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<title>CMSIS-Core (Cortex-M): Overview</title>
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 <span id="projectnumber">Version 5.3.0</span>
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<div id="projectbrief">CMSIS-Core support for Cortex-M processor-based devices</div>
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<div class="title">Overview </div> </div>
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<div class="textblock"><p>CMSIS-Core (Cortex-M) implements the basic run-time system for a Cortex-M device and gives the user access to the processor core and the device peripherals. In detail it defines:</p>
<ul>
<li><b>Hardware Abstraction Layer (HAL)</b> for Cortex-M processor registers with standardized definitions for the SysTick, NVIC, System Control Block registers, MPU registers, FPU registers, and core access functions.</li>
<li><b>System exception names</b> to interface to system exceptions without having compatibility issues.</li>
<li><b>Methods to organize header files</b> that makes it easy to learn new Cortex-M microcontroller products and improve software portability. This includes naming conventions for device-specific interrupts.</li>
<li><b>Methods for system initialization</b> to be used by each MCU vendor. For example, the standardized <a class="el" href="group__system__init__gr.html#ga93f514700ccf00d08dbdcff7f1224eb2" title="Function to Initialize the system. ">SystemInit()</a> function is essential for configuring the clock system of the device.</li>
<li><b>Intrinsic functions</b> used to generate CPU instructions that are not supported by standard C functions.</li>
<li>A variable to determine the <b>system clock frequency</b> which simplifies the setup the SysTick timer.</li>
</ul>
<p>The following sections provide details about the CMSIS-Core (Cortex-M):</p>
<ul>
<li><a class="el" href="using_pg.html">Using CMSIS in Embedded Applications</a> describes the project setup and shows a simple program example.</li>
<li><a class="el" href="using_TrustZone_pg.html">Using TrustZone® for Armv8-M</a> describes how to use the security extensions available in the Armv8-M architecture.</li>
<li><a class="el" href="templates_pg.html">CMSIS-Core Device Templates</a> describes the files of the CMSIS-Core (Cortex-M) in detail and explains how to adapt template files provided by Arm to silicon vendor devices.</li>
<li><a class="el" href="coreMISRA_Exceptions_pg.html">MISRA-C Deviations</a> describes the violations to the MISRA standard.</li>
<li><a href="Modules.html"><b>Reference</b> </a> describe the features and functions of the <a class="el" href="device_h_pg.html">Device Header File <device.h></a> in detail.</li>
<li><a href="Annotated.html"><b>Data</b> <b>Structures</b> </a> describe the data structures of the <a class="el" href="device_h_pg.html">Device Header File <device.h></a> in detail.</li>
</ul>
<hr/>
<h2>CMSIS-Core (Cortex-M) in ARM::CMSIS Pack </h2>
<p>Files relevant to CMSIS-Core (Cortex-M) are present in the following <b>ARM::CMSIS</b> directories: </p>
<table class="doxtable">
<tr>
<th>File/Folder </th><th>Content </th></tr>
<tr>
<td><b>CMSIS\Documentation\Core</b> </td><td>This documentation </td></tr>
<tr>
<td><b>CMSIS\Core\Include</b> </td><td>CMSIS-Core (Cortex-M) header files (for example core_cm3.h, core_cmInstr.h, etc.) </td></tr>
<tr>
<td><b>Device</b> </td><td><a class="el" href="using_ARM_pg.html">Arm reference implementations</a> of Cortex-M devices </td></tr>
<tr>
<td><b>Device\_Template_Vendor</b> </td><td><a class="el" href="templates_pg.html">CMSIS-Core Device Templates</a> for extension by silicon vendors </td></tr>
</table>
<hr/>
<h1><a class="anchor" id="ref_v6-v8M"></a>
Processor Support</h1>
<p>CMSIS supports the complete range of <a href="https://developer.arm.com/products/processors/cortex-m" target="_blank"><b>Cortex-M processors</b></a> and the <a href="http://www.arm.com/products/processors/instruction-set-architectures/armv8-m-architecture.php" target="_blank"><b>Armv8-M/v8.1-M architecture</b></a> including security extensions.</p>
<h2><a class="anchor" id="ref_man_sec"></a>
Cortex-M Reference Manuals</h2>
