<?xml version="1.0" encoding="UTF-8" ?>
<?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>Problem in using  AT89C52</title><link>https://community.arm.com/developer/tools-software/tools/f/keil-forum/42304/problem-in-using-at89c52</link><description> Hi there, 
 
i have problem in using AT89C52. When i used this ic, my board is not working at retrieving data and sending data to pc. Previously i have done using 8051 in demoboard and it works fine. 
 
For this AT89C52 i have included the library file</description><dc:language>en-US</dc:language><generator>Telligent Community 10</generator><item><title>RE: Problem in using  AT89C52</title><link>https://community.arm.com/thread/110778?ContentTypeID=1</link><pubDate>Tue, 09 Mar 2004 23:12:37 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:673cceca-e3b0-45df-b6d6-02b99ed49f7b</guid><dc:creator>NORE NORE</dc:creator><description>&lt;p&gt;hi there,&lt;br /&gt;
&lt;br /&gt;
yes it means these cap. actually i have discovered that my databus lines no connectivity . once the databus lines are connected, my board working fine.&lt;br /&gt;
&lt;br /&gt;
Anyway thank-you very much.&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: Problem in using  AT89C52</title><link>https://community.arm.com/thread/96167?ContentTypeID=1</link><pubDate>Tue, 09 Mar 2004 07:28:47 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:31c6d9c4-03eb-46d4-98c2-15b42826d0cf</guid><dc:creator>erik  malund</dc:creator><description>&lt;p&gt;&lt;i&gt;this cap 33pF&lt;/i&gt;&lt;br /&gt;
I hope you mean &lt;i&gt;these&lt;/i&gt; cap&lt;i&gt;s&lt;/i&gt;.&lt;br /&gt;
&lt;br /&gt;
Erik&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: Problem in using  AT89C52</title><link>https://community.arm.com/thread/96169?ContentTypeID=1</link><pubDate>Tue, 09 Mar 2004 00:38:52 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:98e812ba-79af-4c73-bba7-3d12f8e88441</guid><dc:creator>Andy Neil</dc:creator><description>&lt;p&gt;&lt;i&gt;&amp;quot;In the Target device option there is a Xtal setting, the default setting is 24MHz, but i have change it to 11.0592MHz following my crystal usage. is this ok?&amp;quot;&lt;/i&gt;&lt;br /&gt;
&lt;br /&gt;
This has no effect whatsoever on your code or your processor - it is only used by the uVision simulator.&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: Problem in using  AT89C52</title><link>https://community.arm.com/thread/72330?ContentTypeID=1</link><pubDate>Mon, 08 Mar 2004 19:54:26 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:f34ee7b0-0d82-4e76-b590-17d84af63694</guid><dc:creator>NORE NORE</dc:creator><description>&lt;p&gt;Hi there,&lt;br /&gt;
&lt;br /&gt;
Pin 18 is XTAL2. For good board (8051) i do observed oscillation signal. but for this AT89C52 i do not observed any signal on pin 18.i have checked the connectivity of this cap 33pF and the crystal , all components are connected to this ic. this crystal is working fine. i downloaded the hex code using chipmax programmer.&lt;br /&gt;
&lt;br /&gt;
In the Target device option there is a Xtal setting, the default setting is 24MHz, but i have change it to 11.0592MHz following my crystal usage. is this ok?&lt;br /&gt;
&lt;br /&gt;
is there any more setting that i should use on this keil program?? plse help.&lt;br /&gt;
&lt;br /&gt;
thanks&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: Problem in using  AT89C52</title><link>https://community.arm.com/thread/41823?ContentTypeID=1</link><pubDate>Mon, 08 Mar 2004 10:42:01 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:5265c24a-bacf-453c-a082-1b31984e6ef4</guid><dc:creator>erik  malund</dc:creator><description>&lt;p&gt;&lt;i&gt;there is no oscillation signal at pin 18&lt;/i&gt;&lt;br /&gt;
since you do not specify the package &amp;quot;pin 18&amp;quot; is meaningless, but if is XTAL1 or XTAL2 there is only the following possibilities:&lt;br /&gt;
1)bad connection crystal or 33pf caps&lt;br /&gt;
2) Vcc or Gnd missig to the chip&lt;br /&gt;
3) bum chip&lt;br /&gt;
&lt;br /&gt;
There is NO way you can kill the oscillator in a working circuit.&lt;br /&gt;
&lt;br /&gt;
Erik&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item></channel></rss>