Parameters such as list price per unit, energy consumption, performance, form factor, operating systems required peripherals and so on to come into play. The final selection in choosing a CPU depends entirely on what is needed for that specific project. Until just a few years ago, it was easy to choose a CPU for embedded systems, but with Intel's return to the embedded scene with the Atom, the ARM processors now face strong competition in the market.
ARM still remains the preferred CPU architecture for a wide range of embedded systems and devices when it comes to energy consumption and performance in spite of Intel's revival. In particular, ARM has held on tentenaciously in consumer electronics such as mobile phones and PDAs, with a market share of over 90 percent. ARM processors are also starting to appear in small notebook devices.
The reason for ARM's dominance in small electronic products is simply the matter of energy consumption versus performance according to Gilad Mizrahi, hardware development manager for Data Respons Denmark. "An ARM-based system typically uses as little as 2 watts, whereas a full optimised Intel Atom solution uses 5 or 6 watts. This is incredibly significant for the battery lifetime in small mobile devices."
Another reason why ARM is so popular in small electronic devices is that one can reduce the solution,s total size much more with the ARM architecture than with x86 at the present time.
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