液晶显示器分很多种类，按显示方式可分为段式，行点阵式和全点阵式。

段式与数码管类似，行点阵式一般是英文字符，全点阵式可显示任何信息，

如汉字、图形、图表等。这里我们介绍一种八段式四位LCD显示器，该显

示器内置驱动器，串行数据传送，使用非常方便。原理图如下图：

下图是长沙太阳人科技开发有限公司生产的4位带串行接口的液晶显示模块SMS0403

的外部引线简图：

有关该模块的具体参数，请查看该公司网站。此例中使用的温度传感器

为美国DALLAS公司生产的单总线式数字温度传感器。该传感器本站有其

详细的资料可供下载。此例稍加改动，即可做成温控器。

下载驱动该模块的源程序LCD.PLM

例2:

saved from url=(0044)http://go18.163.com/_NTES/~jlsplhd/cxyd7.htm             LED显示电脑电子钟

本例介绍一种用LED制作的电脑电子钟（电脑万年历）。其制作

完成装潢后的照片如下图：

上图中，年、月、日及时间选用的是1.2寸共阳数码管，星期选用

的是2.3寸数码管，温度选用的是0.5寸数码管，也可根据个人的爱好

选用不同规格的数码管。原理图如下图所示：

上图中，CPU选用的是AT89C2051,时钟芯片选用的是Dallas公司的DS1302,

温度传感器选用的是Dallas公司的数字温度传感器DS1820，显示驱动芯片

选用的是德州仪器公司的TPIC6B595,也可选用与其兼容的芯片NC595或

国产的AMT9595。整个电子钟用两个键来调节时间和日期。一个是位选

键，一个是数字调节键。按一下位选键，头两位数字开始闪动，进入设

定调节状态，此时按数字调节键，当前闪动位的数字就可改变。全部参

数调节完后，五秒钟内没有任何键按下，则数字停止闪动，退出设定调

节状态。源程序清单如下(无温度显示程序）：

start:do;
$include(reg51.dcl)
  declare (sclk,io,rst) bit at (0b3h) register; /* p33,p34,p35 */
  declare (command,data,n,temp1,num) byte;
  declare a(9) byte;
  declare ab(6) byte;
  declare aco(11) byte constant (0fdh,60h,0dah,0f2h,66h,0b6h,0beh,  
				  0e0h,0feh,0f6h,00h);            
  declare week(11) byte constant (0edh,028h,0dch,7ch,39h,75h,0f5h,
				  2ch,0fdh,7dh,00h);
  declare da literally 'p15',clk literally 'p16',ale literally 'p17',
	  mk literally 'p11',sk literally 'p12';

clear:procedure;
	  sclk=0;io=0;rst=0;
end clear;

send1302:procedure(comm);
	   declare (i,comm) byte;
  do i=0 to 7;
	 comm=scr(comm,1);
	 io=cy;
	 call time(1);
	 sclk=0;
	 call time(1);
	 sclk=1;
  end;
end send1302;
wbyt1:procedure(com,dat);/*字节写过程*/
  declare (com,dat) byte;
  call clear;
  rst=1;
  call send1302(com);
  call send1302(dat);
  call clear;
end wbyt1;
wbyt8:procedure;/*时钟多字节突发模式写过程*/
  declare j byte;
  call clear;
  a(7)=A(6);a(6)=a(0);
  rst=1;
  call send1302(command);
  do j=1 to 8;
	  call send1302(a(j));
  end;
  call clear;
end wbyt8;

