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The ARM Cortex-M is a group of
32-bit In computer architecture, 32-bit computing refers to computer systems with a processor, memory, and other major system components that operate on data in 32-bit units. Compared to smaller bit widths, 32-bit computers can perform large calculati ...
RISC
ARM In human anatomy, the arm refers to the upper limb in common usage, although academically the term specifically means the upper arm between the glenohumeral joint (shoulder joint) and the elbow joint. The distal part of the upper limb between th ...
processor cores licensed by
Arm Holdings Arm is a British semiconductor and software design company based in Cambridge, England. Its primary business is in the design of ARM processors (CPUs). It also designs other chips, provides software development tools under the DS-5, RealView ...
. These cores are optimized for low-cost and energy-efficient integrated circuits, which have been embedded in tens of billions of consumer devices. Though they are most often the main component of microcontroller chips, sometimes they are embedded inside other types of chips too. The Cortex-M family consists of Cortex-M0, Cortex-M0+, Cortex-M1, Cortex-M3, Cortex-M4, Cortex-M7, Cortex-M23, Cortex-M33, Cortex-M35P, Cortex-M55. The Cortex-M4 / M7 / M33 / M35P / M55 cores have an
FPU FPU may stand for: Universities * Florida Polytechnic University, in Lakeland, Florida, United States * Franklin Pierce University, in New Hampshire, United States * Fresno Pacific University, in California, United States * Fukui Prefectural Un ...
silicon option, and when included in the silicon these cores are sometimes known as "Cortex-Mx with FPU" or "Cortex-MxF", where 'x' is the core variant.


Overview

The ARM Cortex-M family are ARM microprocessor cores which are designed for use in microcontrollers,
ASIC An application-specific integrated circuit (ASIC ) is an integrated circuit (IC) chip customized for a particular use, rather than intended for general-purpose use, such as a chip designed to run in a digital voice recorder or a high-efficien ...
s, ASSPs, FPGAs, and SoCs. Cortex-M cores are commonly used as dedicated microcontroller chips, but also are "hidden" inside of SoC chips as power management controllers, I/O controllers, system controllers, touch screen controllers, smart battery controllers, and sensors controllers. The main difference from the
Cortex-A The ARM Cortex-A is a group of 32-bit and 64-bit RISC ARM processor cores licensed by Arm Holdings. The cores are intended for application use. The group consists of 32-bit only cores: ARM Cortex-A5, ARM Cortex-A7, ARM Cortex-A8, ARM Cortex-A9, ...
core is that there is no
memory management unit A memory management unit (MMU), sometimes called paged memory management unit (PMMU), is a computer hardware unit having all memory references passed through itself, primarily performing the translation of virtual memory addresses to physical a ...
(MMU). A full-fledged operating system does not normally run on this class of processor. Though 8-bit microcontrollers were very popular in the past, Cortex-M has slowly been chipping away at the 8-bit market as the prices of low-end Cortex-M chips have moved downward. Cortex-M have become a popular replacements for 8-bit chips in applications that benefit from 32-bit math operations, and replacing older legacy ARM cores such as
ARM7 ARM7 is a group of 32-bit RISC ARM processor cores licensed by ARM Holdings for microcontroller use. The ARM7 core family consists of ARM700, ARM710, ARM7DI, ARM710a, ARM720T, ARM740T, ARM710T, ARM7TDMI, ARM7TDMI-S, ARM7EJ-S. The ARM7TDMI an ...
and
ARM9 ARM9 is a group of 32-bit RISC ARM processor cores licensed by ARM Holdings for microcontroller use. The ARM9 core family consists of ARM9TDMI, ARM940T, ARM9E-S, ARM966E-S, ARM920T, ARM922T, ARM946E-S, ARM9EJ-S, ARM926EJ-S, ARM968E-S, ARM996 ...
.


License

Arm Holdings Arm is a British semiconductor and software design company based in Cambridge, England. Its primary business is in the design of ARM processors (CPUs). It also designs other chips, provides software development tools under the DS-5, RealView ...
neither manufactures nor sells CPU devices based on its own designs, but rather licenses the processor architecture to interested parties. Arm offers a variety of licensing terms, varying in cost and deliverables. To all licensees, Arm provides an integratable hardware description of the ARM core, as well as complete software development toolset and the right to sell manufactured silicon containing the ARM CPU.


Silicon customization

Integrated Device Manufacturers (IDM) receive the ARM Processor IP as synthesizable RTL (written in Verilog). In this form, they have the ability to perform architectural level optimizations and extensions. This allows the manufacturer to achieve custom design goals, such as higher clock speed, very low power consumption, instruction set extensions (including floating point), optimizations for size, debug support, etc. To determine which components have been included in a particular ARM CPU chip, consult the manufacturer datasheet and related documentation. Some of the silicon options for the Cortex-M cores are: * SysTick timer: A 24-bit system timer that extends the functionality of both the processor and the Nested Vectored Interrupt Controller (NVIC). When present, it also provides an additional configurable priority SysTick interrupt. Though the SysTick timer is optional, it is very rare to find a Cortex-M microcontroller without it. If a Cortex-M33 microcontroller has the Security Extension option, then it has two SysTicks, one Secure and one Non-secure. * Bit-Band: Maps a complete word of memory onto a single bit in the bit-band region. For example, writing to an alias word will set or clear the corresponding bit in the bit-band region. This allows every individual bit in the bit-band region to be directly accessible from a word-aligned address. In particular, individual bits can be set, cleared, or toggled from C/C++ without performing a read-modify-write sequence of instructions. Though the bit-band is optional, it is less common to find a Cortex-M3 and Cortex-M4 microcontroller without it. Some Cortex-M0 and Cortex-M0+ microcontrollers have bit-band. * Memory Protection Unit (MPU): Provides support for protecting regions of memory through enforcing privilege and access rules. It supports up to eight different regions, each of which can be split into a further eight equal-size sub-regions. * Tightly-Coupled Memory (TCM): Low-latency RAM that is used to hold critical routines, data, stacks. Other than cache, it is typically the fastest RAM in the microcontroller. * Note: Most Cortex-M3 and M4 chips have bit-band and MPU. The bit-band option can be added to the M0/M0+ using the Cortex-M System Design Kit.Cortex-M System Design Kit; Arm Holdings.
/ref> * Note: Software should validate the existence of a feature before attempting to use it.Cortex-M3 Embedded Software Development; App Note 179; Arm Holdings.
/ref> * Note: Limited public information is available for the Cortex-M35P until its ''Technical Reference Manual'' is released. Additional silicon options: * Data endianness: Little-endian or big-endian. Unlike legacy ARM cores, the Cortex-M is permanently fixed in silicon as one of these choices. * Interrupts: 1 to 32 (M0/M0+/M1), 1 to 240 (M3/M4/M7/M23), 1 to 480 (M33/M35P). * Wake-up interrupt controller: Optional. * Vector Table Offset Register: Optional. (not available for M0). * Instruction fetch width: 16-bit only, or mostly 32-bit. * User/privilege support: Optional. * Reset all registers: Optional. * Single-cycle I/O port: Optional. (M0+/M23). * Debug Access Port (DAP): None, SWD, JTAG and SWD. (optional for all Cortex-M cores) * Halting debug support: Optional. * Number of watchpoint comparators: 0 to 2 (M0/M0+/M1), 0 to 4 (M3/M4/M7/M23/M33/M35P). * Number of breakpoint comparators: 0 to 4 (M0/M0+/M1/M23), 0 to 8 (M3/M4/M7/M33/M35P).