<p>The Cortex-M Device Generic User Guides contain the programmers model and detailed information about the core peripherals and are available for:</p>
<ul>
<li><a href="http://infocenter.arm.com/help/topic/com.arm.doc.dui0497a/DUI0497A_cortex_m0_r0p0_generic_ug.pdf" target="_blank"><b>Cortex-M0 Devices Generic User Guide</b></a> (Armv6-M architecture)</li>
<li><a href="http://infocenter.arm.com/help/topic/com.arm.doc.dui0662b/DUI0662B_cortex_m0p_r0p1_dgug.pdf" target="_blank"><b>Cortex-M0+ Devices Generic User Guide</b></a> (Armv6-M architecture)</li>
<li><a href="http://infocenter.arm.com/help/topic/com.arm.doc.dui0552a/DUI0552A_cortex_m3_dgug.pdf" target="_blank"><b>Cortex-M3 Devices Generic User Guide</b></a> (Armv7-M architecture)</li>
<li><a href="http://infocenter.arm.com/help/topic/com.arm.doc.dui0553a/DUI0553A_cortex_m4_dgug.pdf" target="_blank"><b>Cortex-M4 Devices Generic User Guide</b></a> (ARMv7-M architecture)</li>
<li><a href="http://infocenter.arm.com/help/topic/com.arm.doc.dui0646a/DUI0646A_cortex_m7_dgug.pdf" target="_blank"><b>Cortex-M7 Devices Generic User Guide</b></a> (Armv7-M architecture)</li>
</ul>
<p>The <b>Cortex-M23</b> and <b>Cortex-M33</b> are described with Technical Reference Manuals that are available here:</p>
<ul>
<li><a href="http://infocenter.arm.com/help/topic/com.arm.doc.ddi0550c/cortex_m23_r1p0_technical_reference_manual_DDI0550C_en.pdf" target="_blank"><b>Cortex-M23 Technical Reference Manual</b></a> (Armv8-M baseline architecture)</li>
<li><a href="http://infocenter.arm.com/help/topic/com.arm.doc.100230_0002_00_en/cortex_m33_trm_100230_0002_00_en.pdf" target="_blank"><b>Cortex-M33 Technical Reference Manual</b></a> (Armv8-M mainline architecture)</li>
</ul>
<p>CMSIS also supports the following Cortex-M processor variants:</p>
<ul>
<li><a href="https://developer.arm.com/products/processors/cortex-m/cortex-m1" target="_blank"><b>Cortex-M1</b></a> is a processor designed specifically for implementation in FPGAs (Armv6-M architecture).</li>
<li><a href="https://developer.arm.com/products/processors/cortex-m/sc000-processor" target="_blank"><b>SecurCore SC000</b></a> is designed specifically for smartcard and security applications (Armv6-M architecture).</li>
<li><a href="https://developer.arm.com/products/processors/cortex-m/sc300-processor" target="_blank"><b>SecurCore SC300</b></a> is designed specifically for smartcard and security applications (Armv7-M architecture).</li>
<li><a href="https://developer.arm.com/products/processors/cortex-m/sc300-processor" target="_blank"><b>Cortex-M35P</b></a> is a temper resistant Cortex-M processor with optional software isolation using TrustZone for Armv8-M.</li>
</ul>
<h2><a class="anchor" id="ARMv8M"></a>
Armv8-M and Armv8.1-M Architecture</h2>
<p>Armv8-M introduces two profiles <b>baseline</b> (for power and area constrained applications) and <b>mainline</b> (full-featured with optional SIMD, floating-point, and co-processor extensions). Both Armv8-M profiles and Armv8.1M are supported by CMSIS.</p>
<p>The Armv8-M Architecture is described in the <a href="http://developer.arm.com/products/architecture/m-profile/docs/ddi0553/latest/armv8-m-architecture-reference-manual" target="_blank"><b>Armv8-M Architecture Reference Manual</b></a>.</p>
<p>The Armv8.1-M Architecture further extends Armv8-M with Helium, an Microcontroller Vector Extension (MVE) and further instruction set and debug extensions. More information about Armv8.1-M Architecture is available under <a href="https://developer.arm.com/technologies/helium" target="_blank"><b>Arm Helium technology</b></a>.</p>
<hr/>
<h1><a class="anchor" id="tested_tools_sec"></a>
Tested and Verified Toolchains</h1>
<p>The <a class="el" href="templates_pg.html">CMSIS-Core Device Templates</a> supplied by Arm have been tested and verified with the following toolchains:</p>
<ul>
<li>Arm: Arm Compiler 5.06 update 6 (not for Cortex-M23/33/35P, Armv8-M, Armv8.1-M)</li>
<li>Arm: Arm Compiler 6.12</li>
<li>Arm: Arm Compiler 6.6.2 (not for Cortex-M0/23/33/35P, Armv8-M, Armv8.1-M)</li>
<li>GNU: GNU Tools for Arm Embedded 8.2.1 2018q4</li>
<li>IAR: IAR ANSI C/C++ Compiler for Arm 8.20.1.14183</li>
</ul>
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