定时器.asm

WAVE6000编写的常用的程序 包括键盘 通信 数据转换

        org     0000h
        ajmp    main
        org     001bh
        ajmp    int_1
main:   mov     a,   #0bbh
        mov     r4,  #04h
        acall   led
        mov     a,   #00h
        mov     p1,  a
start:  mov     sp,  #60h
        mov     p1,  #0ffh
        mov     tmod,#10h
        mov     tl1, #0b0h     ;晶振为12M,每50MS定时器溢出中断一次
        mov     th1, #3ch      ;若晶振为11.0592M时,时间常数为4C00H,若晶振为6M时,时间常数为9E58H
        mov     r0,  #00h
        mov     r1,  #14h
        mov     40h, #00h
        setb    tr1
        setb    et1
        setb    ea
here:   sjmp    here
int_1:  push    acc
        push    psw
        push    dpl
        push    dph
        clr     tr1
        mov     tl1,  #0b0h
        mov     th1,  #3ch
        setb    tr1
        djnz    r1,    e_end
        mov     r1,    #014h
        mov     dptr,  #tab
        mov     a,     r0
        movc    a,     @a+dptr
        mov     p1,    a
        inc     r0
        cjne    r0,#0ah,l1
        mov     r0,#00h
  l1:   mov     r2,    40h
        inc     r2
        mov     40h,   r2
        acall   led1
        acall   led2
e_end:  pop     dph
        pop     dpl
        pop     psw
        pop     acc
        reti
led1:   mov b,  #0fh
        mov a,  40h
        div ab
        mov r2,a
        mov r3,b
        mov  dptr,#table
        mov a,r3
        movc a,@a+dptr
        mov r4,#01h
        acall led
        mov dptr,#table
        mov a,r2
        movc a,@a+dptr
        mov r4,#01h
        acall led
        ret

led:     mov     scon,  #00h
         mov     sbuf,  a
         jnb     ti,   $
         clr     ti
         djnz r4,led
        ret
led2:   mov  r4, #02h
        mov  a,  #00h
        acall    led
        ret
delay:  mov     r6,     #0ffh
a3:     nop
        djnz    r6,     a3
        djnz    r7,     delay
        ret
tab:   db 05h,0ah,14h,28h,50h,0a0h,55h,0aah,0ffh,00h
table:  db 0bbh,09h,0eah,6bh,59h,73h,0f3h,0bh
        db 0fbh,7bh,0dbh,0f1h,0b2h,0e9h,0f2h,0d2h