RBYT1:PROCEDURE;
	  DECLARE I BYTE;
	 CALL CLEAR;
	 RST=1;
	  call send1302(0c1h);
	  IO=1;
	  DO I=0 TO 7;
	   SCLK=1;
	   SCLK=0;
	   CY=IO;
	   N=SCR(N,1);
	  END;
	  A(8)=N;
   CALL CLEAR;
END RBYT1;
send595:procedure;
	declare k byte;
	 do k=0 to 7;
	data=scr(data,1);
	da=cy;
	clk=1;
	clk=0;
	 end;
end send595;

send595_1:procedure;
	declare k byte;
	 do k=0 to 7;
	data=scr(data,1);
	da1=cy;
	clk1=1;
	clk1=0;
	 end;
end send595_1;

rb1:procedure(abc,j);
	 DECLARE (I,j,abc) BYTE;
	 CALL CLEAR;
	 RST=1;
	  call send1302(abc);
	  IO=1;
	  DO I=0 TO 7;
	   SCLK=1;
	   SCLK=0;
	   CY=IO;
	   N=SCR(N,1);
	  END;
	  ab(j)=N;
	  ab(j)=dec(ab(j));
   CALL CLEAR;
end rb1;

rbyt6:procedure;
   call rb1(0f1h,0);
   call rb1(0f3h,1);
   call rb1(0f5h,2);
   call rb1(0f7h,3);
   call rb1(0f9h,4);
   call rb1(0fbh,5);
   call rb1(0fdh,6);
end rbyt6;

wbyt6:procedure;
 call wbyt1(8eh,0);  /* write enable */
   call wbyt1(0f0h,ab(0));
   call wbyt1(0f2h,ab(1));
   call wbyt1(0f4h,ab(2));
   call wbyt1(0f6h,ab(3));
   call wbyt1(0f8h,ab(4));
   call wbyt1(0fah,ab(5));
   call wbyt1(0fch,ab(6));
 call wbyt1(8eh,80h);  /* write disable */
end wbyt6;
rbyt8:procedure;/*时钟多字节突发模式读过程*/
  declare (i,j) byte;
  call clear;
  rst=1;
  call send1302(command);
	  io=1;
  do j=1 to 8;
	do i=0 to 7;
	   sclk=1;
	   call time(1);
	   sclk=0;
	cy=io;
	   n=scr(n,1);
	 end;
	 a(j)=n;
  end;
  call clear;
  a(0)=a(6);a(6)=A(7);
  a(0)=a(0) and 0fh;
  if a(0)>6 then a(0)=0;
  CALL RBYT1;
	  if (a(1)=0 and a(2)=0 and a(3)=0) then 
	  do;
		 do num=0 to 35;
		call time(250);
		 end;
		 temp1=1;
	   end;
	   if temp1=1 then
	  do;
		temp1=0;
		ab(4)=ab(4)+1;
		   if ab(4)>99h then 
		  do;
			ab(4)=0;
			ab(5)=ab(5)+1;
			if ab(5)>99h then ab(5)=0;
		  end;
		  call wbyt6;
	  end;
end rbyt8;

display:procedure;  /*jieya,yima,fasong*/
  declare (i,n,m) byte;
	n=a(0) and 0fh; /* send week */
	data=week(n);
	call send595;

	  n=a(4);          /* send date */
	  n=n and 0fh;
	  data=aco(n);
	  call send595;
	  n=a(4);
	  n=shr(n,4);
	  data=aco(n);
	  call send595;

 do i=1 to 3;     /* send second,minute,hour */
	n=a(i);
	n=n and 0fh;
	data=aco(n);
	call send595;
	n=a(i);
	n=shr(n,4);
	data=aco(n);
	call send595;
  end;
 do i=5 to 6;     /* send month,year */
	n=a(i);
	n=n and 0fh;
	data=aco(n);
	call send595;
	n=a(i);
	n=shr(n,4);
	data=aco(n);
	call send595;
  end;

	  n=a(8);         /*  send 19 or 20 */
	  n=n and 0fh;
	  data=aco(n);
	  call send595;
	  n=a(8);
	  n=shr(n,4);
	  data=aco(n);
	  call send595;
  do m=0 to 5;
	n=ab(m);
	n=n and 0fh;
	data=aco(n);
	call send595_1;
	n=ab(m);
	n=shr(n,4);
	data=aco(n);
	call send595_1;
  end;  
	ale=0;
	ale=1;
end display;

