time.asm

一个电子时钟

	ORG	0000H
	JMP	MAIN
	ORG	000BH	
	LJMP	LOOP1
	ORG	001BH
	LJMP	LOOP2
;========================================
	HOUR	DATA	30H
	MIN	DATA	31H
	SEC	DATA	32H
	COUNT1	DATA	33H
	COUNT	EQU	34H		;秒计数
	COUNTM	DATA	35H		;分个位计数
	COUNTM1	DATA	36H		;分十位计数
	COUNTH	DATA	37H		;时个位计数
	COUNTH1	DATA	38H		;时十位计数
	COUNTER	DATA	39H
;========================================	
	ORG	0030H
MAIN:
	MOV	P0,#0FFH
	MOV	P2,#0FFH
	MOV	COUNTER,#00H
	MOV	COUNT1,#01H
	MOV	COUNTM1,#00H
	MOV	COUNTH1,#00H
	MOV	COUNTH,#00H
	MOV	COUNTM,#00H
	MOV	HOUR,#00H
	MOV	MIN,#00H
	MOV	SEC,#01H
	SETB	COUNT	
	MOV	TMOD,#01H
	MOV	TH0,#3CH
	MOV	TL0,#0B0H
	MOV	TH1,#8AH
	MOV	TL1,#0D0H
	SETB	PT0
	SETB	EA
	SETB	ET0
	SETB	ET1
START:
	SETB	TR0
	SETB	TR1
	JNB	COUNT,SEC1
LJMP	START

LOOP1:
	MOV	TH0,#3CH
	MOV	TL0,#0B0H
	MOV	A,COUNT1
	CJNE	A,#28H,A0
	JMP	SEC01
A0:	INC	COUNT1
	RETI
SEC01:
	MOV	COUNT1,#01H
	CLR	COUNT
	RETI
SEC1:	
	SETB	COUNT
	INC	SEC
	MOV	A,SEC
	
	CJNE	A,#60,B0
	JMP	MIN1
B0:	JMP	START
MIN1:
	MOV	SEC,#00H
	INC	MIN
	INC	COUNTM
	MOV	A,MIN
	CJNE	A,#60,A1
	JMP	HOUR1
A1:	JMP	START
HOUR1:
	MOV	MIN,#00H
	INC	HOUR
	INC	COUNTH
	MOV	A,HOUR
	CJNE	A,#24,A2
	JMP	ZERO1
A2:	JMP	START
ZERO1:
	MOV	HOUR,#00H
	MOV	COUNTH,#00H
	MOV	COUNTH1,#00H
	JMP	START
;=============================================
;读显示 
LOOP2:
	MOV	TH1,#8AH
	MOV	TL1,#0D0H
	MOV	A,COUNTER
	CJNE	A,#0,C1
	JMP	MIN10
C1:	CJNE	A,#1,C2
	JMP	MIN11	
C2:	CJNE	A,#2,C3
	JMP	HOUR10
C3:	CJNE	A,#3,C4
	JMP	HOUR11
C4:	MOV	COUNTER,#00H
	RETI
;---------------------------------
;分钟个位显示
;---------------------------------
MIN10:
	INC	COUNTER
	MOV	A,COUNTM
	CJNE	A,#10,A3
	JMP	MINZERO	
A3:
	MOV 	DPTR,#TABLE
     	MOVC 	A,@A+DPTR
     	MOV 	P0,A
	MOV	P2,#7FH
       	RETI
MINZERO:
	MOV	COUNTM,#00H
	INC	COUNTM1
	MOV	A,COUNTM1
	CJNE	A,#6,MIN11
	JMP	MINZREO1
;---------------------------------
;分钟十位显示
;---------------------------------
MIN11:
	INC	COUNTER
	MOV	A,COUNTM1
	MOV 	DPTR,#TABLE
     	MOVC 	A,@A+DPTR
     	MOV 	P0,A
	MOV	P2,#0BFH
	RETI
MINZREO1:
	MOV 	COUNTM1,#00H
	JMP	A3
;---------------------------------
;小时个位显示
;---------------------------------
HOUR10:
	INC	COUNTER
	MOV	A,COUNTH
	CJNE	A,#10,A4
	JMP	HOURZERO	
A4:
	MOV	A,COUNTH
	MOV 	DPTR,#TABLE1
     	MOVC 	A,@A+DPTR
     	MOV 	P0,A
	MOV	P2,#0DFH
       	RETI
HOURZERO:
	MOV	COUNTH,#00H
	INC	COUNTH1
	MOV	A,COUNTH1
	CJNE	A,#3,HOUR11
	JMP	HOURZREO1
;---------------------------------
;小时十位显示
;---------------------------------
HOUR11:
	MOV	COUNTER,#00H
	MOV	A,COUNTH1
	MOV 	DPTR,#TABLE
     	MOVC 	A,@A+DPTR
     	MOV 	P0,A
	MOV	P2,#0EFH
	RETI
HOURZREO1:
	MOV 	COUNTH1,#00H
	JMP	A4

TABLE:	DB 0A0H,0BBH,62H,2AH,39H,2CH,24H,0BAH,20H,28H;数字0~9
TABLE1:	DB 80H,9BH,42H,0AH,19H,0CH,04H,9AH,00H,08H;小时个位0~9
END