Design a digital clock display using Common Cathode 7-segment display modules an
ID: 2990211 • Letter: D
Question
Design a digital clock display using Common Cathode 7-segment display modules and a mode switch. The clock, normally displays the time in hh-mm-ss format. It updates the time automatically using the timer interrupt of the microcontroller. On pressing the mode switch, the display changes to date in dd-mm-yy format. On pressing the button once more, the display returns to show time. use 6 seven segmant displays. The hardrware part i can take care! plz provide me with the program use external inteerupt0 , you have to send the seven segment code itself and i am not using any seven segment decoders. Use multiplexing for led displays
Explanation / Answer
ORG 0000H
LJMP MAIN
ORG 001BH ;vector address of interrupt 0
LJMP UPDATE
MAIN: MOV R1,#14 ;YEAR
MOV R6,#08 ;MONTH
MOV R7,#18 ;DAY
MOV R2,#00H ;COUNTER FOR SECONDS
MOV R3,#00 ;SECONDS
MOV R4,#29 ;MINUTES
MOV R5,#19 ;HOURS
MOV TMOD,#12H ;TIMER1 MODE 2, TIMER0 MODE 2
MOV TL1,#0C9H
MOV TH1,#7DH
MOV IE,#88H ;ENABLE GLOBAL AND TIMER1 INERRUPT
SETB TR1 ;START TIMER1
BACK:
MOV A,R5
MOV B,#10
DIV AB
MOV DPTR,#0800H ;MSB OF HOUR
MOVC A,@A+DPTR
MOV P1,#1FH
MOV P2,A
LCALL DELAY
MOV A,B
MOV DPTR,#0800H
MOVC A,@A+DPTR ;LSB OF HOUR
MOV P1,#2FH
MOV P2,A
LCALL DELAY
MOV A,R4
MOV B,#10
DIV AB
MOV DPTR,#0800H ;MSB OF MINUTES
MOVC A,@A+DPTR
MOV P1,#37H
MOV P2,A
LCALL DELAY
MOV A,B
MOV DPTR,#0800H
MOVC A,@A+DPTR
MOV P1,#3BH ;LSB OF MINUTES
MOV P2,A
LCALL DELAY
MOV A,R3
MOV B,#10
DIV AB ;MSB OF SECONDS
MOV DPTR,#0800H
MOVC A,@A+DPTR
MOV P1,#3DH
MOV P2,A
LCALL DELAY
MOV A,B
MOV DPTR,#0800H ;LSB OF SECONDS
MOVC A,@A+DPTR
MOV P1,#3EH
MOV P2,A
LCALL DELAY
JNB P3.0,STAY
SJMP BACK
STAY:JNB P3.0,STAY ;WAIT FOR KEY DE-BOUNCING, TILL KEY OPENS AFTER PRESSING
DATE: MOV A,R7
MOV B,#10
DIV AB
MOV DPTR,#0800H ;MSB OF DAY
MOVC A,@A+DPTR
MOV P1,#1FH
MOV P2,A
LCALL DELAY
MOV A,B
MOV DPTR,#0800H
MOVC A,@A+DPTR ;LSB OF DAY
MOV P1,#2FH
MOV P2,A
LCALL DELAY
MOV A,R6
MOV B,#10
DIV AB
MOV DPTR,#0800H ;MSB OF MONTH
MOVC A,@A+DPTR
MOV P1,#37H
MOV P2,A
LCALL DELAY
MOV A,B
MOV DPTR,#0800H
MOVC A,@A+DPTR
MOV P1,#3BH ;LSB OF MONTH
MOV P2,A
LCALL DELAY
MOV A,R1
MOV B,#10
DIV AB ;MSB OF YEAR
MOV DPTR,#0800H
MOVC A,@A+DPTR
MOV P1,#3DH
MOV P2,A
LCALL DELAY
MOV A,B
MOV DPTR,#0800H ;LSB OF YEAR
MOVC A,@A+DPTR
MOV P1,#3EH
MOV P2,A
LCALL DELAY
JNB P3.0,TIME ;CHECK FOr KEY PRESS
SJMP DATE
TIME: JNB P3.0,TIME ;WAIT FOR KEY DEBOUNCING
LJMP BACK
ORG 0300H
DELAY:
MOV TL0,#34H
MOV TH0,#0B4H
SETB TR0
ONESECOND_3:JNB TF0,ONESECOND_3
CLR TR0
CLR TF0
RET
ORG 0310H
UPDATE: CLR TR1
INC R2
CJNE R2,#15,NEXT
INC R3
MOV R2,#0
CJNE R3,#60,NEXT
INC R4
MOV R3,#0
CJNE R4,#60,NEXT
INC R5
MOV R4,#0
CJNE R5,#24,NEXT
MOV R5,#0
LCALL CALENDAR
NEXT: MOV TL1,#0FCH
MOV TH1,#0FH
SETB TR1
RETI
ORG 400H
CALENDAR: INC R7
CJNE R7,#32,NOUPDATE
INC R6
MOV R7,#01
CJNE R6,#13,NOUPDATE
INC R1
MOV R6,#01
CJNE R1,#100,NOUPDATE
MOV R1,#0
NOUPDATE: RET
ORG 0800H
DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FH
END
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