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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>Access to ERAM in AT89C51CC03</title><link>https://community.arm.com/developer/tools-software/tools/f/keil-forum/37743/access-to-eram-in-at89c51cc03</link><description> 
The Atmel AT89C51CC03 contains 256 bytes of RAM and 2048 bytes of
ERAM 

 
What kind of memory access is the fastest? 
Is also the lower part (128 byes) of the RAM faster than the upper
part? 
How do I declare variables in the ERAM? 
 </description><dc:language>en-US</dc:language><generator>Telligent Community 10</generator><item><title>RE: Access to ERAM in AT89C51CC03</title><link>https://community.arm.com/thread/76145?ContentTypeID=1</link><pubDate>Thu, 03 Apr 2008 08:04:50 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:a761586b-a403-46a4-9753-976e0191aaa4</guid><dc:creator>Rob B</dc:creator><description>&lt;p&gt;&lt;p&gt;
Thank you for the quick answer!&lt;/p&gt;

&lt;p&gt;
Sorry for the basic quenstions, but I also looked at the &amp;#39;bible&amp;#39;
(but could not find the answers I was looking for...)&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: Access to ERAM in AT89C51CC03</title><link>https://community.arm.com/thread/51649?ContentTypeID=1</link><pubDate>Thu, 03 Apr 2008 06:51:57 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:19432693-b685-43e4-af98-c67aca65da6e</guid><dc:creator>erik  malund</dc:creator><description>&lt;p&gt;&lt;p&gt;
&lt;i&gt;What kind of memory access is the fastest?&lt;/i&gt;&lt;br /&gt;
fastest DATA, IDATA, XDATA slowest&lt;br /&gt;
&lt;i&gt;Is also the lower part (128 byes) of the RAM faster than the upper
part?&lt;/i&gt;&lt;br /&gt;
no, if you have IDATA in &amp;quot;&amp;quot; it does not get faster&lt;br /&gt;
&lt;i&gt;How do I declare variables in the ERAM?&lt;/i&gt;XDATA&lt;/p&gt;

&lt;p&gt;
before asking more &lt;b&gt;basic&lt;/b&gt; questions, rad &amp;quot;the bible&amp;quot; you
will get 99% of the answers.&lt;/p&gt;

&lt;p&gt;
Erik&lt;/p&gt;

&lt;p&gt;
here are the links to &amp;quot;the bible&amp;quot;&lt;br /&gt;
Chapter 1 - 80C51 Family Architecture:&lt;br /&gt;
&lt;a href="http://www.nxp.com/acrobat_download/various/80C51_FAM_ARCH_1.pdf"&gt;www.nxp.com/.../80C51_FAM_ARCH_1.pdf&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;
Chapter 2 - 80C51 Family Programmer&amp;acirc;&amp;euro;&amp;trade;s Guide and
Instruction Set:&lt;br /&gt;

&lt;a href="http://www.nxp.com/acrobat_download/various/80C51_FAM_PROG_GUIDE_1.pdf"&gt;www.nxp.com/.../80C51_FAM_PROG_GUIDE_1.pdf&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;
Chapter 3 - 80C51 Family Hardware Description:&lt;br /&gt;

&lt;a href="http://www.nxp.com/acrobat_download/various/80C51_FAM_HARDWARE_1.pdf"&gt;www.nxp.com/.../80C51_FAM_HARDWARE_1.pdf&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;
Erik&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item></channel></rss>