shuzizhong.txt

一个基于单片机的电子时钟

ORG 0000H
LJMP MAIN
ORG 000BH
LJMP DD
ORG 0060H
MAIN: MOV SP,#60H
      MOV R0,#00H
      MOV R1,#00H
      MOV R2,#00H
      MOV R3,#00H
      MOV R4,#00H
      MOV R7,#00H
      SETB P3.7
      CLR P3.6
      SETB P3.5
      MOV TMOD,#01H
      MOV TL0,#0B0H
      MOV TH0,#3CH
      MOV IE,#82H
      SETB TR0
      MOV 32H,#0BFH
      MOV 31H,#0BFH
      MOV 30H,#0BFH
XM:   MOV P0,30H
      LCALL TIME
      MOV P0,A
      MOV P1,31H
      LCALL TIME
      MOV P1,A
      MOV P2,32H
      LCALL TIME
      MOV P2,A
      MOV P3.6,20H.0
      LCALL TIME
      CLR P3.6
      LJMP XM
ORG 1000H
DD:INC R0
   CJNE R0,#10,RETURN
   CPL P3.5
   MOV R0,#00H
   INC R7
   CJNE R7,#2,FM
   MOV R7,#00H
   SETB P3.7
FM:INC R1
   CJNE R1,#120,RETURN
   MOV R1,#00H
   INC R2
   MOV A,R2
   MOV DPTR,#TAB
   MOVC A,@A+DPTR
   MOV P0,A
   MOV 30H,A
   CJNE R2,#10,RETURN
   MOV R2,#00H
   INC R3
   MOV A,R3
   MOV DPTR,#TAB
   MOVC A,@A+DPTR
   MOV P2,A
   MOV 32H,A
   CJNE R3,#6,RETURN
   MOV R3,#00H
   MOV P2,#0BFH
   MOV 32H,#0BFH
   INC R4
   MOV A,R4
   MOV DPTR,#TAB
   MOVC A,@A+DPTR
   MOV P1,A
   MOV 31H,A
   MOV A,R4
   SUBB A,#10
   JC RETURN 
   CJNE R4,#12,kk 
   CLR P3.6
   CLR 20H.0
   MOV R4,#00H
   SJMP RETURN
KK:SETB P3.6
   SETB 20H.0
   SJMP RETURN
RETURN:MOV TL0,#0B0H
       MOV TH0,#3CH
       RETI
ORG 3000H
TAB:DB 0BFH,86H,0DBH,0CFH,0E6H,0EDH,0FDH,87H,0FFH,0EFH,0BFH,86H,0BFH
TIME:MOV R6,#5
DEL: MOV R5,#200
DEL1:DJNZ R5,DEL1
     DJNZ R6,DEL
     MOV A,#00H
     RET