畢業(yè)設(shè)計(jì)-基于stc89c52單片機(jī)音樂(lè)盒設(shè)計(jì)(文件)
【正文】 次，就是在此次 課程 設(shè)計(jì)中關(guān)系到了音樂(lè)的一些基礎(chǔ)知識(shí)，音樂(lè)是由不同的音符組成，不同的音符對(duì)應(yīng)著不同的頻率產(chǎn)生，產(chǎn)生有規(guī)律的頻率樂(lè)音。?參考文獻(xiàn) [1] 李廣 弟 .《單片機(jī)基礎(chǔ)》 .北京航空航天大學(xué)出版社 ,1999 ?附錄： PCB 布局圖 音樂(lè)播放器程序如下： include sbit speaker=P2^0。 unsigned char flagd=0。 // 音階頻率表 低八位 code unsigned char FREQL[]={ 0x42,0xC1,0x17,0xB6,0xD0,0xD1,0xB6, 0x21,0xE1,0x8C,0xD8,0x68,0xE9,0x5B,0x8F, //1,2,3,4,5,6,7,8,i 0xEE,0x44, 0x6B,0xB4,0xF4,0x2D, 0x47,0x77,0xA2,0xB6,0xDA,0xFA,0x16, }。t1t。 } } TR0=0。x) for(y=110。 speaker=!speaker。 } void song() { TH0=timer0h。 ? } void main(void) { unsigned char k,i。//IE=0x82 //CPU 開(kāi)中斷 ,CT0開(kāi)中斷 P1=0xff。 } } if(key_next==0) { delay_key(8)。 timer0l=FREQL[k]。 } if(j==2) { k=music2[i]+7*music2[i+1]1。 i=i+3。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 worried about how the time limits apply to you, take advice from one of the anisations listed under Further help. Employment tribunals are less formal than some other courts, but it is still a legal process and you will need to give evidence under an oath or affirmation. Most people find making a claim to an employment tribunal challenging. If you are thinking about making a claim to an employment tribunal, you should get help straight away from one of the anisations listed under Further help. If you are being represented by a solicitor at the tribunal, they may ask you to sign an agreement where you pay their fee out of your pensation if you win the case. This is known as a damagesbased agreement. In England and Wales, your solicitor can39。s 150th anniversary celebrations and will attend City39。s governing body, has also ordered an immediate investigation into the referee39。或許是愧疚于自己似乎把轉(zhuǎn)瞬即逝的很多 個(gè)不同的日子過(guò)成了同一天的樣子；或許是追溯過(guò)去，對(duì)自己那些近乎偏執(zhí)的怪異信念的醒悟，這些天以來(lái)，思緒一直很凌亂，在腦海中不斷糾纏。 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。t remember his appearance. 童年時(shí)，覺(jué)得壓歲錢和新衣服是過(guò)年必備，但是隨著年齡的推進(jìn)，會(huì)越來(lái)越發(fā)現(xiàn)，那些東西根本就可有可無(wú)；初中時(shí)，以 為要有一場(chǎng)暗戀才意味著真正的成長(zhǎng)，但三年過(guò)去后，自己心平氣和的寫同學(xué)錄的時(shí)候，突然就發(fā)現(xiàn)是不是真正的成長(zhǎng)了，好像并沒(méi)有那么重要了；然后到了高中，覺(jué)得非要吐露出自己的心聲才能為高中生涯里的懵懂情愫劃上一個(gè)句點(diǎn)，但畢業(yè)晚會(huì)的時(shí)候最終還是被梗塞在了咽喉，后來(lái)再次站在他曾經(jīng)揮汗如雨的球場(chǎng)，看著他投過(guò)籃球的球框時(shí)，突然間發(fā)現(xiàn)自己已經(jīng)想不起他的容顏。想要的，不想要的，界限明確，好像沒(méi)有什么可以撼動(dòng)自己。 ?At the moment, the sky is dark, the air is fresh factor after just rained. Suddenly thought of blue plaid shirt。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(guò)雨之后的清新因子。s not needed. Instead, he plans to deploy his 270squarefoot (25squaremeter) main chute at an altitude of around 5,000 feet (1,524 meters). In order to deploy this chute successfully, he will have to slow to 172 mph (277 kph). He will have a reserve parachute that will open automatically if he loses consciousness at mach speeds. Even if everything goes as planned, it won39。 Baumgartner the disappointing news: Mission aborted. r plays an important role in th
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