Instruction sets

The Cortex-M0 / M0+ / M1 implement the ARMv6-M architecture, the Cortex-M3 implements the ARMv7-M architecture, the Cortex-M4 / Cortex-M7 implements the ARMv7E-M architecture, the Cortex-M23 / M33 / M35P implement the ARMv8-M architecture, and the Cortex-M55 implements the ARMv8.1-M architecture. The architectures are binary instruction upward compatible from ARMv6-M to ARMv7-M to ARMv7E-M. Binary instructions available for the Cortex-M0 / Cortex-M0+ / Cortex-M1 can execute without modification on the Cortex-M3 / Cortex-M4 / Cortex-M7. Binary instructions available for the Cortex-M3 can execute without modification on the Cortex-M4 / Cortex-M7 / Cortex-M33 / Cortex-M35P. Only Thumb-1 and Thumb-2 instruction sets are supported in Cortex-M architectures; the legacy 32-bit ARM instruction set isn't supported. All Cortex-M cores implement a common subset of instructions that consists of most Thumb-1, some Thumb-2, including a 32-bit result multiply. The Cortex-M0 / Cortex-M0+ / Cortex-M1 / Cortex-M23 were designed to create the smallest silicon die, thus having the fewest instructions of the Cortex-M family. The Cortex-M0 / M0+ / M1 include Thumb-1 instructions, except new instructions (CBZ, CBNZ, IT) which were added in ARMv7-M architecture. The Cortex-M0 / M0+ / M1 include a minor subset of Thumb-2 instructions (BL, DMB, DSB, ISB, MRS, MSR). The Cortex-M3 / M4 / M7 / M33 / M35P have all base Thumb-1 and Thumb-2 instructions. The Cortex-M3 adds three Thumb-1 instructions, all Thumb-2 instructions, hardware integer divide, and saturation arithmetic instructions. The Cortex-M4 adds DSP instructions and an optional single-precision
floating-point unit In computing, floating-point arithmetic (FP) is arithmetic that represents real numbers approximately, using an integer with a fixed precision, called the significand, scaled by an integer exponent of a fixed base. For example, 12.345 can be ...
(VFPv4-SP). The Cortex-M7 adds an optional double-precision FPU (VFPv5). The Cortex-M23 / M33 add
TrustZone ARM (stylised in lowercase as arm, formerly an acronym for Advanced RISC Machines and originally Acorn RISC Machine) is a family of reduced instruction set computer (RISC) instruction set architectures for computer processors, configured ...
instructions. * Note: The Cortex-M0 / M0+ / M1 doesn't include these 16-bit Thumb-1 instructions: CBZ, CBNZ, IT. * Note: The Cortex-M0 / M0+ / M1 only include these 32-bit Thumb-2 instructions: BL, DMB, DSB, ISB, MRS, MSR. * Note: The Cortex-M0 / M0+ / M1 / M23 only has 32-bit multiply instructions with a lower-32-bit result (32bit × 32bit = lower 32bit), where as the Cortex-M3 / M4 / M7 / M33 / M35P includes additional 32-bit multiply instructions with 64-bit results (32bit × 32bit = 64bit). The Cortex-M4 / M7 (optionally M33 / M35P) include DSP instructions for (16bit × 16bit = 32bit), (32bit × 16bit = upper 32bit), (32bit × 32bit = upper 32bit) multiplications. * Note: The number of cycles to complete multiply and divide instructions vary across ARM Cortex-M core designs. Some cores have a silicon option for the choice of fast speed or small size (slow speed), so cores have the option of using less silicon with the downside of higher cycle count. An interrupt occurring during the execution of a divide instruction or slow-iterative multiply instruction will cause the processor to abandon the instruction, then restart it after the interrupt returns. ** Multiply instructions "32-bit result" Cortex-M0/M0+/M23 is 1 or 32 cycle silicon option, Cortex-M1 is 3 or 33 cycle silicon option, Cortex-M3/M4/M7/M33/M35P is 1 cycle. ** Multiply instructions "64-bit result" Cortex-M3 is 3–5 cycles (depending on values), Cortex-M4/M7/M33/M35P is 1 cycle. ** Divide instructions Cortex-M3/M4 is 2–12 cycles (depending on values), Cortex-M7 is 3–20 cycles (depending on values), Cortex-M23 is 17 or 34 cycle option, Cortex-M33 is 2–11 cycles (depending on values), Cortex-M35P is TBD. * Note: The Cortex-M4 / M7 / M33 / M35P has a silicon option choice of no FPU or
single-precision Single-precision floating-point format (sometimes called FP32 or float32) is a computer number format, usually occupying 32 bits in computer memory; it represents a wide dynamic range of numeric values by using a floating radix point. A floating- ...
(SP) FPU, and the Cortex-M7 adds a third silicon option of supporting both single-precision (SP) and
double-precision Double-precision floating-point format (sometimes called FP64 or float64) is a floating-point number format, usually occupying 64 bits in computer memory; it represents a wide dynamic range of numeric values by using a floating radix point. Flo ...
(DP). If the Cortex-M4 / M7 / M33 / M35P has a FPU, then it is known as the Cortex-M4F / Cortex-M7F / Cortex-M33F / Cortex-M35PF. * Note: The Cortex-M series includes three new 16-bit Thumb-1 instructions for sleep mode: SEV, WFE, WFI. * Note: Interrupt latency cycle count assumes: 1) stack located in zero-wait state RAM, 2) another interrupt function not currently executing, 3) Security Extension option doesn't exist, because it adds additional cycles. The Cortex-M cores with a Harvard computer architecture have a shorter interrupt latency than Cortex-M cores with a Von Neumann computer architecture. * Note: MOVW is an alias that means 32-bit "wide" MOV instruction. * Note: For Cortex-M1, WFE / WFI / SEV instructions exist, but execute as a NOP instruction. * Note: The single-precision (SP) FPU instructions are valid in the Cortex-M4 / M7 / M33 / M35P only when the SP FPU option exists in the silicon. * Note: The double-precision (DP) FPU instructions are valid in the Cortex-M7 only when the DP FPU option exists in the silicon.


