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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>writing to a port which is not available</title><link>https://community.arm.com/developer/tools-software/tools/f/keil-forum/32373/writing-to-a-port-which-is-not-available</link><description> 
Hello, 

 
we have a small software (bootloader) running on a STM32F103. In a
new project, we selecte a &amp;quot;smaller&amp;quot; type the STM32F105 with less
pins. 

 
In the bootloader we set a push pull port high. On the new
controller this port is not existing</description><dc:language>en-US</dc:language><generator>Telligent Community 10</generator><item><title>RE: writing to a port which is not available</title><link>https://community.arm.com/thread/63451?ContentTypeID=1</link><pubDate>Tue, 03 Feb 2015 14:10:35 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:94450ca6-3397-425b-8aed-34c8b2f89fe3</guid><dc:creator>HansBernhard Broeker</dc:creator><description>&lt;p&gt;&lt;p&gt;
&lt;i&gt;Will it cause any problems writing to a port which is not
available on the new STM32F105 type?&lt;/i&gt;&lt;/p&gt;

&lt;p&gt;
That&amp;#39;s a question to be addressed elsewhere, because it really has
nothing to do with Keil or any of their products. This is something
to be looked up in the &lt;b&gt;datasheet,&lt;/b&gt; for your device, and if
that&amp;#39;s not sufficiently clear, by asking its manufacturer.&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: writing to a port which is not available</title><link>https://community.arm.com/thread/63450?ContentTypeID=1</link><pubDate>Tue, 03 Feb 2015 10:10:53 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:7070be93-a609-40c4-860e-103401ded069</guid><dc:creator>Westonsupermare Pier</dc:creator><description>&lt;p&gt;&lt;p&gt;
Lower pin count devices usually use exactly the same die, but just
bond out less pins.&lt;/p&gt;

&lt;p&gt;
As long as you have no dependency on the pins from external
signals, you&amp;#39;re usually safe to assume they are NC (No connects), but
these are things which you are responsible to validate, and questions
would be better asked of an FAE of the vendor, than random
respondents on an unrelated forum.&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item></channel></rss>