Introduction - If you have any usage issues, please Google them yourself
Cortex-M3 is the first based on ARMv7-M processor architecture, is designed for in microcontrollers, automotive body systems, industrial control systems and wireless networks such as power consumption and cost-sensitive embedded applications to achieve high system performance and design, it greatly simplifies the complexity of programmable, so that ARM architecture has become a wide range of applications programs (even the most simple program) a good choice.
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ARM-Cortex-M3-cn.pdf