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<div id="projectname">CMSIS-SVD
 <span id="projectnumber">Version 1.10</span>
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<div id="projectbrief">CMSIS System View Description</div>
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<div class="title">Peripherals Level<div class="ingroups"><a class="el" href="group__svd___format__gr.html">SVD File Schema Levels</a></div></div> </div>
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<p>All peripherals of a device are enclosed within the tag <b><peripherals></b>. At least one peripheral has to be defined. Each peripheral is enclosed in the tag <b><peripheral></b>.</p>
<ul>
<li>Each peripheral describes all registers belonging to that peripheral.</li>
<li>The address range allocated by a peripheral is defined through one or more address blocks.</li>
<li>An address block and register addresses are specified relative to the base address of a peripheral. The address block information can be used for constructing a memory map for the device peripherals.</li>
</ul>
<dl class="section remark"><dt>Remarks</dt><dd>The memory map does not contain any information about RAM, ROM, or FLASH memory.</dd></dl>
<hr/>
<pre>
<span class="mand"> <b><peripherals></b> </span></pre><pre><span class="mand"> <b><peripheral <span class="opt">derivedFrom=<em>identifierType</em></span>></b></span></pre><pre><span class="mand"> <name><em>identifierType</em></name>
<version><em>xs:string</em></version>
<description><em>xs:string</em></description>
<span class="opt">
<groupName><em>identifierType</em></groupName>
<prependToName><em>identifierType</em></prependToName>
<appendToName><em>identifierType</em></appendToName>
<disableCondition><em>xs:string</em></disableCondition>
</span>
<baseAddress><em>scaledNonNegativeInteger</em></baseAddress>
<span class="opt">
<em> <!-- registerPropertiesGroup --></em>
<size><em>scaledNonNegativeInteger</em></size>
<access><em>accessType</em></access>
<resetValue><em>scaledNonNegativeInteger</em></resetValue>
<resetMask><em>scaledNonNegativeInteger</em></resetMask>
<em> <!-- end of registerPropertiesGroup --></em>
</span>
<addressBlock>
<offset><em>scaledNonNegativeInteger</em></offset>
<size><em>scaledNonNegativeInteger</em></size>
<usage><em>usageType</em></usage>
</addressBlock><span class="opt">
...
<addressBlock><span class="mand">
<offset><em>scaledNonNegativeInteger</em></offset>
<size><em>scaledNonNegativeInteger</em></size>
<usage><em>usageType</em></usage></span><span class="opt">
</addressBlock></span>
<span class="opt">
<interrupt></span><span class="mand">
<name><em>identifierType</em></name>
<value><em>scaledNonNegativeInteger</em></value></span>
</interrupt></span></span></pre><pre><span class="mand"><span class="opt"> <registers>
...
</registers></span></span></pre><pre><span class="mand"> <b></peripheral></b>
<span class="opt">...
<peripheral>
...
</peripheral>
</span>
<b></peripherals></b>
</span>
</pre><table class="cmtable" summary="Peripheral Level Schema">
<tr>
<th nowrap="nowrap">Attribute Name </th><th>Description </th><th>Type </th><th>Occurrence </th></tr>
<tr>
<td>derivedFrom </td><td>Specifies the name of a peripheral from which this peripheral will be derived. Values are inherit. Elements specified underneath will override inherited values. </td><td>xs:Name </td><td>0..1 </td></tr>
<tr>
<th nowrap="nowrap">Element Name </th><th>Description </th><th>Type </th><th>Occurrence </th></tr>
<tr>
<td>name </td><td>The name string is used to identify the peripheral. Peripheral names are required to be unique for a device. The name needs to be an ANSI C identifier to allow header file generation. </td><td>xs:Name </td><td>1..1 </td></tr>
<tr>
<td>version </td><td>The string specifies the version of this peripheral description. </td><td>xs:string </td><td>0..1 </td></tr>
<tr>
<td>description </td><td>The string provides an overview of the purpose and functionality of the peripheral. </td><td>xs:string </td><td>0..1 </td></tr>
<tr>
<td>groupName </td><td></td><td>xs:string </td><td>0..1 </td></tr>
<tr>
<td>prependToName </td><td>All register names of this peripheral have their names prefixed with this string. </td><td>xs:string </td><td>0..1 </td></tr>
<tr>
<td>appendToName </td><td>All register names of this peripheral have their names suffixed with this string. </td><td>xs:string </td><td>0..1 </td></tr>
<tr>
<td>disableCondition </td><td>Is a C-language compliant logical expression returning a TRUE or FALSE result. If TRUE, refreshing the display for this peripheral is disabled and related accesses by the debugger are suppressed. <br/>
<br/>
