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[BSP][stm32f411-nucleo] Update README.md file.

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Bernard Xiong 2018-05-29 10:26:54 +08:00
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## 1. 简介
STM32F411-nucleo 是由意法半导体推出的搭载Cortex-M4内核的高性能微控制器开发板，包括如下硬件特性：
[STM32F411-nucleo](http://www.st.com/resource/en/data_brief/nucleo-f411re.pdf) 是由意法半导体推出的搭载Cortex-M4内核的高性能微控制器开发板，包括如下硬件特性：
| 硬件 | 描述 |
| -- | -- |
|芯片型号| STM32F411RE |
|芯片型号| [STM32F411RE](http://www.st.com/en/microcontrollers/stm32f411re.html) |
|CPU | Cortex-M4 |
|主频 | 100MHz |
|Flash| 512kB |
|SRAM | 128KB |
![stm32f411](http://www.st.com/content/ccc/fragment/product_related/rpn_information/product_circuit_diagram/4b/82/41/cc/25/ec/4b/3d/bd_stm32f411xe_512k.jpg/files/bd_stm32f411xe_512k.jpg/_jcr_content/translations/en.bd_stm32f411xe_512k.jpg)
## 2. 编译说明
| 环境 | 说明 |