电子钟汇编

CONTROL equ 0c003h   ;
COUNT0  equ 0c000h    ;
COUNT1  equ 0c001h     ;
COUNT2  equ 0c002h  ;
OUTBIT   equ 08002h  ;
OUTSEG   equ 08004h  ;
mode  equ 82h           ;
CTL8255 equ 8003h         ;
ICW1    equ 00010011b     ;
ICW2    equ 00100000b     ; 中断号为20H(低三位000)
ICW4    equ 00000001b     ; 工作在8086/88 方式（a0=1,若a0=0工作在8085）
OCW1    equ 11111110b     ; 只响应INT0 中断(a0=0,其他为1可屏蔽)
CS8259A  equ 0d000h        ;
CS8259B  equ 0d001h         ;
data   segment       ;
CNT    db  0
LEDBuf db  6 dup(?)  ;
Num    db  1 dup(?)  ;
DelayT db  1 dup(?)   ;
H   db  0         ;时间2位
M  db  0           ;分钟2位
S  db  0           ;秒钟2位

LEDMAP:              ; 八段管显示码
       db    3fh, 06h, 5bh, 4fh, 66h, 6dh, 7dh, 07h
       db    7fh, 6fh, 77h, 7ch, 39h, 5eh, 79h, 71h
data   ends  ;八段数码管数据位结束


code   segment              ;代码段

       assume cs:code, ds: data
Delay  proc  near  ;
 push  ax      ;
       push  cx
 mov   al, 0
       mov   cx,ax
       loop  $        ;
       pop   cx   ;
       pop   ax
       ret
Delay  endp    ;
DisplayLED proc near    ;
       mov   bx, offset LEDBuf  ;
       mov   cl, 6         ; 共6个八段管
       mov   ah, 00100000b ; 从左边开始显示
DLoop:                     ;循环子程序
       mov   dx, OUTBIT    ;位控制口08002h进DX
       mov   al, 0
       out   dx,al         ; 关所有八段管(1次)
       mov   al, [bx]       ;送bx（八段数码管）地址
       mov   dx, OUTSEG    ;
       out   dx,al          ;
       mov   dx, OUTBIT    ;位控制口08004h进DX
       mov   al, ah        ;ah:00100000b送al
       out   dx, al       ; 显示一位八段管
push  ax             ;
       mov   ah, 1          ;
       call  Delay         ;
       pop   ax          ;
 shr   ah, 1       ;