The NuMicro^® M261 / M262 / M263 series is a low-power microcontroller platform based on Arm® Cortex®-M23 core for Armv8-M architecture. It runs up to 64 MHz with 512 Kbytes embedded Flash memory in dual bank mode supporting Over-The-Air ( OTA ) firmware update and 96 Kbytes embedded SRAM. It also supports low supply voltage from 1.8 ~ 3.6V and operating temperature range from - 40 ~ + 105 ℃

The industrial-grade NuMicro M251/ M252 series designed for industrial control applications. It is based on Arm Cortex-M23 secure core for Armv8-M architecture, running up to 48 MHz with up to 256 KB Flash and up to 32 KB SRAM. The power consumption in the deep power-down mode is down to 2.0 μA; NuMicro M251/M252 Series provides five kinds of power modes and three kinds of secure protect mechanisms to satisfy the sensor node devices which cares power consumption in IIoT applications.

Nuvoton NuMicro ML54 series is a low-power microcontroller, based on 1T 8051 core, embedded 64 KB flash and 4 KB SRAM, built-in LCD driver, running up-to 24 MHz. For low power operation, it runs less than 100 µA/MHz in normal run mode, and the power-down current is below 2 µA with LCD panel display on. The ML54 series operates from 1.8V to 3.6V and-40°C to 105°C.

NuMicro ML54 series builts in 4 COM x 32 SEG, 6 COM x 30 SEG, 8 COM x 28 SEG LCD controller to drive up to 224 dots, and supports the Type-A and Type-B LCD panel. It provides two V_LCD input sources, one is external voltage, and another is an internal charge pump, The internal charge pump keeps the V_LCD constant voltage to maintain the display quality of the LCD panel while V_DD input changes. There are two V_LCD driving modes, external capacitor mode, and internal resistor mode. The external capacitor mode with up to 200mA strong driving current to support a large size panel; the internal resistor mode drives a small size panel and reduces power consumption.

Nuvoton Technology launches a new NuMicro^® M031BT series: An low-power BLE 5.0 and 2.4GHz dual-mode microcontroller series by Arm^® Cortex^®-M0 core operating up to 48 MHz, with up to 128 KB Flash and 16 KB SRAM. In addition to the BLE 5.0 and 2.4GHz RF functions providing wireless connectivity, the NuMicro^® M031BT series built-in rich peripherals and analog functions applied to the applications that need IO control functions, such as industrial control that need wireless connectivity, sensor hubs in rigid working environments. The 5mm x 5mm QFN48 package greatly reduces the PCB size and RF layout difficulty, and Nuvoton provides a reference design and rich sample codes to speed up the application development based on this M031BT low-power BLE/2.4G RF microcontroller.

With the rise of IoT applications in recent years, related issues have sprung up.

Security in IoT has been widely discussed. Although the security issues seem to be very large and complex, it still has some guidance and method that could be referred which is based on experience. More and more frameworks and certifications have developed into a sound management mechanism based on them.

The author believes that to achieve a complete IoT security consideration is from the end-to-end system problems. From this point of view, the IoT security problem can be slightly converged into "improving the security considerations of new network nodes". This article will start from the IoT node side, analyzing and discussing the microcontroller (MCU) chip architecture design of the endpoint device side in the IoT environment.

M2354 Series inherits the security features of M2351 Series that has been PSA Certified™ Level 1, Level 2 and PSA Functional API Certified. In parallel, the M2354 Series can operate up to 96 MHz, and the 1 M-bytes Flash memory can support secure firmware over-the-air (OTA) update easily. With the multiple power management modes, M2354 Series has excellent low power performance with flexibility of operating modes. In Normal Run mode, it consumes 89.3 μA/ MHz with LDO power supply and 39.6 μA/ MHz with DC-DC power supply; less than 2 μA in Standby Power-Down mode. It is 0.5 μA for 80-bytes content retention of RTC registers in Deep Power-Down mode with V_BAT power supply. It can further down to 0.1 μA without the retention of the 80-bytes content of RTC registers. Moreover, the series is also equipped with plenty of peripherals, including up to 8 x 40/ COM x SEG LCD panel driver, Timers, PWM, UART, Qual-SPI (QSPI), SPI/ I2S, I2C, Smart Card Interface  (ISO 7816-3), SDHC 2.0, USB 2.0 Full-Speed On-The-Go transceiver for device-only, host-only or ID-dependent function and CAN 2.0B. 

Internet of Things (IoT) security encompasses device security and network security, and under this definition covers the processes, technologies, and protective measures required to protect networked devices and networks. In today's society, various types of networked devices are becoming more and more popular, from industrial devices, smart grids, smart homes, entertainment and wearable devices, etc. Suppose the possible risks are not well thought out at the time of development to analyze and evaluate the threat model. It is easy to cause vulnerabilities in use and then be attacked by people to cause losses. For example, if industrial devices are attacked, it may cause danger to personnel or leakage of confidential information; if hackers control the smart grid, it will affect people's livelihood and industries; it happens to intelligent homes and entertainment, and the risk is that personal data will be stolen. Therefore, how to do an excellent job of security protection from the device itself is an item that must be carefully considered at the early stage of the design and planning of networked products.

As the IoT application becomes more popular and makes the devices meet connectivity ability as a necessary feature, according to Bluetooth SIG release, the latest marketing research shows that the data transfer via Bluetooth technology will increase growth with 11% CAGR and up to 1.46 billion yearly shipments by 2025.