Brand new M261/M262/M263 Series Microcontroller with Low Power and Robust Security designed for IoT applications

Published  August 16, 2019   0
Nuvoton M261/M262/M263 Series Microcontroller with Low Power and Robust Security designed for IoT applications

Nuvoton Technology Corporation releases a new line up of low power, robust security M261/M262/M263 series microcontroller designed for IoT applications. The new MCUs are based on Arm®Cortex®-M23 secure core for Armv8-M architecture and can run up to 64 MHz with 512 KB Flash in dual bank mode, with the support of Over-The-Air (OTA) Firmware update and 96 KB SRAM. The new MCUs will fulfil the need of new generation IoT applications. The new microcontrollers features low power and security technology with high performance connectivity interface where low power consumptions in the normal run is down to 45 μA/MHz in DC-DC mode and security technology includes a secure boot function and hardware crypto acceleration. The integration of USB 2.0 FS OTG, SDHC 2.0, CAN Bus 2.0B high-performance communication interface, and a 3.76 MSPS ADC for sensing data from sensor devices makes it an ideal choice for various applications such as smart home and IoT node device product design.


The NuMicro® M261/M262/M263 series is based on Arm® Cortex®-M23 core for Armv8-M architecture with the downward compatibility of code with Nuvoton Arm® Cortex®-M0 microcontrollers. The MCUs provide multiple power modes for different operating scenarios and integrates RTC with independent VBAT to support low power mode. The MCUs are well suited for battery operations with its rich features such as low power, low supply voltage, and fast wake-up (9 μs from Fast-wakeup Power-down mode). The security functions such as secure boot function ensures that the device boots using only trusted software through a series of digital signature authentication processes. The NuMicro MCU comes with complete hardware crypto engines such as AES 256/192/128, DES/3-DES, SHA, ECC, and True Random Number Generator (TRNG). Also, it features 4-region programable eXecute-Only-Memory (XOM) to secure critical program codes and up to six tamper detection pins against outer physical attack, which significantly improves the product security.


NuMicro® M261/M262/M263 specifications:

  • Voltage range: 1.8 V ~ 3.6 V
  • Temperature range: -40 °C ~ +105 °C
  • Core: Arm® Cortex®-M23 processor, Armv8-M, runs up to 64 MHz
  • Flash: 512 KB, dual bank, for OTA upgrade
  • SRAM: 96 KB
  • Communication interfaces:
    • Up to 6 sets of LPUART interface
    • Up to 3 sets of I²C interface
    • Up to 1 set of QSPI interface
    • Up to 4 set of SPI / I²S interface ( Configured as SPI or I²S )
    • Up to 3 sets of Smart Card Interface ( ISO-7816-3, ISO-7816-3 supports full duplex UART mode )
    • Up to 2 sets of USCI ( Configured as UART, SPI or I²C )
    • Up to 1 set of Secure Digital Host Controllers ( SDHC ), compliant with SD Memory Card Specification Version 2.0
    • 16 / 8-bits EBI ( External Bus Interface ) in
  • PWM: Up to 24-channels PWM
  • Timers: Up to four 32-bit timers
  • UID: 96-bit Unique ID ( UID )
  • UCID: 128-bit Unique Customer ID ( UCID )
  • Package: QFN33 ( 5 mm x 5 mm ), LQFP64 ( 7 mm x 7 mm ), LQFP128 ( 14 mm x 14 mm )


NuMicro® M261/ M262 / M263 series consists of three series

  • NuMicro® M261 series - suitable for classic IoT node devices and wireless communication modules applications
  • NuMicro® M262 USB 2.0 FS OTG series - integrating 1 set of USB 2.0 FS OTG interface (crystal-less design), suitable for connecting USB host/device for data transfer
  • NuMicro® M263 USB/CAN series - integrating 1 set of CAN Bus 2.0B and 1 set of USB 2.0 FS OTG interface (crystal-less design), suitable for industrial and automotive applications requiring CAN Bus for data communication.

The Nuvoton provides two types of evaluation boards NuMaker-IoT-M263 and NuMaker-M263KI for faster development and prototyping. The NuMaker-IoT-M263 board is a new platform mainly focused on IoT products design and integrates 9-axis sensor, environmental sensor, and popular wireless communication modules including Wi-Fi module, Bluetooth module, and LoRa module. Nuvoton also provides IoT software package connecting the cloud of Arm Pelion, Amazon AWS, and Ali-Cloud is hazard-free to complete the development of IoT products quickly. The evaluation and product development can be done in Nu-Link debugger as well as with third-Party IDEs such as Keil MDK, IAR EWARM, and NuEclipse IDE with GNU GCC compilers.

The NuMicro® M261/M262/M263 series are available now from Nuvoton and more information can be gathered from Nuvoton website.