8086+8253A可調時鐘Proteus仿真程序

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ID:737982 發表于 2020-4-26 12:54 | 只看該作者 |只看大圖回帖獎勵

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8086可調時鐘仿真原理圖如下（proteus仿真工程文件可到本帖附件中下載）

單片機源程序如下:

.MODEL SMALL
.8086
.stack
.code
.startup
NMI_init: push es ;NMI不可屏蔽中斷向量表初始化
xor ax, ax
mov es, ax
mov al, 02h
xor ah, ah
shl ax, 1
shl ax, 1
mov si, ax
mov ax, offset NMI_service
mov es:[si], ax
inc si
inc si
mov bx, cs
mov es:[si], bx
pop es
;定時/計數器初始化
mov al,00110111b ;T0 16位 mode3 bcd
mov dx,0406h ;控制口地址
out dx,al
mov dx,0400h ;T0地址
mov ax,0100h ;100KHz 100分頻 1KHz
out dx,al
mov al,ah ;高字節
out dx,al
mov al,10110101b ;T2 16位 mode2 bcd
mov dx,0406h
out dx,al
mov dx,0404h
mov ax,1000h ;1KHz 1000分頻 1Hz
out dx,al
mov al,ah ;高字節
out dx,al
loop0: ;主任務
call key
call disp
jmp loop0
NMI_service: ;中斷服務程序
push ax
mov al,sec
add al,1
daa
mov sec,al
cmp sec,60h
jb exit
mov sec,0
mov al,min
add al,1
daa
mov min,al
cmp min,60h
jb exit
mov min,0
mov al,hou
add al,1
daa
mov hou,al
cmp hou,12h
jb exit
mov hou,0
exit: pop ax
iret
disp proc near
mov al,0ffh ;不顯示
mov dx,0201h
out dx,al
mov bl,sec
and bx,000fh
mov si,bx
mov al,situation[si] ;段碼
mov dx,0200h
out dx,al
mov al,0feh ;秒個位
mov dx,0201h
out dx,al
call delay
mov al,0ffh ;不顯示
mov dx,0201h
out dx,al
mov bl,sec
and bx,00f0h
mov cl,4
shr bx,cl
mov si,bx
mov al,situation[si] ;段碼
mov dx,0200h
out dx,al
mov al,0fdh ;秒十位
mov dx,0201h
out dx,al
call delay
mov al,0ffh ;不顯示
mov dx,0201h
out dx,al
mov al,40h ;段碼
mov dx,0200h
out dx,al
mov al,0fbh ;秒個位
mov dx,0201h
out dx,al
call delay
mov al,0ffh ;不顯示
mov dx,0201h
out dx,al
mov bl,min
and bx,000fh
mov si,bx
mov al,situation[si] ;段碼
mov dx,0200h
out dx,al
mov al,0f7h ;分個位
mov dx,0201h
out dx,al
call delay
mov al,0ffh ;不顯示
mov dx,0201h
out dx,al
mov bl,min
and bx,00f0h
mov cl,4
shr bx,cl
mov si,bx
mov al,situation[si] ;段碼
mov dx,0200h
out dx,al
mov al,0efh ;分十位
mov dx,0201h
out dx,al
call delay
mov al,0ffh ;不顯示
mov dx,0201h
out dx,al
mov al,40h ;段碼
mov dx,0200h
out dx,al
mov al,0dfh ;秒個位
mov dx,0201h
out dx,al
call delay
mov al,0ffh ;不顯示
mov dx,0201h
out dx,al
mov bl,hou
and bx,000fh
mov si,bx
mov al,situation[si] ;段碼
mov dx,0200h
out dx,al
mov al,0bfh ;時個位
mov dx,0201h
out dx,al
call delay
mov al,0ffh ;不顯示
mov dx,0201h
out dx,al
mov bl,hou
and bx,00f0h
mov cl,4
shr bx,cl
mov si,bx
mov al,situation[si] ;段碼
mov dx,0200h
out dx,al
mov al,07fh ;時十位
mov dx,0201h
out dx,al
call delay
ret
disp endp
key proc near
mov dx,0600h
in al,dx
test al,01h
jnz nexthou
call disp ;消抖
call disp
call disp
mov dx,0600h
in al,dx
test al,01h
jnz nexthou
mov al,min
add al,1 ;分調整
daa
mov min,al
cmp min,60H
jb nexthou
mov min,0
nexthou: mov dx,0600h
in al,dx
test al,02h
jnz exitkey
call disp ;消抖
call disp
call disp
mov dx,0600h
in al,dx
test al,02h
jnz exitkey
mov al,hou
add al,1
daa ;時調整
mov hou,al
cmp hou,12H
jb nexthou
mov hou,0
exitkey:ret
key endp
delay proc near
push bx
push cx
mov bx,1
lp1: mov cx,469
lp2: loop lp2
dec bx
jnz lp1
pop cx
pop bx
ret
delay endp
.data
sec db 00h
min db 00h
hou db 11h
situation db 3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FH,40h ;共陰
sit_end=$
END

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_8253A_可調時鐘.rar (60.62 KB, 下載次數: 82)

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8086+8253A可調時鐘Proteus仿真程序

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