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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>how can i view  the total  512 BYTE RAM?</title><link>https://community.arm.com/developer/tools-software/tools/f/keil-forum/14431/how-can-i-view-the-total-512-byte-ram</link><description> I select a chip which has 512 BYTE RAM, 
but i only can watch the content of low 
128 BYTE RAM. 
 
 thanks for your help. 
 </description><dc:language>en-US</dc:language><generator>Telligent Community 10</generator><item><title>RE: how can i view  the total  512 BYTE RAM?</title><link>https://community.arm.com/thread/53878?ContentTypeID=1</link><pubDate>Tue, 18 Sep 2001 09:19:38 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:c812a024-3621-4dc1-abaf-badb5c82712e</guid><dc:creator>Jon Ward</dc:creator><description>&lt;p&gt;Note that on the 8051 devices that &amp;quot;say&amp;quot; they have 512 or 1024 bytes of RAM, this is not an accurate statement.&lt;br /&gt;
&lt;br /&gt;
What they MEAN is that they have 256 bytes of DATA memory and 256 bytes of XDATA memory.&lt;br /&gt;
&lt;br /&gt;
The reason you can&amp;#39;t view 512 bytes of DATA memory is because the address of DATA is limited to 8 bits (256 bytes).&lt;br /&gt;
&lt;br /&gt;
You&amp;#39;ll just have to look at the memory the way it is implemented--as 2 separate memory areas.&lt;br /&gt;
&lt;br /&gt;
Take a look at the following knowledgebase article for more information:&lt;br /&gt;
&lt;br /&gt;
&lt;a href="http://www.keil.com/support/docs/302.htm"&gt;http://www.keil.com/support/docs/302.htm&lt;/a&gt;&lt;br /&gt;
&lt;br /&gt;
&lt;b&gt;Jon&lt;/b&gt;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: how can i view  the total  512 BYTE RAM?</title><link>https://community.arm.com/thread/37879?ContentTypeID=1</link><pubDate>Tue, 18 Sep 2001 03:49:57 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:45fa4aaf-ad9a-4a2f-a8a6-2fd3b69e9b2a</guid><dc:creator>Andrew Neil</dc:creator><description>&lt;p&gt;Please select the appropriate &lt;b&gt;Product&lt;/b&gt; when making a post!&lt;br /&gt;
&lt;br /&gt;
I presume you&amp;#39;re talking C51?&lt;br /&gt;
&lt;br /&gt;
Read the section &lt;i&gt;&amp;quot;Internal Data Memory&amp;quot;&lt;/i&gt; in the manual (C51 User&amp;#39;s Guide; C51.pdf).&lt;br /&gt;
&lt;br /&gt;
Manuals are accessible via the &amp;#39;Books&amp;#39; tab in the uVision Project window.&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item></channel></rss>