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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>storing variables in ROM</title><link>https://community.arm.com/developer/tools-software/tools/f/keil-forum/19459/storing-variables-in-rom</link><description> I am designing a 8051 based system(89c51 is used). In the system I want to store a variable whose value will be changed time to time by the end user. I thought of going for external flash memory chip to store such variables. Which chip i have to use</description><dc:language>en-US</dc:language><generator>Telligent Community 10</generator><item><title>RE: storing variables in ROM</title><link>https://community.arm.com/thread/87559?ContentTypeID=1</link><pubDate>Fri, 27 Jan 2006 10:41:02 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:02c673ac-96e9-4fd7-a9a2-24b665d3bea1</guid><dc:creator>Andy Neil</dc:creator><description>&lt;p&gt;&lt;i&gt;&amp;quot;Which chip i have to use so that I can store and access these variables as if it is in external RAM&amp;quot;&lt;/i&gt;&lt;br /&gt;
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&lt;i&gt;&amp;quot;a &lt;/i&gt;&lt;b&gt;parallel&lt;/b&gt; flash&amp;quot;&lt;br /&gt;
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It doesn&amp;#39;t &lt;i&gt;have&lt;/i&gt; to be parallel!&lt;br /&gt;
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See: &lt;a href="http://www.keil.com/forum/docs/thread6729.asp"&gt;http://www.keil.com/forum/docs/thread6729.asp&lt;/a&gt;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: storing variables in ROM</title><link>https://community.arm.com/thread/45456?ContentTypeID=1</link><pubDate>Fri, 27 Jan 2006 09:54:41 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:ac55ba46-cf4d-40e0-b411-83584d5a6115</guid><dc:creator>erik  malund</dc:creator><description>&lt;p&gt;&lt;i&gt;storing variables in ROM&lt;/i&gt;&lt;br /&gt;
How do you propose to stare valued in a &lt;b&gt;R&lt;/b&gt;ead &lt;b&gt;O&lt;/b&gt;nly &lt;b&gt;M&lt;/b&gt;emory?&lt;br /&gt;
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89c51 is totally non-descriptive, all derivatives are different, give the manufacturer and full type.&lt;br /&gt;
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If only a few variables many &amp;quot;internal&amp;quot; means exist if you choose the right processor.&lt;br /&gt;
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&lt;i&gt;I thought of going for external flash memory chip to store such variables.&lt;/i&gt;&lt;br /&gt;
most use a serial EEPROM for such.&lt;br /&gt;
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&lt;i&gt;Which chip i have to use so that I can store and access these variables as if it is in external RAM&lt;/i&gt;&lt;br /&gt;
a &lt;b&gt;parallel&lt;/b&gt; flash&lt;br /&gt;
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Erik&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item></channel></rss>