電子鐘設計
1、 電路圖：
2功能實現：
（1． 把“單片機系統”區域中的P1.0－P1.7端口用8芯排線連接到“動態數碼顯示”區域中的A－H端口上；
（2． 把“單片機系統：區域中的P3.0－P3.7端口用8芯排線連接到“動態數碼顯示”區域中的S1－S8端口上；
（3． 把“單片機系統”區域中的P0.0/AD0、P0.1/AD1、P0.2/AD2端口分別用導線連接到“獨立式鍵盤”區域中的SP3、SP2、SP1端口上；
3、程序框圖：
6． 匯編源程序
HOURK BIT P1.2
MINITEK BIT P1.1
SECONDK BIT P1.0
SECOND EQU 30H
MINITE EQU 31H
HOUR EQU 32H
ORG 00H
LJMP START
ORG 0BH
LJMP INT_T0
ORG 0030H
START:
MOV SECOND,#00H
MOV MINITE,#00H
MOV HOUR,#12
MOV R0,#00H
MOV TMOD,#01H
MOV TH0,#3CH
MOV TL0,#0B0H
SETB EA
SETB ET0
SETB TR0
NEXT: MOV A,#7FH
MOV P3,A
MOV A,HOUR
MOV B,#10
DIV AB
MOV DPTR,#TABLE
MOVC A,@A+DPTR
MOV P2,A
CALL DELAY
MOV A,#0BFH
MOV P3,A
MOV A,B
MOV DPTR,#TABLE
MOVC A,@A+DPTR
MOV P2,A
CALL DELAY
MOV A,#0DFH
MOV P3,A
mov p2,#40h
call delay
mov a,#0efh
mov p3,a
MOV A,MINITE
MOV B,#10
DIV AB
MOV DPTR,#TABLE
MOVC A,@A+DPTR
MOV P2,A
CALL DELAY
MOV A,#0F7H
MOV P3,A
MOV A,B
MOV DPTR,#TABLE
MOVC A,@A+DPTR
MOV P2,A
CALL DELAY
MOV A,#0FBH
MOV P3,A
mov p2,#40h
call delay
MOV A,#0FDH
MOV P3,A
MOV A,SECOND
MOV B,#10
DIV AB
MOV DPTR,#TABLE
MOVC A,@A+DPTR
MOV P2,A
CALL DELAY
MOV A,#0FEH
MOV P3,A
MOV A,B
MOV DPTR,#TABLE
MOVC A,@A+DPTR
MOV P2,A
CALL DELAY
WT: JB SECONDK,NK1
LCALL DELY10MS
JB SECONDK,NK1
JNB SECONDK,$
INC SECOND
MOV A,SECOND
CJNE A,#60,NK1
MOV SECOND,#00H
NK1: JB MINITEK,NK2
LCALL DELY10MS
JB MINITEK,NK2
JNB MINITEK,$
INC MINITE
MOV A,MINITE
CJNE A,#60,NK2
MOV MINITE,#00H
NK2: JB HOURK,NK3
LCALL DELY10MS
JB HOURK,NK3
JNB HOURK,$
INC HOUR
MOV A,HOUR
CJNE A,#24,NK3
MOV HOUR,#00
NK3:
MOV A,R0
CJNE A,#20,NEXT1
MOV R0,#0
INC SECOND
MOV A,SECOND
CJNE A,#60,NEXT1
MOV SECOND,#0
INC MINITE
MOV A,MINITE
CJNE A,#60,NEXT1
MOV MINITE,#0
INC HOUR
MOV A,HOUR
CJNE A,#24,NEXT1
MOV HOUR,#0
next1:JMP NEXT
TABLE:DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FH,40H
INT_T0: CLR TR0
INC R0
MOV TH0,#3CH
MOV TL0,#0B0H
SETB TR0
RETI
DELAY:
MOV R6,#2
D1: MOV R7,#248
DJNZ R7,$
DJNZ R6,D1
RET
DELY10MS:
MOV R6,#10
DD1: MOV R7,#248
DJNZ R7,$
DJNZ R6,DD1
RET
END