Deprecations

The ARM architecture for ARM Cortex-M series removed some features from older legacy cores: * The 32-bit ARM instruction set is not included in Cortex-M cores. * Endianness is chosen at silicon implementation in Cortex-M cores. Legacy cores allowed "on-the-fly" changing of the data endian mode. *
Co-processor A coprocessor is a computer processor used to supplement the functions of the primary processor (the CPU). Operations performed by the coprocessor may be floating-point arithmetic, graphics, signal processing, string processing, cryptography or ...
were not supported on Cortex-M cores, until the silicon option was reintroduced in "ARMv8-M Mainline" for ARM Cortex-M33/M35P cores. The capabilities of the 32-bit ARM instruction set is duplicated in many ways by the Thumb-1 and Thumb-2 instruction sets, but some ARM features don't have a similar feature: * The SWP and SWPB (swap) ARM instructions don't have a similar feature in Cortex-M. The 16-bit Thumb-1 instruction set has evolved over time since it was first released in the legacy ARM7T cores with the ARMv4T architecture. New Thumb-1 instructions were added as each legacy ARMv5 / ARMv6 / ARMv6T2 architectures were released. Some 16-bit Thumb-1 instructions were removed from the Cortex-M cores: * The "BLX " instruction doesn't exist because it was used to switch from Thumb-1 to ARM instruction set. The "BLX " instruction is still available in the Cortex-M. * SETEND doesn't exist because on-the-fly switching of data endian mode is no longer supported. * Co-processor instructions were not supported on Cortex-M cores, until the silicon option was reintroduced in "ARMv8-M Mainline" for ARM Cortex-M33/M35P cores. * The SWI instruction was renamed to SVC, though the instruction binary coding is the same. However, the SVC handler code is different from the SWI handler code, because of changes to the exception models.


Cortex-M0

The Cortex-M0 core is optimized for small silicon die size and use in the lowest price chips. Key features of the Cortex-M0 core are:Cortex-M0 Technical Reference Manual Revision r0p0; Arm Holdings.
/ref> * ARMv6-M architecture * 3-stage pipeline * Instruction sets: ** Thumb-1 (most), missing CBZ, CBNZ, IT ** Thumb-2 (some), only BL, DMB, DSB, ISB, MRS, MSR ** 32-bit hardware integer multiply with 32-bit result * 1 to 32 interrupts, plus NMI Silicon options: * Hardware integer multiply speed: 1 or 32 cycles.


Chips

The following microcontrollers are based on the Cortex-M0 core: * ABOV AC30M1x64 * Cypress PSoC 4000, 4100, 4100M, 4200, 4200DS, 4200L, 4200M *
Infineon Infineon Technologies AG is a German semiconductor manufacturer founded in 1999, when the semiconductor operations of the former parent company Siemens AG were spun off. Infineon has about 50,280 employees and is one of the ten largest semicon ...
XMC1100, XMC1200, XMC1300, XMC1400, TLE984x * Dialog DA1458x, DA1468x * Nordic
nRF51 The nRF51 Series SoCs are a family of ultra low-power wireless SoCs from Nordic Semiconductor. The nRF51 series are designed to enable a wide range of wireless embedded systems and consumer electronic products in many different fields of wireles ...
*
NXP NXP Semiconductors N.V. (NXP) is a Dutch semiconductor designer and manufacturer with headquarters in Eindhoven, Netherlands. The company employs approximately 31,000 people in more than 30 countries. NXP reported revenue of $11.06 billion in 2 ...
LPC1100 LPC is a family of 32-bit microcontroller integrated circuits by NXP Semiconductors (formerly Philips Semiconductors). The LPC chips are grouped into related series that are based around the same 32-bit ARM processor core, such as the Cortex-M4F ...
,
LPC1200 LPC is a family of 32-bit microcontroller integrated circuits by NXP Semiconductors (formerly Philips Semiconductors). The LPC chips are grouped into related series that are based around the same 32-bit ARM processor core, such as the Cortex- ...
*
Nuvoton Nuvoton Technology Corporation () is a Taiwan-based semiconductor company established in 2008. It spun off from Winbond Electronics Corp. as a wholly owned subsidiary. Overview Nuvoton's main product lines are microcontroller application IC, ...
NuMicro * Sonix SN32F700 * ST STM32 F0 * Toshiba TX00 * Vorago VA10800 (extreme temperature), VA10820 (radiation hardened) The following chips have a Cortex-M0 as a secondary core: *
NXP NXP Semiconductors N.V. (NXP) is a Dutch semiconductor designer and manufacturer with headquarters in Eindhoven, Netherlands. The company employs approximately 31,000 people in more than 30 countries. NXP reported revenue of $11.06 billion in 2 ...
LPC4300 (one Cortex-M4F + one Cortex-M0) * Texas Instruments SimpleLink Wireless MCUs CC1310 and CC2650 (one programmable Cortex-M3 + one Cortex-M0 network processor + one proprietary Sensor Controller Engine)


Cortex-M0+

The Cortex-M0+ is an optimized superset of the Cortex-M0. The Cortex-M0+ has complete instruction set compatibility with the Cortex-M0 thus allowing the use of the same compiler and debug tools. The Cortex-M0+ pipeline was reduced from 3 to 2 stages, which lowers the power usage. In addition to debug features in the existing Cortex-M0, a silicon option can be added to the Cortex-M0+ called the Micro Trace Buffer (MTB) which provides a simple instruction trace buffer. The Cortex-M0+ also received Cortex-M3 and Cortex-M4 features, which can be added as silicon options, such as the memory protection unit (MPU) and the vector table relocation. Key features of the Cortex-M0+ core are:Cortex-M0+ Technical Reference Manual Revision r0p1; Arm Holdings.
/ref> * ARMv6-M architecture * 2-stage pipeline (one fewer than Cortex-M0) * Instruction sets: (same as Cortex-M0) ** Thumb-1 (most), missing CBZ, CBNZ, IT ** Thumb-2 (some), only BL, DMB, DSB, ISB, MRS, MSR ** 32-bit hardware integer multiply with 32-bit result * 1 to 32 interrupts, plus NMI Silicon options: * Hardware integer multiply speed: 1 or 32 cycles * 8-region memory protection unit (MPU) (same as M3 and M4) * Vector table relocation (same as M3, M4) * Single-cycle I/O port (available in M0+/M23) * Micro Trace Buffer (MTB) (available in M0+/M23/M33/M35P)