Only constants and references to other registers contained in the description are allowed: <em><peripheral>-><register>-><field></em>, for example, (System->ClockControl->apbEnable == 0). The following operators are allowed in the expression [&&,||, ==, !=, >>, <<, &, |]. <dl class="section attention"><dt>Attention</dt><dd>Use this feature only in cases where accesses from the debugger to registers of un-clocked peripherals result in severe debugging failures. SVD is intended to provide static information and does not include any run-time computation or functions. Such capabilities can be added by the tools, and is beyond the scope of this description language. </dd></dl>
</td><td>xs:string </td><td>0..1 </td></tr>
<tr>
<td>baseAddress </td><td>Lowest address reserved or used by the peripheral. </td><td>scaledNonNegativeInteger </td><td>1..1 </td></tr>
<tr class="group1">
<td colspan="4">See <a class="el" href="group__register_properties_group__gr.html">registerPropertiesGroup</a> for details. </td></tr>
<tr class="group1">
<td align="right">size </td><td>Defines the default bit-width of any register contained in the device (implicit inheritance). </td><td>scaledNonNegativeInteger </td><td>0..1 </td></tr>
<tr class="group1">
<td align="right">access </td><td>Defines the default access rights for all registers. </td><td>accessType </td><td>0..1 </td></tr>
<tr class="group1">
<td align="right">resetValue </td><td>Defines the default value for all registers at RESET. </td><td>scaledNonNegativeInteger </td><td>0..1 </td></tr>
<tr class="group1">
<td align="right">resetMask </td><td>Identifies which register bits have a defined reset value. </td><td>scaledNonNegativeInteger </td><td>0..1 </td></tr>
<tr class="group2">
<td>addressBlock </td><td>Specifies an address range uniquely mapped to this peripheral. A peripheral must have at least one address block, but may allocate multiple distinct address ranges. If a peripheral is derived form another peripheral, the addressBlock is not mandatory. </td><td>addressBlockType </td><td>1..* </td></tr>
<tr class="group2">
<td align="right">offset </td><td>Specifies the start address of an address block relative to the peripheral <em>baseAddress</em>. </td><td>scaledNonNegativeInteger </td><td>1..1 </td></tr>
<tr class="group2">
<td align="right">size </td><td>Specifies the number of addressUnitBits being covered by this address block. The end address of an address block results from the sum of baseAddress, offset, and (size - 1). </td><td>scaledNonNegativeInteger </td><td>1..1 </td></tr>
<tr class="group2">
<td align="right">usage </td><td>The following predefined values can be used: <span class="XML-Token">registers<em>, </em> buffer<em>, or</em> reserved</span>. </td><td>scaledNonNegativeInteger </td><td>1..1 </td></tr>
<tr class="group1">
<td>interrupt </td><td>A peripheral can have multiple associated interrupts. This entry allows the debugger to show interrupt names instead of interrupt numbers. </td><td>interruptType </td><td>0..* </td></tr>
<tr class="group1">
<td align="right">name </td><td>The string represents the interrupt name. </td><td>XS:string </td><td>1..1 </td></tr>
<tr class="group1">
<td align="right">value </td><td>Is the enumeration index value associated to the interrupt. </td><td>xs:integer </td><td>1..1 </td></tr>
<tr>
<td>registers </td><td>See <a class="el" href="group__svd__xml__registers__gr.html">Registers Level</a> for details. </td><td>  </td><td>0..1 </td></tr>
</table>
<h1><a class="anchor" id="periph_ex"></a>
Example:</h1>
<div class="fragment"><div class="line">...</div>
<div class="line"><peripheral></div>
<div class="line"> <name>Timer0</name></div>
<div class="line"> <version>1.0.32</version></div>
<div class="line"> <description>Timer 0 is a simple 16 bit timer counting down ... </description></div>
<div class="line"> <baseAddress>0x40000000</baseAddress></div>
<div class="line"> <addressBlock></div>
<div class="line"> <offset>0x0</offset></div>
<div class="line"> <size>0x400</size></div>
<div class="line"> <usage>registers</usage></div>
<div class="line"> </addressBlock></div>
<div class="line"> <interrupt><name>TIM0_INT</name><value>34</value></interrupt></div>
<div class="line"> <registers></div>
<div class="line"> ...</div>
<div class="line"> </registers></div>
<div class="line"></peripheral></div>
<div class="line"></div>
<div class="line"><peripheral derivedFrom=<span class="stringliteral">"Timer0"</span>></div>
<div class="line"> <name>Timer1</name></div>
<div class="line"> <baseAddress>0x40000400</baseAddress></div>
<div class="line"></peripheral></div>
<div class="line">...</div>
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