org     0000h          ;200MS方波,蜂鳴器鳴響5次,每隔1S顯示1--30
        ajmp    main
        org     001bh
        ajmp    int_1
main:   mov     a,   #0bbh
        mov     r5,  #04h
        acall   led
        clr     p1.0
start:  mov     sp,  #60h
        mov     tmod,#10h
        mov     tl1, #0b0h     ;晶振為12M,每50MS溢出中斷一次
        mov     th1, #3ch      ;若晶振為11.0592M時,時間常數為4C00H,若晶振為6M時,時間常數為9E58H
        mov     r0,  #2h
        mov     r1,  #00h
        mov     r2,  #00h
        mov     r3,  #00h
        mov     r4,  #00h
        mov     40h, #09h
        setb    tr1
        setb    et1
        setb    ea
here1:  cjne    r3,#01h,here
        mov     r3,#00h
        mov     41h,   r2
        acall   led1
        acall   led2
        cjne    r4,#01h,here
        mov     r4,#00h
        clr     p1.1
feng1:  acall   delay
        cpl     p1.1
        djnz    40h,feng1
        mov     40h,#09h
here:   sjmp    here1
int_1:  push    acc
        push    psw
        clr     tr1
        mov     tl1,  #0b0h
        mov     th1,  #3ch
        setb    tr1
        djnz    r0,    e_end
        mov     r0,    #02h
        cpl     p1.0
        inc     r1
        cjne    r1,#0ah,e_end
        mov     r1,#00h
        mov     r3,#01h
        inc     r2
        cjne    r2,#1eh,e_end
        mov     r2,#00h
        mov     r4,#01h
 e_end:  pop     psw
        pop     acc
        reti

led1:   mov b,  #0ah
        mov a,  41h
        div ab
        mov r6,a
        mov r7,b
        mov  dptr,#table
        mov a,r7
        movc a,@a+dptr
        mov r5,#01h
        acall led
        mov dptr,#table
        mov a,r6
        movc a,@a+dptr
        mov r5,#01h
        acall led
        ret

 led:   mov     scon,  #00h
        mov     sbuf,  a
        jnb     ti,   $
        clr     ti
        djnz    r5, led
        ret
led2:   mov     r5, #02h
        mov     a,  #00h
        acall   led
        ret
delay:  mov     r6, #0ffh
a3:     nop
        djnz    r6, a3
        djnz    r7, delay
        ret
table:  db 0bbh,09h,0eah,6bh,59h,73h,0f3h,0bh
        db 0fbh,7bh,0dbh,0f1h,0b2h,0e9h,0f2h,0d2h