微機(jī)課程設(shè)計(jì)--簡(jiǎn)易電子廣告牌設(shè)計(jì)-資料下載頁
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【正文】 loop next1 pop cx loop d22 mov al,00 。關(guān)閉顯示，消隱 mov dx,addcolor out dx,al mov ah,01 。判斷是否有鍵按下，有則返回DOS int 16h jz nextch MOV AH,4CH 。返回 INT 21Hsishu:mov mflag,01h jmp nextch danshu:mov mflag,00h jmp nextch shuru: 。實(shí)現(xiàn)對(duì)按鍵單次檢測(cè) MOV AH,01H INT 16H jz shuru 。判斷有鍵按下才掃描鍵值 MOV ah,00h int 16h mov ah,0 SUB AL,30H mov COUNTTMP,ax 。對(duì)ASCII碼處理為09 MOV AH,01H 。檢測(cè)是否有鍵按下,沒有則退出子程序 INT 16H jnz shuru test mflag,01h jnz sishu jmp nextch。******************讀取244子程序**************************ReadKey PROC NEAR mov dx,ls244 。從2A0輸入一數(shù)據(jù) in al,dx mov dl,al 。將所讀數(shù)據(jù)保存在DL中 retReadKey ENDP。******************8253初始化子程序************************Int8253 PROC NEAR mov dx,io8253c 。向8253寫控制字 mov al,0b6h 。使2通道為工作方式3 out dx,al mov ax,1000 。寫入循環(huán)計(jì)數(shù)初值1000 mov dx,io8253a out dx,al 。先寫入低字節(jié) mov al,ah out dx,al 。后寫入高字節(jié) mov dx,io8253c mov al,76h 。設(shè)8253通道1工作方式2 out dx,al mov ax,5000 。寫入循環(huán)計(jì)數(shù)初值1000 mov dx,io8253b out dx,al 。先寫低字節(jié) mov al,ah out dx,al 。后寫高字節(jié) retINT8253 ENDP。******************軟件延遲子程序************************DELAYlong PROC NEAR push cx mov cx,0ffffhtimeb: loop timeb mov cx,0ffffhtimec: loop timec pop cx retDELAYlong ENDP。***********************代碼段結(jié)束*************************CODE ENDSEND START。*********************************************************10
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