<?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>how to assign the port as an  input port</title><link>https://community.arm.com/developer/tools-software/tools/f/keil-forum/37256/how-to-assign-the-port-as-an-input-port</link><description> 
for using keil cx51 version 
 </description><dc:language>en-US</dc:language><generator>Telligent Community 10</generator><item><title>RE: how to assign the port as an  input port</title><link>https://community.arm.com/thread/50728?ContentTypeID=1</link><pubDate>Wed, 09 May 2007 06:35:25 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:bfab35ad-95c6-411b-a416-500c8099a40c</guid><dc:creator>Andy Neil</dc:creator><description>&lt;p&gt;&lt;p&gt;
8051 ports are &lt;i&gt;Quasi-bidirectional&lt;/i&gt; - they are not
assignable as &amp;quot;Input&amp;quot; or &amp;quot;Output&amp;quot;&lt;/p&gt;

&lt;p&gt;
This is a hardware issue - it makes no difference what programming
language you use!&lt;/p&gt;

&lt;p&gt;
Time to study the so-called &amp;quot;bible&amp;quot; for the 8051:&lt;/p&gt;

&lt;p&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;#39;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;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item></channel></rss>