【正文】 臺函數(shù)信號發(fā)生器 ，能實(shí)現(xiàn)以下基本要求： 第一， 能產(chǎn)生方波、正弦波、三角波 三種波形，其具體的波形有按鍵選擇。 開 始T 1 置 初 值 ， 設(shè) 置 為 1 6位 定 時 模 式 （ 方 式 1 ）T 1 開 中 斷 ， 開 定 時器 ， 開 總 中 斷結(jié) 束 圖 32初始化子程序流程圖 該程序的主要功能是設(shè)置定時器的初始值，工作模式，開中斷和開定時器。 軟件設(shè)計部分： include define uchar unsigned char define uint unsigned int define key P3 define dataout P1 uchar code sin_tab[256]= // 正弦波數(shù)據(jù)表 (256 個數(shù)字 )； { 0x80,0x83,0x85,0x88,0x8A,0x8D,0x8F,0x92,0x94,0x97,0x99,0x9B,0x9E,0xA0,0xA3,0xA5, 0xA7,0xAA,0xAC,0xAE,0xB1,0xB3,0xB5,0xB7,0xB9,0xBB,0xBD,0xBF,0xC1,0xC第三章 可調(diào)低頻信號發(fā)生器的設(shè)計 3,0xC5,0xC7 0xC9,0xCB,0xCC,0xCE,0xD0,0xD1,0xD3,0xD4,0xD6,0xD7,0xD8,0xDA,0xDB,0xDC,0xDD, 0xDE,0xDF,0xE0,0xE1,0xE2,0xE3,0xE3,0xE4,0xE4,0xE5,0xE5,0xE6,0xE6,0xE7,0xE7,0xE7, 0xE7,0xE7,0xE7,0xE7,0xE7,0xE6,0xE6,0xE5,0xE5,0xE4,0xE4,0xE3,0xE3,0xE2,0xE1,0xE0, 0xDF,0xDE,0xDD,0xDC,0xDB,0xDA,0xD8,0xD7,0xD6,0xD4,0xD3,0xD1,0xD0,0xCE,0xCC, 0xCB,0xC9,0xC7,0xC5,0xC3,0xC1,0xBF,0xBD,0xBB,0xB9,0xB7,0xB5,0xB3,0xB1,0xAE,0xAC,0xAA,0xA7,0xA5,0xA3,0xA0,0x9E,0x9B,0x99,0x97,0x94,0x92,0x8F,0x8D,0x8A,0x88,0x85, 0x83,0x80,0x7D,0x7B,0x78,0x76,0x73,0x71,0x6E,0x6C,0x69,0x67,0x65,0x62,0x60,0x5D,0x5B,0x59,0x56,0x54,0x52,0x4F,0x4D,0x4B,0x49,0x47,0x45,0x43,0x41,0x3F,0x3D,0x3B,0x39,0x37, 0x35,0x34,0x32,0x30,0x2F,0x2D,0x2C,0x2A,0x29,0x28,0x26,0x25,0x24,0x23,0x22,0x21,0x20, 0x1F,0x1E,0x1D,0x1D,0x1C,0x1C,0x1B,0x1B,0x1A,0x1A,0x1A,0x19,0x19,0x19,0x19,0x19, 0x19,0x19,0x19,0x1A,0x1A,0x1A,0x1B,0x1B,0x1C,0x1C,0x1D,0x1D,0x1E,0x1F,0x20,0x21, 0x22,0x23,0x24,0x25,0x26,0x28,0x29,0x2A,0x2C,0x2D,0x2F,0x30,0x32,0x34,0x35,0x37,0x39, 0x3B,0x3D,0x3F,0x41,0x43,0x45,0x47,0x49,0x4B,0x4D,0x4F,0x52,0x54,0x56,0x59,0x5B,0x5D,0x60,0x62,0x65,0x67,0x69, 0x6C,0x6E,0x71,0x73,0x76,0x78,0x7B,0x7D, }。 //鍵值存放，查表指針； bdata sinthr。0x07。else{THHL=THHL+255。}break。} } } } /******************初始化函數(shù) ***********************/ clearmen() { key=0xff,dataout=0x00。 //裝定時初值（ T1 用）； TMOD=0X10。 //方式 1 為 16 位定時模式， T1 中斷 } 允許，開定時器，開總中斷； /**************主函數(shù) *******************/ main() { clearmen()。TH1=THHL/256。} else{dataout=thr_tab[n]。 EA=1。而三角波（正弦波）是由數(shù)據(jù)表 得到，每 個 數(shù) 據(jù) 表中 含 256 個 數(shù) 據(jù)， 一 次 中斷 取 出一 個 ， 所以 其 周期 是1us*256*256=。 