📄 单片机串行通讯应用源程序--单片机学习基地.mht
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 <img src=skin/blue/titletop.gif class=st_title> <font class=titlefont>当前位置：<a href=index.asp>本站首页</a>-<a href=study.asp>初学实战</a>-<a href=study.asp?class=13>串行通讯</b></font></font><span style='width="0"'></span><a href="" title=""></a></td><td class='4topright'></td></tr></table>
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<table><td height=5></td></table><div align=center><b><font color=#000000>单片机串行通讯应用源程序</font></b></div>
<table><td height=5></td></table><blockquote><p align=right>【字体：<a href="javascript:ContentSize(16)" class=menufont>大</a> <a href="javascript:ContentSize(14)" class=menufont>中</a> <a href="javascript:ContentSize(12)" class=menufont>小</a>】 </p><P>来源： 作者：</P>
<P> </P>
<P>//单片机串行能讯应用源程序</P>
<P> 许多数据采集系统都需要用到串口，串口的特点是：占用的硬件投资少，只需要很少的信号线，可以同步传输，也可以异步传送。传输数据的格式、速率可以变化。但是抗干扰性能不好，传输距离不够。本例程主要通过实验，演示串口通信的各种设置，上位机及其单片机的软件编程方法，数据的采集与处理等。也可以作为串口调试软件用。是一个非常实用的实验。能够方便地进行代码移植。 <BR> </P>
<P> org 00h <BR> jmp main</P>
<P><BR> org 23h ;串行中断入口地址<BR> jmp com_int ;串行中断服务程序</P>
<P>;*********** 主程序开始 ******************* <BR> org 30h </P>
<P> main:mov sp,#30h ;设置堆栈<BR> lcall rest ;初始化<BR> lcall comm ;串口初始化 <BR> jmp $ ;原地等待<BR>; ************* 初始化 *********************<BR> rest:mov p0,#00h ;禁止数码管显示<BR> mov p2,#255<BR> mov p1,#255 ;禁止LED显示 <BR> RET ;返回<BR>;************** 串口初始化 *****************<BR>;设置串行口工作方式1，定时器1作为波特率发生器<BR>;波特率设置为 2400 ;<BR> comm:mov tmod,#20h ;设置定时器T1工作方式2<BR> mov tl1,#0f2h ;定时器计数初值，波特率 2400 <BR> mov th1,#0f2h ;定时器重装值 <BR> setb ea ;允许总的中断<BR> setb es ;允许串行中断<BR> mov pcon,#00h ;波特率不倍增<BR> mov scon,#50h ;设置串口工作方式1,REN = 1 允许接收 <BR> setb tr1 ;定时器开始工作<BR> ret ;返回 <BR>;*************** 串口中断服务程序 ***********<BR>; 如果接收 0FF 表示上位机需要联机信号，单片机发送 0FFH作为<BR>; 应答信号,如果接收到 数字 1~ n，表示相应的功能；<BR>; 这里，如果收到 1 ，则单片机向计算机发送字符 'm'; <BR>; 如果收到 2 ，则单片机向计算机发送字符 'c';<BR>; 如果收到其他的数据，则发送 'u';<BR> com_int:clr es ;禁止串行中断 <BR> clr ri ;清除接收标志位<BR> mov a,sbuf ;从缓冲区取出数据 <BR> cjne a,#0ffh,in_1 ;检查数据<BR> mov sbuf,#255 ;收到联机信号，发送联机信号 <BR> jnb ti,$ ;等待发送完毕<BR> clr ti ;清除发送标志<BR> setb es ;允许串行中断 <BR> reti ;中断返回 <BR> in_1:cjne a,#01,in_2 ;如果收到1<BR> mov sbuf,'m' ;发送 'm'<BR> jnb ti,$ ;等待发送完毕<BR> clr ti ;清除发送中断标志<BR> setb es ;允许串行中断 <BR> reti ;中断返回 <BR> in_2:cjne a,#02,in_3 ;接收到 2 <BR> mov sbuf,'c' ;发送 'c' <BR> jnb ti,$ ;等待发送完毕<BR> clr ti ;清除发送中断<BR> setb es ;允许串行中断<BR> reti ;中断返回 <BR> in_3:mov sbuf,'u' ;收到其他数据，发送'u'<BR> jnb ti,$ ;等待发送完毕 <BR> clr ti ;清除发送中断标志<BR> setb es ;允许串行中断 <BR> reti ;返回<BR> end<BR> <BR></P><p align=center>欢迎大家进入<a <a href=bbs><font color=##ff0000>基地论坛</a><font color=##000000>讨论!</font></p>
<p align=center></font> 添加时间：<font color="#FF0000">2006-12-30</font> 阅读：<font color="#FF0000">470</font>次</font></p>
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