Chips

The following microcontrollers are based on the Cortex-M0+ core: * ABOV Semiconductor A31G11x, A31G12x, A31G314 * Cypress PSoC 4000S, 4100S, 4100S+, 4100PS, 4700S, FM0+ * Epson S1C31W74, S1C31D01, S1C31D50 *
Holtek Holtek Semiconductor () is a Taiwan-based semiconductor design centre and provider with its headquarters and design operations based in the Hsinchu Science Park in Taiwan, and has sales offices located in USA and India. Holtek's design focus is i ...
HT32F52000 * Microchip (Atmel)
SAM Sam, SAM or variants may refer to: Places * Sam, Benin * Sam, Boulkiemdé, Burkina Faso * Sam, Bourzanga, Burkina Faso * Sam, Kongoussi, Burkina Faso * Sam, Iran * Sam, Teton County, Idaho, United States, a populated place People and fictiona ...
C2, D0, D1, D2, DA, L2, R2, R3 *
NXP NXP Semiconductors N.V. (NXP) is a Dutch semiconductor designer and manufacturer with headquarters in Eindhoven, Netherlands. The company employs approximately 31,000 people in more than 30 countries. NXP reported revenue of $11.06 billion in 2 ...
LPC800 LPC is a family of 32-bit microcontroller integrated circuits by NXP Semiconductors (formerly Philips Semiconductors). The LPC chips are grouped into related series that are based around the same 32-bit ARM processor core, such as the Cortex-M4 ...
, LPC11E60, LPC11U60 *
NXP NXP Semiconductors N.V. (NXP) is a Dutch semiconductor designer and manufacturer with headquarters in Eindhoven, Netherlands. The company employs approximately 31,000 people in more than 30 countries. NXP reported revenue of $11.06 billion in 2 ...
( Freescale) Kinetis E, EA, L, M, V1, W0, S32K11x * Raspberry Pi
RP2040 The RP2040 is a 32-bit dual ARM Cortex-M0+ microcontroller integrated circuit by Raspberry Pi Ltd (was Raspberry Pi Trading Ltd). At the same time, it was released as part of the Raspberry Pi Pico board. Overview Announced on 21st January 202 ...
(two M0+ cores) * Renesas S124, S128, RE, RE01 * Silicon Labs ( Energy Micro) EFM32 Zero, Happy * ST STM32 L0, G0 The following chips have a Cortex-M0+ as a secondary core: * Cypress PSoC 6200 (one Cortex-M4F + one Cortex-M0+) * ST WB (one Cortex-M4F + one Cortex-M0+) The smallest ARM microcontrollers are of the Cortex-M0+ type (as of 2014, smallest at 1.6 mm by 2 mm in a
chip-scale package A chip scale package or chip-scale package (CSP) is a type of integrated circuit package. Originally, CSP was the acronym for ''chip-size packaging.'' Since only a few packages are chip size, the meaning of the acronym was adapted to ''chip-scal ...
is Kinetis KL03). On 21 June 2018, the " world's smallest computer'", or computer device was announced based on the ARM Cortex-M0+ (and including RAM and wireless transmitters and receivers based on
photovoltaics Photovoltaics (PV) is the conversion of light into electricity using semiconducting materials that exhibit the photovoltaic effect, a phenomenon studied in physics, photochemistry, and electrochemistry. The photovoltaic effect is commercially us ...
) by University of Michigan researchers at the 2018 Symposia on VLSI Technology and Circuits with the paper "A 0.04mm3 16nW Wireless and Batteryless Sensor System with Integrated Cortex-M0+ Processor and Optical Communication for Cellular Temperature Measurement." The device is 1/10th the size of IBM's previously claimed world-record-sized computer from months back in March 2018, which is smaller than a grain of salt.


Cortex-M1

The Cortex-M1 is an optimized core especially designed to be loaded into FPGA chips. Key features of the Cortex-M1 core are:Cortex-M1 r1p0 Technical Reference Manual; Arm Holdings.
/ref> * ARMv6-M architecture * 3-stage pipeline. * Instruction sets: ** Thumb-1 (most), missing CBZ, CBNZ, IT. ** Thumb-2 (some), only BL, DMB, DSB, ISB, MRS, MSR. ** 32-bit hardware integer multiply with 32-bit result. * 1 to 32 interrupts, plus NMI. Silicon options: * Hardware integer multiply speed: 3 or 33 cycles. * Optional Tightly-Coupled Memory (TCM): 0 to 1 MB instruction-TCM, 0 to 1 MB data-TCM, each with optional ECC. * External interrupts: 0, 1, 8, 16, 32. * Debug: none, reduced, full. * Data endianness: little-endian or BE-8 big-endian. * OS extension: present or absent.


Chips

The following vendors support the Cortex-M1 as soft-cores on their FPGA chips: *
Altera Altera Corporation was a manufacturer of programmable logic devices (PLDs) headquartered in San Jose, California. It was founded in 1983 and acquired by Intel in 2015. The main product lines from Altera were the flagship Stratix series, mid-rang ...
Cyclone-II, Cyclone-III, Stratix-II, Stratix-III * GOWIN M1 *
Actel Actel Corporation (formerly NASDAQ:ACTL) was an American manufacturer of nonvolatile, low-power field-programmable gate arrays (FPGAs), mixed-signal FPGAs, and programmable logic solutions. It was headquartered in Mountain View, California, with ...
/ Microsemi/
Microchip An integrated circuit or monolithic integrated circuit (also referred to as an IC, a chip, or a microchip) is a set of electronic circuits on one small flat piece (or "chip") of semiconductor material, usually silicon. Large numbers of tiny ...
Fusion, IGLOO/e, ProASIC3L, ProASIC3/E * Xilinx Spartan-3, Virtex-2, Virtex-3, Virtex-4, Artix-7


Cortex-M3

Key features of the Cortex-M3 core are:Cortex-M3 r2p1 Technical Reference Manual; Arm Holdings.
/ref> * ARMv7-M architecture * 3-stage pipeline with branch speculation. * Instruction sets: ** Thumb-1 (entire). ** Thumb-2 (entire). ** 32-bit hardware integer multiply with 32-bit or 64-bit result, signed or unsigned, add or subtract after the multiply. 32-bit multiply is 1 cycle, but 64-bit multiply and MAC instructions require extra cycles. ** 32-bit hardware integer divide (2–12 cycles). ** saturation arithmetic support. * 1 to 240 interrupts, plus NMI. * 12 cycle interrupt latency. * Integrated sleep modes. Silicon options: * Optional Memory Protection Unit (MPU): 0 or 8 regions.


