DS3	 DATA	 73H
DS4	 DATA	 74H
DS5	 DATA	 75H
DS6	 DATA	 76H
DS7	 DATA	 77H
DS8	 DATA	 78H
BUFF	 DATA	 7AH
SBUFF	 DATA	 7BH
MBUFF	 DATA	 7CH
PIO	 XDATA	 0a001H
PIO1	 XDATA	 0a000h

	 ORG	 0000H
	 AJMP	 START

	 ORG	 001BH          ;使用定時(shí)器1
	 AJMP	 CLOCK

	 ORG	 0030H
START:   MOV SP,#60H
	 CLR 20H
         MOV DPTR,#0a001H	;8279初始化   ;;;;;;;;;;;;;;;;;
         MOV A,#0DFH
   	MOVX @DPTR,A
LOOP10:	MOVX A,@DPTR
	JB ACC.7,LOOP10
        MOV A,#0eH   ;選擇輸入,顯示器譯碼掃描,
        MOVX @DPTR,A
	MOV A,#32h
	MOVX @DPTR,A
	 MOV	 SBUFF,#00H
	 MOV	 MBUFF,#00H
	 MOV	 A,MBUFF
	 CJNE	 A,#60H,TIME2
TIME2:	 JNC	 STOP
	 MOV	 A,SBUFF
	 CJNE	 A,#60H,TIME3
TIME3:	 JNC	 STOP
	 MOV	 BUFF,#00H
	 MOV TMOD,#10H
	 MOV TH1,#0DBH
	 MOV TL1,#0F0H
	 SETB TCON.TR1
	 SETB ET1
	 SETB EA
TIME5:
	 CJNE	 A,#20H,TIME6
	 AJMP	 STOP
TIME6:	 ACALL	 PTDEA
	 ACALL	 DSUP
	 SJMP	 TIME5
;
STOP:	 CLR	 0CAH
	 MOV	 IE,#00000000B
STOP1:	 SJMP	 STOP1
;
PTDEA:	 MOV	 R0,#DS6
	 MOV	 A,BUFF
	 ACALL	 PTDEA1
	; MOV	 DS6,#12H
        ; DEC R0
         ;MOV     DS5,#12H
	; DEC	 R0
	 MOV	 A,SBUFF
	 ACALL	 PTDEA1
PTDEA1:  MOV	 R1,A
	 ACALL	 PTDEA2
	 MOV	 A,R1
	 SWAP	 A
PTDEA2:  ANL	 A,#0FH
	 MOV	 @R0,A
	 DEC	 R0
	 RET
;
CLOCK:	 CLR	 EA              ;定時(shí)器1處理子程序
	 PUSH	 PSW
	 PUSH	 ACC
	 CLR	 0CFH
	 INC	 BUFF
	 MOV	 A,BUFF
	 CJNE	 A,#64H,CLOCK1
	 MOV	 BUFF,#00H
	 MOV	 A,SBUFF
	 INC	 A
	 DA	 A
	 MOV	 SBUFF,A
	 CJNE	 A,#60H,CLOCK1
	 MOV	 SBUFF,#00H
	 MOV	 A,MBUFF
	 INC	 A
	 DA	 A
	 MOV	 MBUFF,A
	 CJNE	 A,#60H,CLOCK1
	 MOV	 MBUFF,#00H
CLOCK1:  POP	 ACC
	 POP	 PSW
	 SETB	 EA
	 RETI
        

DSUP:   mov 30h,#81h        ;顯示子程序
	mov 31h,#DS3
	mov r7,#04h
loop3:	mov dptr,#PIO
	mov a,30h
	movx @dptr,a
	mov r0,31h
	mov a,@r0
	mov dptr,#SGTB
	movc a,@a+dptr
	mov dptr,#PIO1
	movx @dptr,a
        inc 31h
	mov a, 30h
        clr c
        rlc a
        orl a,#80h
        mov 30h,a
	djnz r7,loop3
	ret
        

SGTB:	 DB	 0C0H	   ;0   字形表
	 DB	 0F9H	   ;1
	 DB	 0A4H	   ;2
	 DB	 0B0H	   ;3
	 DB	 99H	   ;4
	 DB	 92H	   ;5
	 DB	 82H	   ;6
	 DB	 0F8H	   ;7
	 DB	 080H	   ;8
	 DB	 90H	   ;9
	 DB	 88H	   ;A
	 DB	 83H	   ;B
	 DB	 0C6H	   ;C
	 DB	 0A1H	   ;D
	 DB	 86H	   ;E
	 DB	 8EH	   ;F
	 DB	 0FFH	   ;
	 DB	 8CH	   ;P
	 DB	 0BFH	   ;-
END