How does the Cortex-M3 MCU come out of the alternative 8-bit microcontroller replacement

Single chip microcomputer STM32L151CCU6

Industrial Router Crystal 3.2*2.5mm 3225 26M (26.000MHZ) 12PF 10PPM 20PPM 30PPM

Crystal oscillator

A while ago, the MCU market "smack" frequently came out. Due to the continuous decline in the profit of microcontroller products, Fujitsu Semiconductor first announced the sale of its MCU business, and then Samsung Semiconductor will not continue to fade out of the MCU market. However, there is not only bad news in the overcast MCU market. Recently, Silicon Labs announced the signing of the final agreement to acquire Energy Micro AS.

Mr. Zhang Yuangen, who is the well-known distributor of Silicon Labs MCU product line, is also responsible for the microcontroller business. "The main reason for the exit of Fujitsu Semiconductor and Samsung Semiconductor is that the profit of MCU is falling too much, and the technical advantage is not enough to make up. MCU vendors, Taiwanese and mainland Chinese newcomers are also pouring in, which further lower prices."

The market is fiercely competitive. Especially in the market where the same core is used, how to implement the differentiation and localization of product development and how to improve the cost performance of products is becoming a challenge that semiconductor manufacturers must face.

For example, for battery-powered handheld devices that use an 8-bit MCU alternative, a 32-bit product based on the ARMCortex-M3 core is probably the most appropriate option, with a high price/performance ratio, lower power consumption, and greater flexibility. But even Fujitsu's FM3 series can't be sold, TI will almost give up this market and turn to the main Cortex-M0, M4. How will the remaining players realize differentiated competition and kill a way of life?

Mr. Zhang Yuangen takes the example of the successful Precision32 mixed-signal MCU series from Silicon Labs (including the SiM3Uxxx series for USB applications, the SiM3Cxxx series for non-USB applications, and the SiM3Lxxx series for ultra-low-power applications). It analyzes how the Cortex-M3 MCU opens up a differentiated 8-bit alternative in industrial control instrumentation, smart home, portable medical, IoT wireless terminals, and computer peripherals.

Figure 1. Silicon Labs --- Hybrid Signal MCU Innovation.

32-bit single-chip microcomputer is the only way for 8-bit manufacturers to open up the application market. The most important thing is how to integrate well. It seems that Zhang San Li Si will integrate the ARM core, but the final effect is different. Zhang Yuangen pointed out: "Precision32 series products use Silicon Labs' patented Crossbar architecture to ensure maximum flexibility. Together with the amazing ultra-low power consumption of the SiM3Lxxx series, Silicon Labs' Precision3232-bit MCU series are available in many ARM Cortex- Stand out in the M3 MCU."

Patented Crossbar architecture ensures maximum flexibility

Crossbar is a patented technology from Silicon Labs. As shown in Figure 1 below, the Precision32 family consists of two Crossbars that can be connected to any I/O function to different pins. The benefit of this is obvious, it optimizes the layout, there is no pin conflict, and the peripheral function set can be customized (good for selecting low pin count MCUs).

Figure 2. Precision32 I/O crossbar – The Silicon Labs MCU includes two internal crossbars that allow any I/O function to be connected to different pins.

Designers can configure chip pins to simplify board design, such as configuring output pins close to the chip they are connected to. In some cases, this approach can even allow for the use of fewer wiring layer PCBs, resulting in cost savings. In addition, pin reconfiguration can easily handle the final board change problem.

This approach provides greater flexibility when selecting which features are connected to the pins and which are left floating. Flexibility is especially important when using small packages with a small number of I/O pins. Most other MCUs also provide some configuration, but may only support one or two functions on each pin, limiting the number of options and causing potential pin conflicts.

Users don't have to worry about the confusion that so many configurations can cause. The AppBuilder tool provides a graphical interface that allows designers to configure pins using drag and drop. Once configured, the tool can generate boot code that loads the configuration to the MCU. The tool works with commercial IDEs, including Keil and IAR, as well as popular Eclipse, which has been tuned to support Precision32 products.

A variety of innovative technologies to achieve ultra-low power 32-bit MCU

The Precision32 family uses a low-power Cortex-M3 core MCU comparable to an 8-bit MCU, and has a much more powerful performance, which is widely recognized by the industry as the preferred 32-bit MCU to replace the 8-bit MCU market.

In particular, the SiM3L1xx, which targets ultra-low-power battery-powered applications, reduces operating mode power consumption through a number of key innovations. For example, dynamic voltage regulation can adjust the voltage of the internal device according to the application. Compared to other 32-bit MCUs, its integrated high-efficiency DC-DC converter can reduce system power consumption by 40% and battery life by 60%! Its performance in sleep mode is even more impressive, with 5-10 times lower power consumption than its competitors (lowest sleep current can be as low as 50nA) and 33% lower power consumption in its operating mode.

Moreover, autonomous peripherals can operate without CPU intervention, and the Data Transfer Manager (DTM) does not require CPU intervention for complex data transfers; Enhanced Direct Memory Access (DMA) can reduce protocol-related power consumption by 90%, RAM and The register hold state can be quickly woken up within 4μs. The family of MCU products also features a patented LCD controller with a charge redistribution architecture that reduces power consumption by approximately 40% of the display without compromising performance.

In addition, the on-chip oscillator allows the CPU to run at any desired frequency; if an 8MHz external crystal is used, the MCU must run at a multiple of 8MHz. For the same reason, Silicon Labs allows the CPU and USB frequencies to be set independently, rather than a fixed ratio. This flexibility allows system designers to fine-tune the CPU frequency to provide the required performance while maintaining the lowest speed and power consumption.

Figure 3. Ultra-low power performance of the SiM3L1xx.

Silicon Labs also focuses on reducing system power consumption because many MCU applications are powered by batteries or by a limited level of USB specifications. For developers, integrating multiple dominant analog devices, such as oscillators and USB terminations, can reduce signal path length and integrate peripheral components, reducing overall system power consumption.

Development environment - faster, easier to use, perceived power, graphical

To simplify embedded application development based on the Precision32 family of products, Silicon Labs offers a rich set of hardware and software tools, including a unified development platform (UDP) with replaceable MCUs, RF components and other subsystems to accommodate a wide range of developers. Application requirements.

Developers can take advantage of the vast array of software and development tools optimized for the ARM architecture, including the Keil and IAR toolchain. To accelerate development and code migration between MCU platforms, Silicon Labs also offers Cortex Microcontroller Software Interface Standard (CMSIS) compatible code. The general-purpose peripheral ARM software interface allows peripheral drivers to be reused, simplifying code porting with other ARM-based microcontrollers.

Silicon Labs UDP hardware tools include the economical SiM3U1xx-B-DK and SiM3C1xx-B-DK development kits. The enhanced SiM3U1xx-B-EDK and SiM3C1xx-B-EDK development kits, with I/O expansion cards and additional presentation features, are designed to enhance the development experience.

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Figure 4: Precision32 complete toolkit reduces time to market.