Chips

The following microcontrollers are based on the Cortex-M3 core: * ABOV AC33Mx128, AC33Mx064 *
Actel Actel Corporation (formerly NASDAQ:ACTL) was an American manufacturer of nonvolatile, low-power field-programmable gate arrays (FPGAs), mixed-signal FPGAs, and programmable logic solutions. It was headquartered in Mountain View, California, with ...
/ Microsemi/
Microchip An integrated circuit or monolithic integrated circuit (also referred to as an IC, a chip, or a microchip) is a set of electronic circuits on one small flat piece (or "chip") of semiconductor material, usually silicon. Large numbers of tiny ...
SmartFusion, SmartFusion 2 (FPGA) *
Analog Devices Analog Devices, Inc. (ADI), also known simply as Analog, is an American multinational semiconductor company specializing in data conversion, signal processing and power management technology, headquartered in Wilmington, Massachusetts. The co ...
ADUCM360, ADUCM361, ADUCM3029 *
Broadcom Broadcom Inc. is an American designer, developer, manufacturer and global supplier of a wide range of semiconductor and infrastructure software products. Broadcom's product offerings serve the data center, networking, software, broadband, wirel ...
Wi-Fi Chip BCM4319XKUBG * Cypress PSoC 5000, 5000LP, FM3 *
Holtek Holtek Semiconductor () is a Taiwan-based semiconductor design centre and provider with its headquarters and design operations based in the Hsinchu Science Park in Taiwan, and has sales offices located in USA and India. Holtek's design focus is i ...
HT32F *
Infineon Infineon Technologies AG is a German semiconductor manufacturer founded in 1999, when the semiconductor operations of the former parent company Siemens AG were spun off. Infineon has about 50,280 employees and is one of the ten largest semicon ...
TLE9860, TLE987x * Microchip (Atmel)
SAM Sam, SAM or variants may refer to: Places * Sam, Benin * Sam, Boulkiemdé, Burkina Faso * Sam, Bourzanga, Burkina Faso * Sam, Kongoussi, Burkina Faso * Sam, Iran * Sam, Teton County, Idaho, United States, a populated place People and fictiona ...
3A, 3N, 3S, 3U, 3X *
NXP NXP Semiconductors N.V. (NXP) is a Dutch semiconductor designer and manufacturer with headquarters in Eindhoven, Netherlands. The company employs approximately 31,000 people in more than 30 countries. NXP reported revenue of $11.06 billion in 2 ...
LPC1300 LPC is a family of 32-bit microcontroller integrated circuits by NXP Semiconductors (formerly Philips Semiconductors). The LPC chips are grouped into related series that are based around the same 32-bit ARM processor core, such as the Cortex- ...
,
LPC1700 LPC is a family of 32-bit microcontroller integrated circuits by NXP Semiconductors (formerly Philips Semiconductors). The LPC chips are grouped into related series that are based around the same 32-bit ARM processor core, such as the Cortex- ...
, LPC1800 * ON Semiconductor Q32M210 *
Realtek Realtek Semiconductor Corp () is a fabless semiconductor company situated in the Hsinchu Science Park, Hsinchu, Taiwan. Realtek was founded in October 1987 and subsequently listed on the Taiwan Stock Exchange in 1998. Realtek currently manufa ...
RTL8710 * Silicon Labs Precision32 * Silicon Labs ( Energy Micro) EFM32 Tiny, Gecko, Leopard, Giant * ST STM32 F1, F2, L1, W * TDK-Micronas HVC4223F * Texas Instruments F28, LM3, TMS470,
OMAP 4 The OMAP (Open Multimedia Applications Platform) family, developed by Texas Instruments, was a series of image/ video processors. They are proprietary system on chips (SoCs) for portable and mobile multimedia applications. OMAP devices generall ...
, SimpleLink Wireless MCUs (CC1310 Sub-GHz and CC2650 BLE+
ZigBee Zigbee is an IEEE 802.15.4-based specification for a suite of high-level communication protocols used to create personal area networks with small, low-power digital radios, such as for home automation, medical device data collection, and oth ...
+
6LoWPAN 6LoWPAN (acronym of "IPv6 over Low-Power Wireless Personal Area Networks") in '6LoWPAN: The Embedded Internet', Shelby and Bormann redefine the 6LoWPAN acronym as "IPv6 over lowpower wireless area networks," arguing that "Personal" is no longer re ...
) * Toshiba TX03 The following chips have a Cortex-M3 as a secondary core: *
Apple A9 The Apple A9 is a 64-bit ARM-based system-on-chip (SoC), designed by Apple Inc. Manufactured for Apple by both TSMC and Samsung, it first appeared in the iPhone 6S and 6S Plus which were introduced on September 9, 2015. Apple states that it has ...
(Cortex-M3 as integrated M9 motion co-processor) * CSR Quatro 5300 (Cortex-M3 as co-processor) * Samsung
Exynos Exynos, formerly Hummingbird (), is a series of ARM-based system-on-chips developed by Samsung Electronics' System LSI division and manufactured by Samsung Foundry. It is a continuation of Samsung's earlier S3C, S5L and S5P line of SoCs. Ex ...
7420 (Cortex-M3 as a DVS microcontroller) * Texas Instruments F28, LM3, TMS470, OMAP 4470 (one
Cortex-A9 The ARM Cortex-A9 MPCore is a 32-bit multi-core processor that provides up to 4 cache-coherent cores, each implementing the ARM v7 architecture instruction set. It was introduced in 2007. Features Key features of the Cortex-A9 core are: * ...
+ two Cortex-M3) *
XMOS XMOS is a fabless semiconductor company that develops audio products and multicore microcontrollers. Company history XMOS was founded in July 2005 by Ali Dixon, James Foster, Noel Hurley, David May, and Hitesh Mehta. It received seed funding ...
XS1-XA (seven xCORE + one Cortex-M3) The following FPGAs include a Cortex-M3 core: * Microsemi SmartFusion2 SoC The following vendors support the Cortex-M3 as soft-cores on their FPGA chips: *
Altera Altera Corporation was a manufacturer of programmable logic devices (PLDs) headquartered in San Jose, California. It was founded in 1983 and acquired by Intel in 2015. The main product lines from Altera were the flagship Stratix series, mid-rang ...
Cyclone-II, Cyclone-III, Stratix-II, Stratix-III * Xilinx Spartan-3, Virtex-2, Virtex-3, Virtex-4, Artix-7


Cortex-M4

Conceptually the Cortex-M4 is a Cortex-M3 plus DSP instructions, and optional floating-point unit (FPU). A core with an FPU is known as Cortex-M4F. Key features of the Cortex-M4 core are:Cortex-M4 Technical Reference Manual Revision r0p1; Arm Holdings.
/ref> * ARMv7E-M architecture * 3-stage pipeline with branch speculation. * Instruction sets: ** Thumb-1 (entire). ** Thumb-2 (entire). ** 32-bit hardware integer multiply with 32-bit or 64-bit result, signed or unsigned, add or subtract after the multiply. 32-bit Multiply and MAC are 1 cycle. ** 32-bit hardware integer divide (2–12 cycles). ** Saturation arithmetic support. ** DSP extension: Single cycle 16/32-bit MAC, single cycle dual 16-bit MAC, 8/16-bit SIMD arithmetic. * 1 to 240 interrupts, plus NMI. * 12 cycle interrupt latency. * Integrated sleep modes. Silicon options: * Optional floating-point unit (FPU): single-precision only IEEE-754 compliant. It is called the FPv4-SP extension. * Optional memory protection unit (MPU): 0 or 8 regions.


