2002.asm

AVR开发板范例程序,WS开发板配套_51_汇编源程序

;刀郎的<<2002年的第一场雪>>


SPK BIT P3.2

ORG 0000H
LJMP MAIN
ORG 000BH
LJMP TIMER0

MAIN:
MOV TMOD,#01H ;置CT0定时工作方式1
MOV IE,#82H  ;CPU开中断,CT0开中断
MOV R5,#00H
NEXT: MOV A,R5  ;R5存放取数的变地址
MOV DPTR,#TABLE ;DPTR置音高节拍表首地址
MOVC A,@A+DPTR ;从音高节拍表取中取音高高位参数
MOV R4,A  ;R4存放音高高位参数
INC R5
MOV A,R5
MOVC A,@A+DPTR ;从音高节拍表取中取音高低位参数
MOV R3,A  ;R3存放音高低位参数
INC R5
MOV A,R5
MOVC A,@A+DPTR ;从音高节拍表取中取节拍参数
JNZ NEXT1
MOV R5,#00H
JMP NEXT  ;唱完后循环(节拍参数为#00H表示歌曲结束)
NEXT1: MOV R2,A  ;R2存放节拍参数
LCALL SONG  ;调用音符播放程序
INC R5
SJMP NEXT  ;转入调用下一个音符
SONG:
MOV TH0,R4
MOV TL0,R3
SETB TR0  ;启动CT0(开始唱某一音符)
DELAY: MOV R1,#85H  ;节拍延时(即某一音符唱多长时间)
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:    ;定时中断程序(用于决定某一音符唱多高)
CPL SPK
MOV TH0,R4
MOV TL0,R3
RETI
TABLE: ;                音高节拍表,休止符用"FFH,FFH",结束用节拍为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