YS1: MOV R4,#20 ;延时子程序1，精确延时882微秒 D1:
MOV R5,#20 DJNZ R5,$ DJNZ R4,D1 RET
YS2: MOV R4,#2;延时程序3，精确延时1000微秒 D3: MOV R5,#248 TAB:
END
DB 11H,7FH DB 12H,0BFH DB 13H,0DFH DB 14H,0EFH DB 15H,0F7H DB 16H,0FBH DB 17H,0FDH DB 18H,0FEH DB 19H,0FCH DB 10H,0F8H DJNZ R5,$ DJNZ R4,D3 RET
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