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<title>Extensions to the Peripheral Section</title>
<title>CMSIS-SVD: Extensions to the Peripheral Section</title>
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<div id="projectname">CMSIS-SVD
 <span id="projectnumber">Version 1.3.1</span>
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<div id="projectbrief">CMSIS System View Description</div>
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<div class="title">Extensions to the Peripheral Section</div> </div>
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<p>The following elements have been added to the peripheral section. All new elements are optional but are highly recommended to enable the generation of consistent and CMSIS-compliant device header files from SVD descriptions.</p>
<table class="cmtable" summary="Peripheral Section Extension Elements">
<tr>
<th nowrap="nowrap">Element Name </th><th>Description </th><th>Type </th><th>Occurrence </th></tr>
<tr>
<td>alternatePeripheral </td><td>All address blocks in the memory space of a device are assigned to a unique peripheral by default. If there are multiple peripherals describing the same address blocks, this needs to be specified explicitly. A peripheral redefining an address block needs to specify the name of the peripheral that is listed first in the description. If no alternate peripheral is specified, then the <em>SVDConv</em> utility will generate errors. </td><td>identifierType </td><td>0..1 </td></tr>
<tr>
<td>headerStructName </td><td>The header file generator uses the name of a peripheral as the base name for the C structure type. If this element is specfied, then this string is used instead of the peripheral name. This is particularly useful when multiple peripherals get derived from a peripheral description and a generic type name shall be used. </td><td>identifierType </td><td>0..1 </td></tr>
</table>
<h1><a class="anchor" id="periperalSectionExtensions_ex"></a>
Example:</h1>
<div class="fragment"><div class="line"><peripheral></div>
<div class="line"> <name>Timer1</name></div>
<div class="line"> <version>1.0</version></div>
<div class="line"> <description>Timer 1 is a standard timer ... </description></div>
<div class="line"> <baseAddress>0x40002000</baseAddress></div>
<div class="line"> ...</div>
<div class="line"></peripheral></div>
<div class="line"><peripheral></div>
<div class="line"> <name>Timer1_Alt</name></div>
<div class="line"> <version>1.0</version></div>
<div class="line"> <description>Alternate Timer 1 is a special timer execution mode ... </description></div>
<div class="line"> <baseAddress>0x40002000</baseAddress></div>
<div class="line"> <alternatePeripheral>Timer1</alternatePeripheral></div>
<div class="line"> ...</div>
<div class="line"></peripheral></div>
</div><!-- fragment --><p>Two timer peripheral descriptions are specified for the same memory block. No redefined addresses will be reported for both peripherals. </p>
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