time.asm

at89c51单片机的串口通迅代码

        minH data 20h
        minL data 21h
        secH data 22h
        secL data 23h
        min  data 24h
        sec  data 25h

        org 0000h
        ljmp main
        org 0023h
        ljmp re
        org 0100h
main:   mov min,#12
        mov sec,#30
        mov tmod,#00100000B
        anl pcon,#011111111B
        mov th1,#0f3h
        mov tl1,#0f3h
        setb tr1
        mov scon,#01010000B
        mov ie,#10010000B
start:  MOV A,min
        MOV B,#100
        DIV AB
        MOV R3,A
        MOV A,#10
        XCH A,B
        DIV AB
        MOV minH,A
        MOV minL,B

        MOV A,sec
        MOV B,#100
        DIV AB
        MOV R3,A
        MOV A,#10
        XCH A,B
        DIV AB
        MOV secH,A
        MOV secL,B


        mov dptr,#tab
        clr a

        mov a,minH
        movc a,@a+dptr
        mov p0,a
        clr p2.7
        acall del
        setb p2.7

        mov a,minL
        movc a,@a+dptr
        mov p0,a
        clr p0.0
        clr p2.6
        acall del
        setb p2.6

        mov a,secH
        movc a,@a+dptr
        mov p0,a
        clr p2.5
        acall del
        setb p2.5

        mov a,secL
        movc a,@a+dptr
        mov p0,a
        clr p2.4
        acall del
        setb p2.4

        ajmp start

tab: db 03h,9fh,25h,0dh,99h,49h,41h,1fh,01h,09h
;-------------------------------------------------------------

re:     push a
        push psw
        jnb ri,$
        clr ri
        mov a,sbuf
        mov min,a
        jnb ri,$
        clr ri
        mov a,sbuf
        mov sec,a
        pop psw
        pop a
        reti

DEL:
         MOV  R6,#25
 DL2:    MOV  R7,#50
         DJNZ  R7,$
         DJNZ  R6,DL2
         RET