display.asm

自制单片机实验板.rar

;*****************************************************
;
;     This programme is for study Ver1.0.0 beta
;This programme must be run in 12MHz standard settings
;              Display  programmer
;               Designer: Mr.Koii
;         Copyright 2002-2003 koiistudio
;     2002.12.25 at Changsha. H.N. P.R.China.
;
;*****************************************************

digital_byte            equ     09h                     ;显存首址，连续4字节为显存

;*****************************************************
;数码管显示
;*****************************************************

digital:	       mov     a,digital_bit
                       jb      acc.0,digital_check0
                       jb      acc.1,digital_check1
                       jb      acc.2,digital_check2
                       jb      acc.3,digital_check3
                       jb      acc.4,digital_check4
                       jb      acc.5,digital_check5
                       jb      acc.6,digital_check6
                       jb      acc.7,digital_check7
                       call    beep2
                       ret
digital_check0:        mov     r0,#digital_byte
                       mov     a,@r0
                       swap    a
                       anl     a,#0fh
                       jmp     digital_display
                       ret
digital_check1:        mov     r0,#digital_byte
                       mov     a,@r0
                       anl     a,#0fh
                       jmp     digital_display
                       ret
digital_check2:        mov     r0,#digital_byte
                       inc     r0
                       mov     a,@r0
                       swap    a
                       anl     a,#0fh
                       jmp     digital_display
                       ret
digital_check3:        mov     r0,#digital_byte
                       inc     r0
                       mov     a,@r0
                       anl     a,#0fh
                       jmp     digital_display
                       ret
digital_check4:        mov     r0,#digital_byte
                       inc     r0
                       inc     r0
                       mov     a,@r0
                       swap    a
                       anl     a,#0fh
                       jmp     digital_display
                       ret
digital_check5:        mov     r0,#digital_byte
                       inc     r0
                       inc     r0
                       mov     a,@r0
                       anl     a,#0fh
                       jmp     digital_display
                       ret   
digital_check6:        mov     r0,#digital_byte
                       inc     r0
                       inc     r0
                       inc     r0
                       mov     a,@r0
                       swap    a
                       anl     a,#0fh
                       jmp     digital_display
                       ret
digital_check7:        mov     r0,#digital_byte
                       inc     r0
                       inc     r0
                       inc     r0
                       mov     a,@r0
                       anl     a,#0fh
                       jmp     digital_display
                       ret
digital_display:       mov     dptr,#data_tab_digital
                       movc    a,@a+dptr
                       cpl     a
                       mov     p2,#0
                       mov     p0,a
                       mov     a,digital_bit
                       mov     p2,a
                       rl      a
                       mov     digital_bit,a
                       call    time2_5ms
                       ret

;*****************************************************
;共阴数码管显示数据
;排列为：0-F, 0.-F.
;端口排列：p07   p06  p05  p04  p03  p02  p01  p00
;段排列为： d    dp    e    c    g    b    f    a
;*****************************************************

data_tab_digital:      db     0b7h,014h,0adh,09dh,01eh,09bh,0bbh,015h
                       db     0bfh,09fh,03fh,0bah,0a8h,0bch,0abh,02bh
                       db     0f7h,054h,0edh,0ddh,05eh,0dbh,0fbh,055h
                       db     0ffh,0dfh,07fh,0fah,0e8h,0fch,0ebh,06bh