單片機60S倒計時匯編語言

ORG  0000H  
   AJMP MAIN
   ORG  000BH
   AJMP INTT0
   ORG  0030H
MAIN: MOV R7,#60
      MOV R6,#00H
   MOV DPTR,#TABLE
   MOV TMOD,#01H       
          MOV TL0,#0B0H
   MOV TH0,#3CH  ;設(shè)置定時器工作方式、初值
   SETB EA
   SETB ET0 
   SETB TR0
NEXT: MOV A,R7
      MOV B,#0AH
   DIV AB
   SETB  P1.3
   MOVC A,@A+DPTR
   MOV P0,A
   CLR   P1.4     ;開啟shi位顯示
   ACALL DELAY
   MOV A,B
   SETB  P1.4
   MOVC A,@A+DPTR
       
   MOV P0,A
   CLR   P1.3       ;開啟ge位顯示
   ACALL DELAY
   CJNE R6,#14H,NEXT
   MOV R6,#00H
   DEC R7
   CJNE  R7,#0FFH,NEXT
   SJMP MAIN
INTT0:MOV TL0,#0B0H  ;中斷服務(wù)程序
   MOV TH0,#3CH
   INC R6
   RETI
DELAY:MOV R5,#02H  ;延時子程序
 LOOP:MOV R4,#02H
   DJNZ R4,$
   DJNZ R5,LOOP
   RET
TABLE:DB 0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H,80H,90H
   END