sss4.asm

proteus模拟计数试验

       AJMP MAIN
     	 
       ORG 03H                      
	 MOV P3,#0FFH
       MOV R6,#6
       MOV R0,#35H                       
AJ:    INC @R0
       CJNE @R0,#10,$+3
       JC BACK
       MOV @R0,#0
	 DEC R0
	 DJNZ R6,AJ
       RETI
BACK:  RETI

MAIN:  MOV R1,#30H
       MOV @R1,#0
	 INC R1
       CJNE R1,#36H,MAIN+2  
       MOV P3,#0FFH   
       MOV DPTR,#SEGPT
       SETB IT0
       MOV IE,#9FH
    
LOOPO: MOV R1,#30H
       MOV R7,#20H
LOOPI: MOV P2,#0
       MOV A,@R1
       MOVC A,@A+DPTR
       
       MOV P1,A
       CJNE R7,#2,AAA
       CLR P1.7
AAA:   MOV P2,R7
       INC R1
       MOV A,R7
       RR A
       MOV R7,A
       CJNE R7,#80H,LOOPI
       SJMP LOOPO
SEGPT: DB 0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H,80H,98H
       END