Jam Digital AT89C51

Compile source code dibawah ini dengan Mide 51

S_SET  BIT P1.0      
M_SET  BIT P1.1      
H_SET  BIT P1.2      
SECOND  EQU 30H
MINUTE  EQU 31H
HOUR  EQU 32H
TCNT  EQU 34H
  ORG 00H
  SJMP START
  ORG 0BH
  LJMP INT_T0
START:  MOV DPTR,#TABLE
  MOV HOUR,#0      
  MOV MINUTE,#0
  MOV SECOND,#0
  MOV TCNT,#0
  MOV TMOD,#01H
  MOV TH0,-50000/256  
  MOV TL0,-50000 MOD 256
  MOV IE,#82H
  SETB TR0
;****************************************************

A1:  LCALL DISPLAY  
  JNB S_SET,S1
  JNB M_SET,S2
  JNB H_SET,S3    
  LJMP A1
S1:  LCALL DELAY  
  JB S_SET,A1

  INC SECOND  
  MOV A,SECOND
  CJNE A,#60,J0 
  MOV SECOND,#0
  LJMP K1
S2:  LCALL DELAY
  JB M_SET,A1

K1:  INC MINUTE  
  MOV A,MINUTE
  CJNE A,#60,J1 
  MOV MINUTE,#0
  LJMP K2
S3:  LCALL DELAY
  JB H_SET,A1

K2:  INC HOUR  
  MOV A,HOUR
  CJNE A,#24,J2 
  MOV HOUR,#0
  MOV MINUTE,#0
  MOV SECOND,#0
  LJMP A1
;****************************************************

J0:  JB S_SET,A1
  LCALL DISPLAY
  SJMP J0
J1:  JB M_SET,A1
  LCALL DISPLAY
  SJMP J1
J2:  JB H_SET,A1
  LCALL DISPLAY
  SJMP J2
;***********************************************

INT_T0:  MOV TH0,-50000/256
  MOV TL0,-50000 MOD 256  
  INC TCNT
  MOV A,TCNT
  CJNE A,#20,RETUNE 
  INC SECOND
  MOV TCNT,#0
  MOV A,SECOND
  CJNE A,#60,RETUNE
  INC MINUTE
  MOV SECOND,#0
  MOV A,MINUTE
  CJNE A,#60,RETUNE
  INC HOUR
  MOV MINUTE,#0
  MOV A,HOUR
  CJNE A,#24,RETUNE
  MOV HOUR,#0
  MOV MINUTE,#0
  MOV SECOND,#0
  MOV TCNT,#0
RETUNE:  RETI
;******************************************
DISPLAY: MOV A,SECOND 
  MOV B,#10
  DIV AB
  CLR P3.6
  MOVC A,@A+DPTR
  MOV P0,A
  LCALL DELAY
  SETB P3.6
  MOV A,B
  CLR P3.7
  MOVC A,@A+DPTR
  MOV P0,A
  LCALL DELAY
  SETB P3.7

  CLR P3.5
  MOV P0,#40H  
  LCALL DELAY
  SETB P3.5

  MOV A,MINUTE 
  MOV B,#10
  DIV AB
  CLR P3.3
  MOVC A,@A+DPTR
  MOV P0,A
  LCALL DELAY
  SETB P3.3
  MOV A,B
  CLR P3.4
  MOVC A,@A+DPTR
  MOV P0,A
  LCALL DELAY
  SETB P3.4

  CLR P3.2
  MOV P0,#40H  
  LCALL DELAY
  SETB P3.2

     MOV A,HOUR  
  MOV B,#10
  DIV AB
  CLR P3.0
  MOVC A,@A+DPTR
  MOV P0,A
  LCALL DELAY
  SETB P3.0
  MOV A,B
  CLR P3.1
  MOVC A,@A+DPTR
  MOV P0,A
  LCALL DELAY
  SETB P3.1
  RET

TABLE:   DB  3FH,06H,5BH,4FH,66H
  DB 6DH,7DH,07H,7FH,6FH
DELAY:  MOV R6,#10
D1:  MOV R7,#250
  DJNZ R7,$
  DJNZ R6,D1
  RET

  END

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