請(qǐng)問(wèn)，這個(gè)程序要循環(huán)顯示要怎么實(shí)現(xiàn)？

ORG 0000H
START:MOV DPTR,#TAB
MOV SCON,#00H;串口方式0工作
MOV P0,#6CH;點(diǎn)亮紅，綠燈
MOV R0,#0 ;R0清零
LEFT:INC R0
CJNE R0 ,#55,LP0;R0<55,轉(zhuǎn)LP0
MOV P0,#6AH;R0=55,點(diǎn)亮紅，黃燈
LJMP LP1
LP0:CJNE R0,#60,LP1;R0<60，轉(zhuǎn)LP1
MOV P0,#0C6H ;R0=60,點(diǎn)亮綠、紅燈
LJMP RIGHT
LP1:LCALL DBDB
LCALL DISP
LJMP LEFT;20H為1,轉(zhuǎn)LEFT
RIGHT :DEC R0
CJNE R0,#5,LP2;R0>0,轉(zhuǎn)LP2
MOV P0,#0A6H;R0=5,點(diǎn)亮黃、紅燈
LJMP LP3
LP2:CJNE R0,#0,LP3
MOV P0,#6CH;R0=0,點(diǎn)亮紅、綠燈
LJMP LEFT
LP3:LCALL DBDB
LCALL DISP
LCALL RIGHT
DBDB:MOV A,R0
MOV B,#10
DIV AB
MOV R1,A
MOV R2,B
RET
DISP:
MOV A,R2
MOVC A,@A+DPTR
MOV SBUF,A
JNB TI,$;查T(mén)I位
CLR TI
MOV A,R1
MOVC A,@A+DPTR
MOV SBUF,A
JNB TI,$
CLR TI
LCALL DELAY
RET
DELAY:
MOV R3,#09H
K1:MOV R4,#100
K2:MOV R5,#250
K3:DJNZ R5,K3
   DJNZ R4,K2
   DJNZ R3,K1
   RET
TAB:  DB  3FH,06H,5BH
      DB  4FH,66H
      DB  6DH,7DH,07H
      DB  7FH,6FH