M2351 Security IC (Arm Cortex-M23) > Nuvoton



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Microcontrollers M2351 Security IC (Arm Cortex-M23)

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The Nuvoton NuMicro® M2351 microcontroller series is powered by Arm® Cortex®-M23 core with TrustZone® for Armv8-M architecture, which elevates the traditional firmware security to a new level of robust software security. 

The low-power M2351 series microcontrollers operate at up to 64 MHz frequency, with up to 512 Kbytes embedded Flash memory in dual bank mode, supporting secure OTA (Over-The-Air) firmware update and up to 96 Kbytes embedded SRAM. Furthermore, the M2351 series also provides high-performance connectivity peripheral interfaces such as UART, SPI, I²C, GPIOs, USB and ISO 7816-3 for the smart card reader. Its secure and efficient power management features strengthen the innovation of IoT security.


TrustZone® for Arm®v8-M empowered

The NuMicro® M2351 series is empowered by the Arm® TrustZone® for Armv8-M architecture. Arm® TrustZone® technology is a System on Chip (SoC) and CPU system-wide approach to security. In addition to firmware-level security, the M2351 series offers a more enhanced software-level security for robust security and greater power efficiency.

In addition to the Cortex®-M23 core, the TrustZone® components of M2351 series include:

   Secure Attribution Unit (SAU, inside of Cortex®-M23 CPU)

   Implementation Defined Attribution Unit (IDAU)

   Flash Memory Controller (FMC)

   Security Configuration Unit (SCU, which supports SRAM and peripheral configurations)

As described in the figure, some functionalities are fixed to be secure attribution or secure resources accessible only for better software-level security assurance. Besides, other parts of the functionalities are designed to support TrustZone® implementation with bus master and bus slave IPs integration to realize the security functions.


Nuvoton Security Feature Strengthened

In addition to the TrustZone® technology, the NuMicro® M2351 series is also equipped with rich functions to improve system security. The Secure Bootloader supports trusted boot feature. The hardware crypto accelerators, including ECC, support encryption and decryption operations to offload the main processor’s computing power. The KPROM is a password protection mechanism to allow Flash memory write and erase. The XOM defines execute-only memory regions to protect critical program codes. The Flash lock bits are designed to disable external Flash read/write and debug interface. Tamper detection pins can detect the state transition on the tamper pins.


Power management technology for IoT Innovation

Other than security, power consumption is also vital for IoT applications. M2351 Series offers multiple power modes for more efficient power management. Regarding the power consumption of M2351 series, the normal run mode consumes 97 μA/MHz in LDO mode and 45 μA/MHz in DC-DC mode. The current consumption of stand-by power down mode is 2.8 μA and the deep power-down mode without VBAT is less than 2μA.


Arm® PSA  with Nuvoton Secure Microcontroller Platform (NuSMP) Supported

The Platform Security Architecture (PSA) is a holistic set of threat models, security analysis, hardware and firmware architecture specifications, and an open source firmware reference implementation. The PSA is a contribution from Arm® to the entire IoT ecosystem, offering common ground rules and a more economical approach to building more secure devices.

Nuvoton has developed the Nuvoton Secure Microcontroller Platform (NuSMP) to support Arm® PSA. The NuSMP is a range of hardware and software mixture technologies for security requirements of general purpose and secure IoT microcontrollers. With NuSMP, developers can easily achieve the secure services with the M2351 series in coverage of: Trusted Boot (Root of Trust), Secure OTA (Over-The-Air) firmware update (including secure software download), Power Management APIs for non-secure world and PC side crypto related development software tool.

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