Chips

The following microcontrollers are based on the Cortex-M4 core: *
Analog Devices Analog Devices, Inc. (ADI), also known simply as Analog, is an American multinational semiconductor company specializing in data conversion, signal processing and power management technology, headquartered in Wilmington, Massachusetts. The co ...
ADSP-CM40x * Microchip (Atmel)
SAM Sam, SAM or variants may refer to: Places * Sam, Benin * Sam, Boulkiemdé, Burkina Faso * Sam, Bourzanga, Burkina Faso * Sam, Kongoussi, Burkina Faso * Sam, Iran * Sam, Teton County, Idaho, United States, a populated place People and fictiona ...
4L, 4N, 4S *
NXP NXP Semiconductors N.V. (NXP) is a Dutch semiconductor designer and manufacturer with headquarters in Eindhoven, Netherlands. The company employs approximately 31,000 people in more than 30 countries. NXP reported revenue of $11.06 billion in 2 ...
( Freescale) Kinetis K, W2 * Texas Instruments SimpleLink Wi-Fi CC32xx, CC32xxMOD The following microcontrollers are based on the Cortex-M4F (M4 +
FPU FPU may stand for: Universities * Florida Polytechnic University, in Lakeland, Florida, United States * Franklin Pierce University, in New Hampshire, United States * Fresno Pacific University, in California, United States * Fukui Prefectural Un ...
) core: *
Analog Devices Analog Devices, Inc. (ADI), also known simply as Analog, is an American multinational semiconductor company specializing in data conversion, signal processing and power management technology, headquartered in Wilmington, Massachusetts. The co ...
ADUCM4050 * Cypress 6200 (one Cortex-M4F + one Cortex-M0+), FM4 *
Infineon Infineon Technologies AG is a German semiconductor manufacturer founded in 1999, when the semiconductor operations of the former parent company Siemens AG were spun off. Infineon has about 50,280 employees and is one of the ten largest semicon ...
XMC4000 *
Maxim Maxim or Maksim may refer to: Entertainment * ''Maxim'' (magazine), an international men's magazine ** ''Maxim'' (Australia), the Australian edition ** ''Maxim'' (India), the Indian edition * Maxim Radio, ''Maxim'' magazine's radio channel on Si ...
Darwin * Microchip (Atmel) SAM4C (Dual core: one Cortex-M4F + one Cortex-M4), SAM4E, SAMG5, SAMD5/E5x * Nordic nRF52 *
Nuvoton Nuvoton Technology Corporation () is a Taiwan-based semiconductor company established in 2008. It spun off from Winbond Electronics Corp. as a wholly owned subsidiary. Overview Nuvoton's main product lines are microcontroller application IC, ...
NuMicro M480 *
NXP NXP Semiconductors N.V. (NXP) is a Dutch semiconductor designer and manufacturer with headquarters in Eindhoven, Netherlands. The company employs approximately 31,000 people in more than 30 countries. NXP reported revenue of $11.06 billion in 2 ...
LPC4000, LPC4300 (one Cortex-M4F + one Cortex-M0), LPC54000 *
NXP NXP Semiconductors N.V. (NXP) is a Dutch semiconductor designer and manufacturer with headquarters in Eindhoven, Netherlands. The company employs approximately 31,000 people in more than 30 countries. NXP reported revenue of $11.06 billion in 2 ...
( Freescale) Kinetis K, V3, V4, S32K14x * Renesas S3, S5, S7, RA4, RA6 * Silicon Labs ( Energy Micro) EFM32 Wonder * ST STM32 F3, F4, L4, L4+, G4, WB (one Cortex-M4F + one Cortex-M0+) * Texas Instruments LM4F, TM4C, MSP432, CC13x2R, CC1352P, CC26x2R * Toshiba TX04 The following chips have either a Cortex-M4 or M4F as a secondary core: *
NXP NXP Semiconductors N.V. (NXP) is a Dutch semiconductor designer and manufacturer with headquarters in Eindhoven, Netherlands. The company employs approximately 31,000 people in more than 30 countries. NXP reported revenue of $11.06 billion in 2 ...
( Freescale) Vybrid VF6 (one Cortex-A5 + one Cortex-M4F) *
NXP NXP Semiconductors N.V. (NXP) is a Dutch semiconductor designer and manufacturer with headquarters in Eindhoven, Netherlands. The company employs approximately 31,000 people in more than 30 countries. NXP reported revenue of $11.06 billion in 2 ...
( Freescale) i.MX 6 SoloX (one Cortex-A9 + one Cortex-M4F) *
NXP NXP Semiconductors N.V. (NXP) is a Dutch semiconductor designer and manufacturer with headquarters in Eindhoven, Netherlands. The company employs approximately 31,000 people in more than 30 countries. NXP reported revenue of $11.06 billion in 2 ...
( Freescale) i.MX 7 Solo/Dual (one or two Cortex-A7 + one Cortex-M4F) *
NXP NXP Semiconductors N.V. (NXP) is a Dutch semiconductor designer and manufacturer with headquarters in Eindhoven, Netherlands. The company employs approximately 31,000 people in more than 30 countries. NXP reported revenue of $11.06 billion in 2 ...
( Freescale) i.MX 8 (two Cortex-A72 + four Cortex-A53 + two Cortex-M4F) *
NXP NXP Semiconductors N.V. (NXP) is a Dutch semiconductor designer and manufacturer with headquarters in Eindhoven, Netherlands. The company employs approximately 31,000 people in more than 30 countries. NXP reported revenue of $11.06 billion in 2 ...
( Freescale) i.MX 8M and 8M Mini (four Cortex-A53 + one Cortex-M4F) *
NXP NXP Semiconductors N.V. (NXP) is a Dutch semiconductor designer and manufacturer with headquarters in Eindhoven, Netherlands. The company employs approximately 31,000 people in more than 30 countries. NXP reported revenue of $11.06 billion in 2 ...
( Freescale) i.MX 8X (four Cortex-A35 + one Cortex-M4F) * ST STM32MP1 (one or two
Cortex-A7 The ARM Cortex-A7 MPCore is a 32-bit microprocessor core licensed by ARM Holdings implementing the ARMv7-A architecture announced in 2011. Overview It has two target applications; firstly as a smaller, simpler, and more power-efficient success ...
+ one Cortex-M4) * Texas Instruments OMAP 5 (two
Cortex-A15 The ARM Cortex-A15 MPCore is a 32-bit processor core licensed by ARM Holdings implementing the ARMv7-A architecture. It is a multicore processor with out-of-order superscalar pipeline running at up to 2.5 GHz. Overview ARM has claimed th ...
s + two Cortex-M4) * Texas Instruments Sitara AM5700 (one or two
Cortex-A15 The ARM Cortex-A15 MPCore is a 32-bit processor core licensed by ARM Holdings implementing the ARMv7-A architecture. It is a multicore processor with out-of-order superscalar pipeline running at up to 2.5 GHz. Overview ARM has claimed th ...
s + two Cortex-M4s as image processing units + two Cortex-M4s as general purpose units)


