; 單片機演奏歌曲，刀郎《2002年的第一場雪》
; 作者： chenming
; 出處：偉納電子論壇 www.willar.com


SPK BIT P3.7
 
 ORG 0000H
 LJMP MAIN
 ORG 000BH
 LJMP TIMER0
 
MAIN: 
 MOV TMOD,#01H  ;置CT0定時工作方式1
 MOV IE,#82H   ;CPU開中斷,CT0開中斷 
 MOV R5,#00H   
NEXT: MOV A,R5   ;R5存放取數的變地址
 MOV DPTR,#TABLE  ;DPTR置音高節拍表首地址
 MOVC A,@A+DPTR  ;從音高節拍表取中取音高高位參數
 MOV R4,A   ;R4存放音高高位參數
 INC R5
 MOV A,R5
 MOVC A,@A+DPTR  ;從音高節拍表取中取音高低位參數
 MOV R3,A   ;R3存放音高低位參數
 INC R5
 MOV A,R5   
 MOVC A,@A+DPTR  ;從音高節拍表取中取節拍參數 
 JNZ NEXT1   
 MOV R5,#00H   
 JMP NEXT   ;唱完后循環(節拍參數為#00H表示歌曲結束)
NEXT1: MOV R2,A   ;R2存放節拍參數
 LCALL SONG   ;調用音符播放程序
 INC R5
 SJMP NEXT   ;轉入調用下一個音符
SONG: 
 MOV TH0,R4   
 MOV TL0,R3
 SETB TR0   ;啟動CT0(開始唱某一音符)
DELAY: MOV R1,#85H   ;節拍延時(即某一音符唱多長時間)
DEL1: MOV R0,#0FFH
DEL0: NOP
 NOP
 NOP
 DJNZ R0,DEL0
 DJNZ R1,DEL1
 DJNZ R2,DELAY
 CLR TR0   ;禁止CT0(某一音符唱完后停止)
 RET
TIMER0:     ;定時中斷程序(用于決定某一音符唱多高) 
 CPL SPK
 MOV TH0,R4   
 MOV TL0,R3   
 RETI 
TABLE:                  ;音高節拍表,休止符用"FFH,FFH",結束用節拍為00H表示
DB 0FFH,0FFH,01H,0FDH, 08H,02H,0FDH, 08H,02H,0FDH, 08H,02H,0FDH, 08H,02H,0FDH, 08H,02H,0FDH, 08H,02H     
DB 0FDH, 5BH,04H,0FDH, 08H,02H,0FCH,0ABH,02H,0FCH, 0BH,02H,0FCH, 0BH,02H,0FFH,0FFH,01H,0FCH, 0BH,02H    
DB 0FCH,0ABH,02H,0FCH,0ABH,02H,0FCH,0ABH,02H,0FCH,0ABH,02H,0FCH,0ABH,04H,0FCH,0ABH,02H,0FCH,0ABH,02H            
DB 0FBH, 8FH,02H,0FCH, 0BH,02H,0FCH, 0BH,04H,0FFH,0FFH,01H        
DB 0FDH, 08H,02H,0FDH, 08H,02H,0FDH, 08H,02H,0FDH, 08H,04H,0FDH, 08H,02H,0FDH, 08H,02H    
DB 0FDH, 5BH,04H,0FDH, 08H,02H,0FCH,0ABH,04H,0FDH, 08H,06H       
DB 0FBH,08FH,02H,0FBH,08FH,02H,0FBH,08FH,02H,0FBH,08FH,02H,0FBH,08FH,02H,0FBH, 03H,02H,0FAH, 14H,02H                
DB 0FCH,0ABH,04H,0FCH,0ABH,02H,0FCH,0ABH,02H,0FCH,0ABH,02H,0FCH, 0BH,02H,0FCH, 0BH,04H     
DB 0FFH,0FFH,01H,0FDH, 08H,02H,0FDH, 08H,02H,0FDH, 08H,02H,0FDH, 08H,02H,0FDH, 08H,02H,0FDH, 08H,02H   
DB 0FDH, 5BH,04H,0FDH, 08H,02H,0FCH,0ABH,04H,0FDH, 08H,06H     
DB 0FBH,08FH,02H,0FBH,08FH,02H,0FBH,08FH,02H,0FBH,08FH,02H,0FBH,08FH,02H,0FBH, 03H,02H,0FAH, 14H,02H            
DB 0FCH,0ABH,04H,0FCH,0ABH,02H,0FCH,0ABH,02H,0FCH,0ABH,02H,0FCH, 0BH,02H,0FCH, 0BH,04H, 00H, 00H,00H   
 
 END