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General-Purpose MCUs

Across a number of microcontroller applications, ARM is seeing an increased need for more performance, either due to increased algorithm complexity, integration of multiple, discrete MCU systems into a single entity or the inclusion of wireless/wired connectivity. ARM's focus on minimizing system cost is blurring the traditional "8-bit MCU is for low cost, 32-bit MCU is for performance" point of view. The rapid growth of the 32-bit controller market, coupled with ARM efforts to standardize low level software libraries further accelerates the availability of software libraries optimized for use on the Cortex-M family of embedded processors, reducing the learning curve for new microcontroller developers and improving time to market for new devices.
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Three major trends are shaping the MCU space

  1. Algorithms are increasing in complexity. For example, the desire to make motors more power efficient pushes up the CPU performance requirements.
  2. Consolidation of multiple subsystems into a single electronics board, to reduce system cost, footprint and power
  3. Platforms once closed are starting to include wired and/or wireless connectivity. This puts further pressures on processor performance requirements and provides additional challenges to the system designer to ensure high degrees of system security/reliability and embed enough latent performance to support future services that maybe delivered across the network to deployed platforms

The combination of these three factors will cause the 32-bit MCU market to grow at a rate that far outpaces the growth of other sub-segments of the MCU market and indeed the market overall.


In July 2009, information technology research company Gartner Inc issued an update that indicated that the ARM® architecture held the largest market share of the 32-bit MCU market and that this architecture was the fastest growing area of the 32-bit market. Why is this happening and why is this important?

Fundamentally, it comes down to choice, reduced development costs and aggressive system pricing. The rapid adoption of ARM technology in the MCU space increases the amount of application software and development tools optimized for the ARM architecture, which in turn simplies the job for the system designer since their engineering team can focus on key areas of system differentiation.

In these tough economic times, customers are looking to invest in one architecture and then leverage that investment as broadly across their portfolio of systems for as long into the future as possible. The diverse set of silicon devices, based on a standard MCU processor core enables OEM customers to select the device and vendor that best addresses their requirements, safe in the knowledge that they are not locked into a particular supplier.

The integration of a 32-bit processor can seem like a daunting task for companies that have previously used 8-bit microcontrollers or indeed have only designed analog circuits in the past. ARM provides a number of physical IP packages, optimized for use at the traditional process nodes used for microcontrollers including 250nm, 180nm and 90nm, that simplify the design of the silicon chip. They offer high performance and low power kits to provide a quick time to market for silicon designers wishing to extract maximum performance and/or power benefits with minimum use of internal design resources


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