Cortex-M7

The Cortex-M7 is a high-performance core with almost double the power efficiency of the older Cortex-M4. It features a 6-stage
superscalar A superscalar processor is a CPU that implements a form of parallelism called instruction-level parallelism within a single processor. In contrast to a scalar processor, which can execute at most one single instruction per clock cycle, a supe ...
pipeline with
branch prediction In computer architecture, a branch predictor is a digital circuit that tries to guess which way a branch (e.g., an if–then–else structure) will go before this is known definitively. The purpose of the branch predictor is to improve the flow ...
and an optional floating-point unit capable of single-precision and optionally
double-precision Double-precision floating-point format (sometimes called FP64 or float64) is a floating-point number format, usually occupying 64 bits in computer memory; it represents a wide dynamic range of numeric values by using a floating radix point. Flo ...
operations. The instruction and data buses have been enlarged to 64-bit wide over the previous 32-bit buses. If a core contains an FPU, it is known as a Cortex-M7F, otherwise it is a Cortex-M7. Key features of the Cortex-M7 core are:Cortex-M7 Technical Reference Manual; Arm Holdings.
/ref> * ARMv7E-M architecture. * 6-stage pipeline with branch speculation. Longest of all ARM Cortex-M cores. * Instruction sets: ** Thumb-1 (entire). ** Thumb-2 (entire). ** 32-bit hardware integer multiply with 32-bit or 64-bit result, signed or unsigned, add or subtract after the multiply. 32-bit Multiply and MAC are 1 cycle. ** 32-bit hardware integer divide (2–12 cycles). ** Saturation arithmetic support. ** DSP extension: Single cycle 16/32-bit MAC, single cycle dual 16-bit MAC, 8/16-bit SIMD arithmetic. * 1 to 240 interrupts, plus NMI. * 12 cycle interrupt latency. * Integrated sleep modes. Silicon options: * Optional floating-point unit (FPU): (single precision) or (single and double-precision), both IEEE-754-2008 compliant. It is called the FPv5 extension. * Optional
CPU cache A CPU cache is a hardware cache used by the central processing unit (CPU) of a computer to reduce the average cost (time or energy) to access data from the main memory. A cache is a smaller, faster memory, located closer to a processor core, which ...
: 0 to 64 KB instruction-cache, 0 to 64 KB data-cache, each with optional ECC. * Optional Tightly-Coupled Memory (TCM): 0 to 16 MB instruction-TCM, 0 to 16 MB data-TCM, each with optional ECC. * Optional Memory Protection Unit (MPU): 8 or 16 regions. * Optional Embedded Trace Macrocell (ETM): instruction-only, or instruction and data. * Optional Retention Mode (with Arm Power Management Kit) for Sleep Modes.


Chips

The following microcontrollers are based on the Cortex-M7 core: * Microchip (Atmel)
SAM Sam, SAM or variants may refer to: Places * Sam, Benin * Sam, Boulkiemdé, Burkina Faso * Sam, Bourzanga, Burkina Faso * Sam, Kongoussi, Burkina Faso * Sam, Iran * Sam, Teton County, Idaho, United States, a populated place People and fictiona ...
E7, S7, V7 *
NXP NXP Semiconductors N.V. (NXP) is a Dutch semiconductor designer and manufacturer with headquarters in Eindhoven, Netherlands. The company employs approximately 31,000 people in more than 30 countries. NXP reported revenue of $11.06 billion in 2 ...
( Freescale) Kinetis KV5x, i.MX RT, S32K3xx * ST STM32 F7, H7


Cortex-M23

The Cortex-M23 core was announced in October 2016New ARM Cortex-M processors offer the next industry standard for secure IoT; Arm Holdings; October 25, 2016.
/ref> and based on the newer ARMv8-M architecture that was previously announced in November 2015.ARMv8-M Architecture Simplifies Security for Smart Embedded Devices; Arm Holdings; November 10, 2015.
/ref> Conceptually the Cortex-M23 is similar to a Cortex-M0+ plus integer divide instructions and TrustZone security features, and also has a 2-stage instruction pipeline. Key features of the Cortex-M23 core are:Cortex-M23 r1p0 Technical Reference Manual; Arm Holdings.
/ref> * ARMv8-M Baseline architecture. * 2-stage pipeline. (similar to Cortex-M0+) *
TrustZone ARM (stylised in lowercase as arm, formerly an acronym for Advanced RISC Machines and originally Acorn RISC Machine) is a family of reduced instruction set computer (RISC) instruction set architectures for computer processors, configured ...
security instructions. (available only in M23/M33/M35P) * 32-bit hardware integer divide (17 or 34 cycles). (not available in M0/M0+/M1) (slower than divide in all other cores) * Stack limit boundaries. (available only with SAU option) (available in M23/M33/M35P) Silicon options: * Hardware integer multiply speed: 1 or 32 cycles. * Hardware integer divide speed: 17 or 34 cycles maximum. Depending on divisor, instruction may complete in fewer cycles. * Optional Memory Protection Unit (MPU): 0, 4, 8, 12, 16 regions. * Optional Security Attribution Unit (SAU): 0, 4, 8 regions. * Single-cycle I/O port (available in M0+/M23). * Micro Trace Buffer (MTB) (available in M0+/M23/M33/M35P).


Chips

The following microcontrollers are based on the Cortex-M23 core: *
GigaDevice GigaDevice Semiconductor () is a Chinese NOR flash memory designer. It also produces microcontrollers, some of them are based on the ARM architecture (GD32 series), and other on the RISC-V architecture (GD32V series). GD32 chips were introduce ...
GD32E230 *
Microchip An integrated circuit or monolithic integrated circuit (also referred to as an IC, a chip, or a microchip) is a set of electronic circuits on one small flat piece (or "chip") of semiconductor material, usually silicon. Large numbers of tiny ...
SAM L10, L11 *
Nuvoton Nuvoton Technology Corporation () is a Taiwan-based semiconductor company established in 2008. It spun off from Winbond Electronics Corp. as a wholly owned subsidiary. Overview Nuvoton's main product lines are microcontroller application IC, ...
M2351 * Renesas S1JA, RA2A1, RA2L1, RA2E1, RA2E2


Cortex-M33

The Cortex-M33 core was announced in October 2016 and based on the newer ARMv8-M architecture that was previously announced in November 2015. Conceptually the Cortex-M33 is similar to a cross of Cortex-M4 and Cortex-M23, and also has a 3-stage instruction pipeline. Key features of the Cortex-M33 core are:Cortex-M33 r0p3 Technical Reference Manual; Arm Holdings.
/ref> * ARMv8-M Mainline architecture. * 3-stage pipeline. *
TrustZone ARM (stylised in lowercase as arm, formerly an acronym for Advanced RISC Machines and originally Acorn RISC Machine) is a family of reduced instruction set computer (RISC) instruction set architectures for computer processors, configured ...
security instructions. (available only in M23/M33/M35P) * 32-bit hardware integer divide (11 cycles maximum). (not available in M0/M0+/M1) * Stack limit boundaries. (available only with SAU option) (available in M23/M33/M35P) Silicon options: * Optional Floating-Point Unit (FPU): single-precision only IEEE-754 compliant. It is called the FPv5 extension. * Optional Memory Protection Unit (MPU): 0, 4, 8, 12, 16 regions. * Optional Security Attribution Unit (SAU): 0, 4, 8 regions. * Micro Trace Buffer (MTB) (available in M0+/M23/M33/M35P).


