Wednesday, April 17, 2024

The Arm Cortex M4 CPU in Motor Control Applications

Arm Cortex M4 CPU

A 32-bit processing core intended for use in microcontrollers is the Arm Cortex M4 CPU. Because of its reputation for being strong and effective, it is a well-liked option for many different kinds of embedded systems.

Silent attributes


  • Considering its size and power consumption, it offers excellent performance.
  • Provides a three-step pipeline for effective execution of instructions.
  • Possible to get a Dhrystone Million Instructions Per Second per Megahertz of 1.25 DMIPS/MHz.

Power Efficiency:

  • Optimal for battery-operated devices, it is designed for low-power applications.
  • Provides options to cut down on power use while not in use, such as power gating and sleep modes.
  • Dedicated DSP instructions are included in digital signal processing (DSP) to execute mathematical calculations utilised in signal processing activities efficiently.
  • For applications like industrial automation, audio processing, and motor control, this makes it a good fit.

Optional Floating-Point Unit (FPU):

For applications needing computations with a greater level of accuracy, a single-precision FPU is available as an alternative.

Scalability and Usability:

  • Facilitates the easy porting of code across various Cortex-M based microcontrollers by supporting the Cortex Microcontroller Software Interface Standard (CMSIS).
  • This expedites the time to market for new goods and streamlines development.


The Cortex-M4 is used in many embedded systems due to its versatility. Some common examples:

  • Automation controls motors, sensors, and other equipment in factories and other industrial environments.
  • Motor control runs electric motors in power equipment, robots, and drones.
  • Power management controls solar inverters and battery chargers’ power supplies.
  • Processed audio signals in speakers, headphones, and musical instruments are embedded audio.
  • The Internet of Things (IoT) powers connected devices with processing, data collecting, and transfer.
  • Wearable electronics power fitness trackers, smartwatches, etc.

Toshiba Electronic Devices & Storage Corporation (“Toshiba”) has added eight new products with 512KB/1MB flash memory capacity and four types of packages to the M4K Group of the TXZ Family Advanced Class 32-micro controllers equipped with CortexM4 core with FPU.

Management and Efficiency for Mixed-Signal Equipment

The Arm Cortex M4 CPU family is intended to let developers construct power- and cost-efficient solutions for a wide variety of devices. The high-performance embedded Cortex-M4 processor was created to meet the needs of the digital signal control industries, which need a user-friendly, effective combination of control and signal processing capabilities.

Characteristics and Advantages of Arm Cortex M4 CPU

Floating Point Processing: Achieve More

With the integrated floating-point unit (FPU), you may reduce power consumption and increase battery life by 10 times for single precision floating-point computations. When paired with the Arm CMSIS-NN machine learning libraries, Cortex-M4 provide battery-operated embedded and Internet of Things devices cutting-edge intelligence.

Include DSP Features

By combining control and signal processing into a single processor, chip system costs may be decreased. MAC, SIMD, and integrated digital signal processing (DSP) instructions streamline software development, debugging, and overall system architecture. With a large library of DSP operations and C programming support, it streamlines signal processing, lowers development effort, and makes DSP more accessible to a wider audience.

Reduce Design Risk and Get to Market Quicker

One of the most popular Arm Cortex M4 CPU may help lower risk and provide first-time success. It is simple to build on existing software to produce powerful embedded devices with less work and a quicker time to market because to its wide ecosystem of tools, codecs, and other DSP code.

The Cortex-M4 processor Details

The Arm Cortex M4 CPU is designed to meet the needs of digital signal control industries that need a user-friendly, effective combination of signal processing and control functionality. Numerous markets are satisfied by the Cortex-M series of processors’ low power, cheap cost, and simplicity of use combined with their high efficiency signal processing capabilities. These sectors include embedded audio, power management, motor control, automotive, and industrial automation.

Essentials of Arm Cortex-M Microcontroller System-on-Chip Design

Get access to a thorough manual on embedded systems based on Arm Cortex-M processor cores, covering everything from the basics of microcontroller architectures and SoC-based designs to high-level hardware and software perspectives.

Arm cortex m4 microcontroller

Continuing advances in the functionality of motor applications supporting IoT is increasing demand for large program capacity and firmware over-the-air support.

The new products expand code flash memory capacity from the 256KB maximum of Toshiba’s current product to 512KB[1]/1MB[2], depending on the product, and RAM capacity from 24KB to 64KB. Other features, such as an Arm Cortex-M4 core running up to 160MHz, integrated code flash and 32KB data flash memory with 100K program/erase cycle endurance, have been maintained.

The microcontrollers also offer various interfaces and motor control options, such as advance-programmable motor driver (A-PMD), advanced encoder 32-bit (A-ENC32), advanced vector engine plus (A-VE+) and three units of high-speed, high-resolution 12-bit analog/digital converters. As a result, the M4K Group products contribute to wider application of IoT, and bring advanced functionality to AC motors, brushless DC motors and inverter controls.

The new products implement the 1MB code flash in two separate 512KB areas. This realizes firmware rotation with the memory swap method[3], allowing instructions to be read from one area while updated code is programmed into the other area in parallel.

Devices in the M4K Group have UART, TSPI and I2C integrated as general communications interfaces. Self-diagnosis functions incorporated in the devices for flash memory, RAM, ADC and Clock help customers to achieve IEC 60730 Class B functional safety certification.

Documentation, sample software with actual use examples, and driver software that controls the interfaces for each peripheral are available. Evaluation boards and development environments are provided in cooperation with Armglobal ecosystem partners.

Toshiba is planning to increase capacity of flash memory also for M4M Group with CAN interface.


  • Motors and inverter control of consumer products, industrial equipment
  • IoT of consumer products, industrial equipment, etc.


  • High-performance Cortex-M4 core with FPU, max 160MHz
  • Increased capacity of internal memory
  • Code flash memory: 512KB/1MB
  • RAM: 64KB
  • Memory swap method firmware rotation function, supporting firmware updates while the microcontroller continues to operate
  • Self-diagnosis functions for IEC 60730 class B functional safety
  • Four types of packages
Agarapu Ramesh was founder of the Govindhtech and Computer Hardware enthusiast. He interested in writing Technews articles. Working as an Editor of Govindhtech for one Year and previously working as a Computer Assembling Technician in G Traders from 2018 in India. His Education Qualification MSc.


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