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作者：佚名 转贴自：本站原创 点击数：72 更新时间：2005-4-28 文章录入：<A
href="http://www.robotsky.com/UserInfo.asp?UserID=14">jones</A>
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<DIV align=left>利用启点开发板可以很容易的完成LCD显示,具体如下:</DIV>
<DIV
align=left>1602采用标准的14脚接口，其中:<BR><BR>第1脚：VSS为地电源<BR><BR>第2脚：VDD接5V正电源<BR><BR>第3脚：V0为液晶显示器对比度调整端，接正电源时对比度最弱，接地电源时对比度最高，对比度过高时会产生“鬼影”，使用时可以通过一个10K的电位器调整对比度<BR><BR>第4脚：RS为寄存器选择，高电平时选择数据寄存器、低电平时选择指令寄存器。<BR><BR>第5脚：RW为读写信号线，高电平时进行读操作，低电平时进行写操作。当RS和RW共同为低电平时可以写入指令或者显示地址，当RS为低电平RW为高电平时可以读忙信号，当RS为高电平RW为低电平时可以写入数据。<BR><BR>第6脚：E端为使能端，当E端由高电平跳变成低电平时，液晶模块执行命令。<BR><BR>第7～14脚：D0～D7为8位双向数据线。
</DIV>
<DIV
align=left>另外引脚"A"和"K"为背光引脚,"A"接正,"K"接负便会点亮背光灯.<BR><BR> 1602液晶模块内部的字符发生存储器（CGROM)已经存储了160个不同的点阵字符图形，如表1所示，这些字符有：阿拉伯数字、英文字母的大小写、常用的符号、和日文假名等，每一个字符都有一个固定的代码，比如大写的英文字母“A”的代码是01000001B（41H），显示时模块把地址41H中的点阵字符图形显示出来，我们就能看到字母“A”
</DIV>
<DIV align=left><BR><A
href="1602 LCD显示实验.files/200542812710734.gif"
target=_blank><IMG alt=按此在新窗口浏览图片
src="1602 LCD显示实验.files/200542812710734.gif"
width=500
onload="javascript:if(this.width>screen.width-300)this.width=screen.width-300"
align=left border=0></A><BR>
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<P>1602液晶模块内部的控制器共有11条控制指令，如表2所示，<BR><A
href="1602 LCD显示实验.files/200542812710621.gif"
target=_blank><IMG alt=按此在新窗口浏览图片
src="1602 LCD显示实验.files/200542812710621.gif"
width=500
onload="javascript:if(this.width>screen.width-300)this.width=screen.width-300"
align=left border=0></A><BR></P>
<P> </P>
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<DIV
align=left>它的读写操作、屏幕和光标的操作都是通过指令编程来实现的。（说明：1为高电平、0为低电平）
<BR><BR>指令1：清显示，指令码01H,光标复位到地址00H位置<BR><BR>指令2：光标复位，光标返回到地址00H
<BR><BR>指令3：光标和显示模式设置 I/D：光标移动方向，高电平右移，低电平左移
S:屏幕上所有文字是否左移或者右移。高电平表示有效，低电平则无效 <BR><BR>指令4：显示开关控制。
D：控制整体显示的开与关，高电平表示开显示，低电平表示关显示
C：控制光标的开与关，高电平表示有光标，低电平表示无光标 B：控制光标是否闪烁，高电平闪烁，低电平不闪烁
<BR><BR>指令5：光标或显示移位 S/C：高电平时移动显示的文字，低电平时移动光标
<BR><BR>指令6：功能设置命令 DL：高电平时为4位总线，低电平时为8位总线
N：低电平时为单行显示，高电平时双行显示 F: 低电平时显示5x7的点阵字符，高电平时显示5x10的点阵字符
<BR><BR>指令7：字符发生器RAM地址设置 <BR><BR>指令8：DDRAM地址设置
<BR><BR>指令9：读忙信号和光标地址
BF：为忙标志位，高电平表示忙，此时模块不能接收命令或者数据，如果为低电平表示不忙。
<BR><BR>指令10：写数据 <BR><BR>指令11：读数据 <BR></DIV>
<P>液晶显示模块是一个慢显示器件，所以在执行每条指令之前一定要确认模块的忙标志为低电平，表示不忙，否则此指令失效。要显示字符时要先输入显示字符地址，也就是告诉模块在哪里显示字符，表3是DM-162的内部显示地址.<BR><A
href="1602 LCD显示实验.files/200542812711371.gif"
target=_blank><IMG alt=按此在新窗口浏览图片
src="1602 LCD显示实验.files/200542812711371.gif"
width=500
onload="javascript:if(this.width>screen.width-300)this.width=screen.width-300"
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