beginset:procedure;
	a(0)=06h;a(1)=58h;a(2)=59h;a(3)=23h;
	a(4)=30h;a(5)=06h;a(6)=97h;a(7)=00;
	a(8)=19h;   /* set date/time (1997,7,1,8:00:00,week 3) */
	call wbyt1(8eh,0); /* write enable*/
	call wbyt1(80h,00h);/* start colock */
	call wbyt1(0beh,0abh);/*两个二极管与8K电阻串联充电*/
	command=0beh;  /* write colock/date */
	call wbyt8;
	call wbyt1(0c0h,a(8));
	call wbyt1(8eh,80h);  /* set write protect bit */
end beginset;

key:procedure;
	declare (i,time1,k1,tem) byte;
	call time(100);
	k1=7;time1=30;
	if mk=0 then
	  do;
	do while time1>0;
week:       if k1=0 then
		  do;  
		do i=0 to 5;
		  /*    call hz(a(0));  */
		end;
		do i=0 to 3;
		  /*    call hz0;  */
		end;
		   end;
		  tem=a(k1);
		 if k1=7 then tem=a(8);
		 a(k1)=0aah;
		if k1=7 then a(8)=0aah;
		call display;
		call time(254);
		call time (254);
		a(k1)=tem;
		if k1=7 then a(8)=tem;
		call display;
		call time(254);
		call time(254);
		call time(254);
		time1=time1-1;
	if mk=0 then
		 do;call time(100); /*MOD KEY PROCESS*/
		   TIME1=30;
		   IF MK=0 THEN
		DO;
		  k1=k1-1;
		 DO WHILE K1=0FFH;
		  K1=7;
		 END;
		END;
		 end;
	 IF SK=0 THEN
		 DO;CALL TIME(100);  /*SET KEY PROCESS*/
		   TIME1=30;
		   IF SK=0 THEN
		   DO;
		tem=tem+1;
		tem=dec(tem);
		DO CASE K1;
			  DO WHILE tem=7;/*week*/
	              	     tem=0;
			  END;
			  DO WHILE tem=60H;/*scond*/
	                      tem=0;
			  END;
			  DO WHILE tem=60H;/*minute*/
			        tem=0;
			  END;
			  DO WHILE tem=24H;/*hour*/
			     tem=0;
			  END;
			  DO WHILE tem=32H;/*date*/
			     tem=1;
			  END;
			  DO WHILE tem=13H;/*month*/
			     tem=1;
			  END;
			  DO while tem=100h;   /*  YEAR */
			     tem=00;
			  END;
			  DO WHILE TEM>=21H;
			     tem=19H;
			  END;
		   END;
		   A(K1)=tem;
		   if k1=7 then a(8)=tem;
		END;
	  END;
	   END;
	 END;
end key;

main$program:
mk=1;sk=1;temp1=0;num=0;p32=1;
if sk=0 then call beginset;
clk=0;da=0;ale=1;
loop:
  do while mk=1 ;
	 if a(0)>6 then a(0)=0; 
	 command=0bfh; 
	 call rbyt8;
	 call display;
    do while mk=0;
	call key;
	call wbyt1(8eh,0);
	command=0beh;
	call wbyt8;
	call wbyt1(0C0H,A(8));
	call wbyt1(8eh,80h);
   end;
 end;
goto loop;
end start;

例3:

saved from url=(0044)http://go18.163.com/_NTES/~jlsplhd/cxyd5.htm              一个6位LED、4个按键的显示板

   按键和显示是单片机系统的基本输入输出部件，下面介绍一

个由74LS164驱动的6位数码管和4个按键组成的通用仪表面板。

原理图如下图所示：

其线路板图如下图所示：

注：此板中多了三个LED发光管，这三个发光管是分别接在IC4,IC5,IC6 的13脚（Q7，数据

串出脚）上的。