实现特定功能的键盘及LED显示

1、实现特定功能的键盘及LED显示了解键盘及LED显示接口原理，设计实验电路图完成以下功能:1. 按1键显示年；2. 按2键显示月曰；3. 按3键显示GOOD;4. 按4键数码管由左到右字符“如环显示。5. 自行设计特效显示功能。codesegmentassumecs:code,ds:codestart:movax,csmovds,axinput:callkeyboardleasi,keybuffer;取按键的值moval,sicmpal,1jnzL0jmpshow_year;显示年L0:cmpal,2jnzL1jmpshow_md;显示月日L1:cmpal,3jnzL2jmpshow_good;

2、显示goodL2:cmpal,4jnzL3jmpshow_0;由左到右字符"0"循环显示L3:cmpal,7jnzL4jmpshow_sun;显示sunL4:jmpshow_hero;显示hero;结束;显示年开始show_year:movch,01111111b;初始化位选码01111111Bmovbh,11110111b;显示位选结束位leasi,yearbuffercalldisplaydeccount;重复显示count次jnzshow_yearmovcount,250jmpinput;结束;显示月开始show_md:movch,01111111b;初始化位选码01

3、111111Bmovbh,11110111b;显示位选结束位leasi,mdbuffercalldisplaydeccount;重复显示count次jnzshow_mdmovcount,250jmpinput;结束;显示goodshow_good:movch,01111111b;初始化位选码01111111Bmovbh,11110111b;显示位选结束位leasi,goodbuffercalldisplaydeccount;重复显示count次jnzshow_goodmovcount,250jmpinput;结束;显示heroshow_hero:DE:movch,01111111B;初始化位选

4、码01111111Bleasi,herobuffermovbh,11110111B;显示位选结束位calldisplaydeccount;重复显示count次jnzshow_heromovcount,10decxunmovcount,10callshowdelay_hcmpxun,00h;闪光显示jnzDEmovxun,15movcount,250jmpinput;结束；显示由左至m字符“°”循环show_0:movbx,3Lshow0:movch,01111111b;初始化位选码01111111leadi,linbuffermoval,80hmovdx,203houtdx,al;再

5、次初始化8255display_0:moval,chmovdx,202houtdx,al;位选码送pc口moval,dimovdx,200h;moval,5bhoutdx,al;显示段码callshowdelay0rorch,1;指向下一个数码管cmpch,11110111bjnzdisplay_0decbx;重复显示3次jnzLshow0jmpinput;结束;显示sunshow_sun:movch,01111111b;初始化位选码01111111bmovbh,11101111b;显示位选结束位leasi,sunbuffercalldisplaydeccount;重复显示count次jnzs

6、how_sunmovcount,250jmpinput;结束;显示延时showdelayprocnearpushbxpushcxmovbx,10showdell:movcx,100showdel2:loopshowdel2decbxjnzshowdel1popcxpopbxretshowdelayendp;结束;显示延时0showdelay0procnearpushbxpushcxmovbx,100show0del1:movcx,2000show0del2:loopshow0del2decbxjnzshow0del1popcxpopbxretshowdelay0endp;结束showdelay

7、_hprocnearpushbxpushcxmovbx,10show_hdel1:movcx,2000show_hdel2:loopshow_hdel2decbxjnzshow_hdel1popcxpopbxretshowdelay_hendp;显示程序displayprocnearmoval,80hmovdx,203houtdx,al;再次初始化8255display1:moval,chmovdx,202houtdx,al;位选码送pc口moval,simovdx,200houtdx,al;显示段码callshowdelay;延时incsirorch,1;指向下一个数码管cmpch,bhjn

8、zdisplay1retdisplayendp;结束;读取按键盘keyboardprocnearleasi,keybuffermoval,10000001b;初始化8255控制字movdx,203houtdx,alks1:callks;读取按键cmpal,0fh;判断有无按键jzks1calldelaycallkscmpal,0fhjzks1movbl,0efh;初始化列码movbh,0;初始化列计数器again:movdx,202hmoval,bloutdx,al;输出列码inal,dx;读取行码andal,0fhcmpal,0fhjznext;该列无键闭合，准备下一列扫描cmpal,0dh

9、;判断列是否是第一个键闭合？jnztwomoval,1jmpfreetwo:;判断列是否是第二个键闭合？cmpal,0bhjnzthreemoval,4jmpfreethree:;判断列是否是第三个键闭合？cmpal,07hjnznextmoval,7free:pushaxwait1:callkscmpal,0fhjnzwait1popaxaddal,bhmovsi,al;保存键值，并返回jmpreturnnext:incbhrolbl,1cmpbl,0fehjnzagainjmpks1ksprocnearmovdx,202hmoval,0fhoutdx,alinal,dxandal,0fhr

10、etksendpdelayprocnearpushbxpushcxmovbx,2000dell:movcx,10del2:loopdel2decbxjnzdel1popcxpopbxretdelayendpreturn:retkeyboardendpexit:movah,4chint21hxundb15yearbufferdb5BH,3FH,3FH,6FH;存放年2009mdbufferdb3FH,6FH,3FH,66H;存放月日0904goodbufferdb6FH,5CH,5CH,5EH;goodkeybufferdb1linbufferdb3FHherobufferdb76h,79h,77h,3fh;herosunbufferdb6DH,3EH,37H;SUNcountdb250;显示次数结束codeendsendstartyuuii8255模块电路原理图三三二三二三疆需薰慕PBO薰检很PB7籍高PC4PC5M亘AOAlR£SO亟oWffoAOOAlORESETocmAAAAAAQbQbQ6Q8