图1 图2   ORG  0000H
        MOV 30H,#1          
        MOV 31H,#2     
        MOV 32H,#0
        MOV 33H,#0
        MOV 34H,#0
        MOV 35H,#0
        MOV TMOD,#01         
XS0:    SETB TR0           
        MOV TH0,#00H      
        MOV TL0,#00H
XS:
        MOV 40H,#0FEH     
        MOV DPTR,#TAB     
        MOV P2,40H        
        MOV A,30H         
        MOVC A,@A+DPTR    
        MOV P0,A           
        LCALL YS1MS        
        MOV P0,#0FFH       
        MOV A,40H          
        RL A                
        MOV 40H,A           
        MOV P2,40H
        MOV A,31H        
        ADD A,#10          
        MOVC A,@A+DPTR    
        MOV P0,A
        LCALL YS1MS
        MOV P0,#0FFH
        MOV A,40H
        RL A
        MOV 40H,A
        MOV P2,40H
        MOV A,32H
        MOVC A,@A+DPTR  
        MOV P0,A
        LCALL YS1MS
        MOV P0,#0FFH
        MOV A,40H
        RL A
        MOV 40H,A
        MOV P2,40H
        MOV A,33H
        ADD A,#10
        MOVC A,@A+DPTR
        MOV P0,A
        LCALL YS1MS
        MOV P0,#0FFH
        MOV A,40H
        RL A
        MOV 40H,A
        MOV P2,40H
        MOV A,34H
        MOVC A,@A+DPTR
        MOV P0,A
        LCALL YS1MS
        MOV P0,#0FFH
        MOV A,40H
        RL A
        MOV 40H,A
        MOV P2,40H
        MOV A,35H
        MOVC A,@A+DPTR
        MOV P0,A
        LCALL YS1MS
        MOV P0,#0FFH
        MOV A,40H
        RL A
        MOV 40H,A
        JB TF0,JIA        
        JNB P1.0,P100       
        JNB P1.1,P1000       
        JNB P1.2,P10000      
        AJMP XS              
P100:   MOV 30H,#0    
        MOV 31H,#0
        MOV 32H,#0
        MOV 33H,#0
        MOV 34H,#0
        MOV 35H,#0
JIA:    CLR TF0      
        MOV A,35H       
        CJNE A,#9,JIA1  
        MOV 35H,0        
        MOV A,34H        
        CJNE A,#5,JIA10   
        MOV 34H,#0        
P10000: JNB P1.2,P10000  
        MOV A,33H         
        CJNE A,#9,JIA100    
        MOV 33H,#0          
         MOV A,32H         
        CJNE A,#5,JIA1000    
        MOV 32H,#0          
P1000:  JNB P1.1,P1000       
        MOV A,31H             
        CJNE A,#9,JIA10000       
        MOV 31H,#0       
        MOV A,30H            
        CJNE A,#2,JIA100000     
        MOV 30H,#0            
        AJMP XS0              
JIA100000:
        INC 30H             
        AJMP XS0            
JIA10000:
        CJNE A,#3,JIAJIA      
        MOV A,30H             
        CJNE A,#02,JIAJIA        
        MOV 30H,#0            
        MOV 31H,#0
        AJMP XS0             
JIAJIA:
        INC 31H              
        AJMP XS0
JIA1000:INC 32H
        AJMP XS0
JIA100: INC 33H
        AJMP XS0       
JIA10:  INC 34H
        AJMP XS0
JIA1:   INC 35H
        AJMP XS0
        RET                 
YS1MS:  MOV R6,#9H       
YL1:    MOV R7,#19H
        DJNZ R7,$
        DJNZ R6,YL1
        RET
TAB:
DB     0C0H,0F9H,0A4H,0B0H,099H,092H,082H,0F8H,080H,090H 
DB     040H,079H,024H,030H,019H,012H,002H,078H,000H,010H     
END   此帖出自小平头技术问答