Chips

The following microcontrollers are based on the Cortex-M33 core: *
Analog Devices Analog Devices, Inc. (ADI), also known simply as Analog, is an American multinational semiconductor company specializing in data conversion, signal processing and power management technology, headquartered in Wilmington, Massachusetts. The co ...
ADUCM410, ADUCM420 * Dialog DA1469x *
GigaDevice GigaDevice Semiconductor () is a Chinese NOR flash memory designer. It also produces microcontrollers, some of them are based on the ARM architecture (GD32 series), and other on the RISC-V architecture (GD32V series). GD32 chips were introduce ...
GD32E50x, GD32W515 * Nordic nRF91, nRF5340 *
NXP NXP Semiconductors N.V. (NXP) is a Dutch semiconductor designer and manufacturer with headquarters in Eindhoven, Netherlands. The company employs approximately 31,000 people in more than 30 countries. NXP reported revenue of $11.06 billion in 2 ...
LPC5500, i.MX RT600 * Renesas RA4, RA6 * ST STM32 L5, U5 * Silicon Labs Wireless Gecko Series 2


Cortex-M35P

The Cortex-M35P core was announced in May 2018. It is conceptually a Cortex-M33 core with a new instruction cache, plus new tamper-resistant hardware concepts borrowed from the ARM SecurCore family, and configurable parity and ECC features. Limited public information is currently available for the Cortex-M35P until its ''Technical Reference Manual'' is released.


Chips

The following microcontrollers are based on the Cortex-M35P core: * As of July 2021, no chips have been announced.


Cortex-M55

The Cortex-M55 core was announced in February 2020 and is based on the Armv8.1-M architecture that was previously announced in February 2019. It also has a 4-stage instruction pipeline. Key features of the Cortex-M55 core include: * ARMv8.1-M Mainline/Helium architecture. * 4-stage pipeline. * Stack limit boundaries (available only with SAU option). Silicon options: * Helium (M-Profile Vector Extension, MVE) * Single-Precision and Double-Precision floating-point * Digital Signal Processing (DSP) extension support *
TrustZone ARM (stylised in lowercase as arm, formerly an acronym for Advanced RISC Machines and originally Acorn RISC Machine) is a family of reduced instruction set computer (RISC) instruction set architectures for computer processors, configured ...
security extension support * Safety and reliability (RAS) support * Coprocessor support * Secure and Non-secure MPU with 0, 4, 8, 12, or 16 regions * SAU with 0, 4, or 8 regions * Instruction cache with size of 4KB, 8KB, 16KB, 32KB, 64KB * Data cache with size of 4KB, 8KB, 16KB, 32KB, 64KB * ECC on caches and TCMs * 1–480 interrupts * 3–8 exception priority bits * Internal and external WIC options, optional CTI, ITM, and DWT * ARM Custom Instructions (available in a future release)


Chips


Alif Semiconductor
Ensemble and Crescendo MCU families offer single or dual Cortex-M55 cores, each paired with Ethos-U55 NPUs


Development tools


Documentation

The documentation for ARM chips is extensive. In the past, 8-bit microcontroller documentation would typically fit in a single document, but as microcontrollers have evolved, so has everything required to support them. A documentation package for ARM chips typically consists of a collection of documents from the IC manufacturer as well as the CPU core vendor (
Arm Holdings Arm is a British semiconductor and software design company based in Cambridge, England. Its primary business is in the design of ARM processors (CPUs). It also designs other chips, provides software development tools under the DS-5, RealView ...
). A typical top-down documentation tree is: ;Documentation tree (top to bottom) # IC manufacturer website. # IC manufacturer marketing slides. # IC manufacturer datasheet for the exact physical chip. # IC manufacturer reference manual that describes common peripherals and aspects of a physical chip family. # ARM core website. # ARM core generic user guide. # ARM core technical reference manual. # ARM architecture reference manual. IC manufacturers have additional documents, such as: evaluation board user manuals, application notes, getting started guides, software library documents, errata, and more. See External links section for links to official Arm documents.


See also

* ARM architecture * List of ARM architectures and cores * JTAG, SWD * Interrupt,
Interrupt handler In computer systems programming, an interrupt handler, also known as an interrupt service routine or ISR, is a special block of code associated with a specific interrupt condition. Interrupt handlers are initiated by hardware interrupts, softwar ...
*
Real-time operating system A real-time operating system (RTOS) is an operating system (OS) for real-time applications that processes data and events that have critically defined time constraints. An RTOS is distinct from a time-sharing operating system, such as Unix, which m ...
,
Comparison of real-time operating systems This is a list of real-time operating systems (RTOSs). This is an operating system An operating system (OS) is system software that manages computer hardware, software resources, and provides common services for computer programs. Time-s ...


References


Further reading

* ''Embedded Systems with ARM Cortex-M Microcontrollers in Assembly Language and C''; 3rd Ed; Yifeng Zhu; 738 pages; 2017; . * ''Designer's Guide to the Cortex-M Processor Family''; 2nd Ed; Trevor Martin; 490 pages; 2016; . * ''ARM Assembly for Embedded Applications''; 3rd Ed; Daniel Lewis; 318 pages; 2017; . * ''Definitive Guide to the ARM Cortex-M0 and Cortex-M0+ Processors''; 2nd Ed; Joseph Yiu; 784 pages; 2015; . * ''Definitive Guide to the ARM Cortex-M3 and Cortex-M4 Processors''; 3rd Ed; Joseph Yiu; 600 pages; 2013; . * ''Digital Signal Processing and Applications Using the ARM Cortex-M4''; 1st Ed; Donald Reay; 250 pages; 2014; . * ''Embedded Systems: Introduction to ARM Cortex-M Microcontrollers''; 5th Ed; Jonathan Valvano; 506 pages; 2012; . * ''Assembly Language Programming: ARM Cortex-M3''; 1st Ed; Vincent Mahout; 256 pages; 2012; .


External links

;ARM Cortex-M official documents *
Cortex-M for Beginners
arm.com
ARMv8-M Security Extensions
arm.com

arm.com : ;Quick reference cards * Instructions: Thumb-1
1
, ARM and Thumb-2
2
, Vector Floating-Point
3
arm.com * Opcodes: Thumb-1
12
, ARM
34
, GNU Assembler Directives
5
. ;Migrating
Migrating from 8051 to Cortex-M3
– arm.com
Migrating from PIC to Cortex-M3
– arm.com
Migrating from ARM7TDMI to Cortex-M3
– arm.com
Migrating from Cortex-M4 to Cortex-M7
– keil.com ;Other
Bit Banding on STM32 Cortex-M microcontrollers
{{Clear
Cortex-M The ARM Cortex-M is a group of 32-bit RISC ARM processor cores licensed by Arm Holdings. These cores are optimized for low-cost and energy-efficient integrated circuits, which have been embedded in tens of billions of consumer devices. Though ...
ARM cores