dian.asm

此代码是单片机电子时钟程序,属于精简的那种,提供给用来应付作业设计者~!

	ORG	0000H
	AJMP	MAIN
	ORG	000BH
	AJMP	TIME
MAIN:	MOV	SP,#5FH
	MOV	TMOD,#1
	MOV	TH0,#0B1H
	MOV	TL0,#0E0H
	MOV	IE,#10000010B
	SETB	TR0
	MOV	R3,#0
	MOV	R4,#0
	MOV	79H,#0
	MOV	7AH,#0
DISP:	MOV	A,#03H
	MOV	DPTR,#0FF20H
	MOVX	@DPTR,A
LOOP:	MOV	R5,#1
	MOV	R0,#30H
	MOV	A,R5
LOOP1:	MOV	DPTR,#0FF21H
	MOVX	@DPTR,A
	MOV	DPTR,#0FF22H
	MOV	A,@R0
	ADD	A,#0EH
	MOVC	A,@A+PC
	MOVX	@DPTR,A
	ACALL	DLAY
	INC	R0
	MOV	A,R5
	JB	ACC.5,LD
	RL	A
	MOV	R5,A
	AJMP	LOOP1
LD:	SJMP	LOOP
TABLE:	DB	0C0H,0F9H,0A4H,0B0H
	DB	99H,92H,82H,0F8H
	DB	80H,90H,88H
DLAY:	MOV	R7,#02H
DL1:	MOV	R6,#0FFH
DL2:	DJNZ	R6,DL2
	DJNZ	R7,DL1
	RET
TIME:	MOV	TH0,#0B1H
	MOV	TL0,#0E0H
	INC	R3
	CJNE	R3,#25,BACK
	MOV	R3,#0
	INC	R4
	MOV	A,R4
	MOV	B,#10
	DIV	AB
	MOV	31H,A
	MOV	30H,B
	CJNE	R4,#60,BACK
	MOV	30H,#0
	MOV	31H,#0
	MOV	R4,#0
	INC	79H
	MOV	A,79H
	MOV	B,#10
	DIV	AB
	MOV	33H,A
	MOV	32H,B
	MOV	A,79H
	CJNE	A,#60,BACK
	MOV	79H,#0
	MOV	33H,#0
	MOV	32H,#0
	INC	7AH
	MOV	A,7AH
	MOV	B,#10
	DIV	AB
	MOV	35H,A
	MOV	34H,B
	MOV	A,7AH
	CJNE	A,#24,BACK
	MOV	35H,#0
	MOV	34H,#0
	MOV	7AH,#0
BACK:	RETI
	END