【文章內(nèi)容簡介】 R1,60,Q1 。比較分鐘是否到 60 MOV R1,1 。分鐘到 60重新賦值 Q1:SETB EA RETI JIAN1FEN:CLR EA 。外部中斷 1，分鐘微調(diào)減 1分鐘 CJNE R1,1,Q2 。比較分鐘是否到 1 MOV R1,60 。分鐘到 1重新賦值 Q2:DEC R1 SETB EA RETI TIME0:DJNZ R2,NEXT 。計數(shù)器中斷 0， T0 溢出 20次即 1秒 MOV R2,20 。R2 重新賦值 CJNE R0,0,Q4 。比較秒鐘是否為 0 CJNE R1,0,Q3 。比較分鐘是否為 0 SETB TR1 。開啟計數(shù)器中斷 1 Q3:MOV R0,60 。秒鐘重新賦 值 DEC R1 。減少 1分鐘 DEC R0 。減少 1秒鐘 LJMP NEXT Q4:DEC R0 。減少 1秒鐘 NEXT:MOV TH0,3CH 。T0 重新賦初值 MOV TL0,0B0H RETI TIME2:PUSH ACC 。音樂程序使用的計數(shù)器中斷 1 PUSH PSW CPL CPL MOV TL1,20H MOV TH1,21H POP PSW POP ACC RETI TIME1:MOV R4,250 。動態(tài)顯示 1MS的延時子程序 Q5:NOP NOP DJNZ R4,Q5 MOV P2,00H 。關閉片選口 RET TAB:DB 0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H,80H,90H 。數(shù)碼管顯示斷碼表 TABLE1:DW 64260,64400,64580,64684,64777,64898,64968 。樂譜表 TABLE:DB 54H,64H,38H,44H,54H,18H,34H,44H,54H,64H,4CH 。音符斷碼表 DB 54H,64H,38H,44H,54H,28H,44H,14H,44H,54H,3CH DB 78H,68H,78H,38H,54H,24H,54H,64H,4CH DB 54H,64H,38H,44H,54H,28H,44H,14H,44H,54H,3CH DB 00H END ；結束 五、心得體會 經(jīng)過將近 5 個星期 的課程 學習 ，簡單帶有 LCD 顯示的音樂倒數(shù)計數(shù)器基本完成，系統(tǒng)基本功能基本實現(xiàn)，測試運行也基本正常。該系統(tǒng)基本上完成了計數(shù) 鬧時 的功能。 當然這個系統(tǒng)還存在許多有待完善的地方： ▲ 功能不夠完善，有一定瑕疵。 ▲ 在用單片機編寫音樂方面不夠熟練。 這次課程設計的時間雖然不算很長，但使我對很多東西有了更深刻的認識。平時在課堂上無法掌握的集體操作都有了一定的進步。 總結如下： ● 查閱資料和閱讀相關文獻的重要性。 ● 向同學請教的重要性，團結協(xié)作的重要性。 ● 勤動手的重要性，自己動手，豐衣足食！ 以前很多時候一遇到問題常常都會問同學，但是通過這次設計，我學會了自己努力解決困難，提高了自己解決問題的能力。 ● 對待任何事情都要有耐心和恒心，遇到問題要冷靜地思考，積極找出癥結所在，逐個解決。 ● 做事情要步步為營，不能一蹴而就，就像焊接電路，只有確保每一部都真確，才有可能實現(xiàn)整個電路正常工作。 通過本次課程設計，我更深刻的認識到了教學實踐在大學課程中的重要性，同時也發(fā)覺到了自己在學習方面存在的許多不足之 處，在以后的學習中我會努力改進這些不足，不斷提高自己的動手實踐能力。 六、參考文獻 單片機原理及接口技術 第三版（李朝青編） g an employment tribunal claim Employment tribunals sort out disagreements between employers and employees. You may need to make a claim to an employment tribunal if: ? you don39。t agree with the disciplinary action your employer has taken against you ? your employer dismisses you and you think that you have been dismissed unfairly. For more information about dismissal and unfair dismissal, see Dismissal. You can make a claim to an employment tribunal, even if you haven39。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 it. 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 u