shizhong.asm

控制4连LED的程序 是汇编程序用定时器中断来实现1分钟进1位

    MIAO_GE EQU 40H
	MIAO_SHI EQU 41H
	MIN_GE EQU 42H
	MIN_SHI EQU 43H

	ORG 0000H
	LJMP MAIN
	ORG 000BH
	LJMP INT_T0


MAIN:    MOV TMOD,#01H
         MOV TH0,#0B1H
	 MOV TL0,#0E0H
	 MOV R0,#50
	 SETB EA
	 SETB ET0
	 SETB TR0
	 MOV MIAO_GE,#0
	 MOV MIAO_SHI,#0
	 MOV MIN_GE,#0
	 MOV MIN_SHI,#0

LOOP:
	LCALL DEALDATA

	LCALL DISPLAY

        LJMP LOOP

DISPLAY:	     ;显示
        MOV DPTR,#TAB
        MOV A,MIAO_GE
	 MOVC A,@A+DPTR
	 MOV P0,A
         CLR P2.7
         LCALL DELAY
         SETB P2.7

	 MOV A,MIAO_SHI
	 MOVC A,@A+DPTR
	 MOV P0,A
         CLR P2.6
         LCALL DELAY
         SETB P2.6

	 MOV A,MIN_GE
	 MOVC A,@A+DPTR
	 MOV P0,A
         CLR P2.5
         LCALL DELAY
         SETB P2.5

	 MOV A,MIN_SHI
	 MOVC A,@A+DPTR
	 MOV P0,A
         CLR P2.4
         LCALL DELAY
         SETB P2.4
RET

DEALDATA:			  ; 数据处理
        MOV A,#10
	CJNE A,MIAO_GE,RETURN
	INC MIAO_SHI
	MOV MIAO_GE,#0

	MOV A,#6
	CJNE A,MIAO_SHI,RETURN
	INC MIN_GE
	MOV MIAO_SHI,#0

	MOV A,#10
	CJNE A,MIN_GE,RETURN
	INC MIN_SHI
        MOV MIN_GE,#0

	MOV A,#6
	CJNE A,MIN_SHI,RETURN
        MOV MIN_SHI,#0
	MOV MIN_GE ,#0
RETURN:
    RET

	      					;延时
DELAY:
    MOV R1,#20
DELAY1:
    MOV R2,#20
	DJNZ R2,$
	DJNZ R1,DELAY1
	RET



INT_T0:							 ; 中断
    CLR TR0
	MOV TH0,#0B1H
	MOV TL0,#0E0H
	DJNZ R0,EXIT
	MOV R0,#50
	INC MIAO_GE
	
EXIT:
    SETB TR0
    RETI
							;段码表
TAB:
    DB	00101000B	;0
	DB	11101011B	;1
	DB	00110010B	;2
	DB	10100010B	;3
	DB	11100001B	;4
	DB	10100100B	;5
	DB	00100100B	;6
	DB	11101010B	;7
	DB	00100000B	;8
	DB	10100000B	;9
	DB	01100000B	;A

	END