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<?xml-stylesheet type="text/xsl" href="https://community.arm.com/utility/feedstylesheets/rss.xsl" media="screen"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/" xmlns:wfw="http://wellformedweb.org/CommentAPI/"><channel><title>serial communication problem</title><link>https://community.arm.com/developer/tools-software/tools/f/keil-forum/40648/serial-communication-problem</link><description> 
Dear Friends 

 
i am using two LPC 1768. 

 
one for transmitting another one for receiving. 

 
in transmitting side i am using 14.7456 MHz crystal receiving side
i am using 12.000 MHz crystal. 

 
i want to communicate each other here without changing</description><dc:language>en-US</dc:language><generator>Telligent Community 10</generator><item><title>RE: serial communication problem</title><link>https://community.arm.com/thread/68804?ContentTypeID=1</link><pubDate>Fri, 18 Jul 2014 02:46:29 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:9e040f3d-722a-4bb4-bcc1-43dec49f5550</guid><dc:creator>ImPer Westermark</dc:creator><description>&lt;p&gt;&lt;p&gt;
Doesn&amp;#39;t the forumlas in the processor user manual cover how to
compute the baudrate? If the transmitter code can&amp;#39;t be changed but
you already claim it runs at 4800 baud, then you can ignore the
transmitter side and just figure out how to get 4800 baud with the
12MHz crystal.&lt;/p&gt;

&lt;p&gt;
By the way, you call one side &amp;quot;transmitter&amp;quot; and the other side
&amp;quot;receiver&amp;quot; - you only have one-way communication? A normal UART
supports duplex communication unless used with special hardware
driver chips intended for master/slave bus communication. So it&amp;#39;s
quite common to have the receiving side send back an acknowledge on
reception - the transmitting side can&amp;#39;t even know if the other side
is powered up or connected without some form of handshake or data
feedback.&lt;/p&gt;
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