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PSA Certified MCU Provides Secure Flash Storage Solution

Nuvoton Technology has announced its NuMicro M2351SF chip based on M2351 IoT security MCUs and Winbond TrustME W77F Secure Flash. The M2351 Series is the first Arm Cortex-M23 based MCU that has been both PSA Certified Level 1 and PSA Functional API Certified, says Nuvoton. The M2351SF is better enhanced for its secure storage inside by stacking the Winbond W77F Secure Flash solution.

Trust is essential for the in-developing trillion connected devices, and secure storage is one of the significant required security features, says Nuvoton. The M2351SF provides an enhanced security level of much bigger secure storage for code and data for different applications. Cybersecurity depends on mutual authentication through the end-to-end sides with IoT cloud services. To achieve the security goal, it needs a range of robust solutions including trusted boot, various keys, credentials, certificates, secure over-the-air updates for firmware and software. With the use of Winbond’s Secure Flash solution, M2351SF can protect the code and data of an MCU by reducing vulnerability exposures.

The Secure Flash provides encrypted storage for valuable assets of applications, such as biometric data, certificate authority (CA) data, system log and so on.

Furthermore, the M2351SF uses a unique binding approach in between the MCU and Secure Flash together with internal connecting by encrypted SPI bus interface to ensure the confidentiality, integrity, and availability for the digital assets of an MCU. MCU system developers can easily design applications for security assurance demanding markets like Secure Industries, Smart Home, Smart City and Smart Things as well as any other potential embedded devices.

In addition to the enhanced security of MCU storage, the M2351SF retains all all the security features of the M2351 Series, including Armv8-M TrustZone, Execute Only Memory (XOM), Cryptographic Hardware Accelerators, Secure Debug, system-level tamper detection pins and all software tools for application development available for the M2351 Series.

Major features of NuMicro M2351SF:


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  • Secure Storage Security
  • 4MB flash memory density
  • Package dimension is the same with M2351 Series (LQFP-64)
  • Countermeasures against a side-channel attack, unauthorized operations against attacks of reply, rollback, man-in-the-middle, sniffer, and fault injection during data transferring between the MCU and Flash memories
  • TrustZone Security and Low Power
  • TrustZone for Armv8-M based on Cortex-M23 CPU
  • Low-power consumption with LDO or DC-DC power supply

M2351 Series has been in volume production with LQFP-128, LQFP-64 and QFN-33 packages. The M2351SF chip in the LQFP-64 package now is also available in the same dimension of M2351 with almost pin-to-pin compatible.

Nuvoton Technology |

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PSA Certified MCU Provides Secure Flash Storage Solution

by Circuit Cellar Staff time to read: 2 min