圖 36 三角波和正弦波 第三章 可調(diào)低頻信號發(fā)生器的設(shè)計 圖 37 頻率增大 圖 38 頻率再增大 第三章 可調(diào)低頻信號發(fā)生器的設(shè)計 圖 39 頻率進(jìn)一步增大 圖 310 方波和正弦波 第三章 可調(diào)低頻信號發(fā)生器的設(shè)計 圖 311 方波和正弦波頻率增大 圖 312 波形的轉(zhuǎn)換 隨著頻率要求進(jìn)一步的增大，以上的頻率已經(jīng)達(dá)不到要求 。 改動的三角表（ 16 個數(shù)字）： thr_tab[64]= { 0x80,0x90,0xA0,0xB0,0xBF, 0xAF,0x9F,0x8F, 0x7F,0x6F,0x5F,0x4F,0x40,0x50,0x60,0x70, }。 以下是 信號發(fā)生器的 Protel Dxp 制版過程的簡要介紹： 第三章 可調(diào)低頻信號發(fā)生器的設(shè)計 第一， 創(chuàng)建設(shè)計工程：新建一個文件夾命名為 Signal,選擇 FileNewPCB Project菜單，創(chuàng)建一個 PCB 的工程文件，選擇 File Save Project菜單，打開 Save As 對話框，將所創(chuàng)建的工程名為 Signal. PrjPCB。最后單擊編輯區(qū)右側(cè)的 Libraries 標(biāo)簽，打開 Libraries 庫文件面板，打開元件庫下拉列表，選擇 Miscellaneous 集成庫，搜索所需要的元件，雙擊選中，然后用導(dǎo)線將它們連接成原理圖，如下圖所示： 第三章 可調(diào)低頻信號發(fā)生器的設(shè)計 圖 315 可調(diào)低頻信號發(fā)生器原理圖 第三， 進(jìn)行原理圖校驗(yàn)與分析：在完成原理圖的繪制以后，根據(jù)先前設(shè)定的設(shè)計規(guī)則對原理圖進(jìn)行校驗(yàn)，或者通過電路仿真對電路的可行性進(jìn)行分析，對電路的結(jié)構(gòu)進(jìn)行優(yōu)化。但是最后的成品卻不一定與仿真時完全一樣，因?yàn)樵趯?shí)際的應(yīng)用中有著各種各樣的條件制約著，理論和實(shí)踐是有差距的，反復(fù)的修改和測試 能給我們較多寶貴的經(jīng)驗(yàn)。 致謝 參考文獻(xiàn) [1] 張毅剛，彭喜元，董繼成．單片機(jī)原理及應(yīng)用 [M]．北京：高等教育出社 ,2021:6794. [2] 李剛、林凌 . 新概念單片機(jī)教程 [M]. 天津：天津大學(xué)出版社， [3] 李金平，沈明山，姜余祥．電子系統(tǒng)設(shè)計 [M]．北京：電子工業(yè)出版社，2021： 19,180196,398440. [4] 甘登岱． 跟我學(xué) Protel Dxp 電路設(shè)計與制版 [M]．北京：人民郵電出版社，2021： 196214. 致謝 致謝 這次畢業(yè)設(shè)計能夠制作成功，和許多人對我的幫助是分不開的，首先我要感謝我的畢設(shè)指導(dǎo)老師盧金平老師，是他對我設(shè)計的思路提供幫助，在制作困難的時候，也是他給了我鼓勵。 g an employment tribunal clai Employment tribunals sort out disagreements between employers and employees. You may need to make a claim to an employment tribunal if: ? you don39。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 about how he felt and I would like to speak to him first to find out what his experience was. Uefa has opened disciplinary proceedings against CSKA for the racist behaviour of their fans during City39。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。二十年的人生軌跡深深淺淺，突然就感覺到有些事情，非做不可了。 Then in high school, think don39。 A person39。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。 From the corner at the beginning of deep friendship。 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