,b=1,c=0,d=0,e=0。 } delay1()。 switch(p) { case 1 : pinglv=3。 case 5 : pinglv=15。 } delay1()。 EX0=1。 } while(b) { delay=pinglv。 if(k==64) k=0。 16 P0=sanjiao[k]。re clear about the terms of the agreement. It might be best to get advice from an experienced adviser, for example, at a Citizens Advice Bureau. To find your nearest CAB, including those that give advice by , click on nearest CAB. For more information about making a claim to an employment tribunal, see Employment tribunals. The (lack of) air up there Watch mCayman Islandsbased Webb, the head of Fifa39。s plaint. In a statement the Russian side added: We found no racist insults from fans of CSKA. Age has reached the end of the beginning of a word. May be guilty in his seems to passing a lot of different life became the appearance of the same day。 Then in high school, think don39。嫌惡過自己的怯懦，最終卻發(fā)現(xiàn)有很多 緣分 ，有很多錯過，好像冥冥之中真的已經(jīng)注定。 Baumgartner the disappointing news: Mission aborted. r plays an important role in this mission. Starting at the ground, conditions have to be very calm winds less than 2 mph, with no precipitation or humidity and limited cloud cover. The balloon, with capsule attached, will move through the lower level of the atmosphere (the troposphere) where our daytoday weather lives. It will climb higher than the tip of Mount Everest ( miles/ kilometers), drifting even higher than the cruising altitude of mercial airliners ( miles/ kilometers) and into the stratosphere. As he crosses the boundary layer (called the tropopause),e can expect a lot of turbulence. The supersonic descent could happen as early as Sunda. The weatheThe balloon will slowly drift to the edge of space at 120,000 feet ( Then, I would assume, he will slowly step out onto something resembling an Olympic diving platform. Below, the Earth bees the concrete bottom of a swimming pool that he wants to land on, but not too hard. Still, he39。t start planning... Those years, those days of do, finally, like youth, will end in our life. 此刻，天空是陰暗的，空氣里有著剛下過雨之后的清新因子。想要的，不想要的，界限明確，好像沒有什么可以撼動自己。 Junior high school, thought to have a crush on just means that the real growth, but over the past three years later, his writing of alumni in peace, suddenly found that isn39。s governing body, has also ordered an immediate investigation into the referee39。t appealed against the disciplinary action your employer has taken against you. However, if you win your case, the tribunal may reduce any pensation awarded to you as a result of your failure to appeal. Remember that in most cases you must make an application to an employment tribunal within three months of the date when the event you are plaining about happened. If your application is received after this time limit, the tribunal will not usually accept i. If you are worri