Update 15.TencentOS_tiny_EVB_MX+_quick_start.md
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@@ -15,17 +15,29 @@ EVB_MX+是腾讯物联网操作系统TencentOS tiny 团队联合南京厚德物
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### 1.2 开发板特性
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**CPU** :STM32L431RCT6, 80MHz,256K Flash,64KB SRAM
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**显示屏** :OLED,128*32分辨率
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**电源特性** :Micro USB接口,5V供电,内部有5V转3.3V的DCDC,MCU供电电压为3.3V,系统IO电压也为3.3V
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**按键** :一个复位按键,四个功能按键
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**外部扩展存储** :SPI FLASH,TF卡
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**LED指示灯** :上电指示 LED,红色;充电指示 LED,红色;一个用户定义LED,蓝色
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**调试接口** :SWD外接ST-Link,UART2串口连接PC
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**XTAL** :8MHz,32.768KHz
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**传感器扩展接口E53 Interface** :支持E53传感器案例扩展板(支持UART、SPI、IIC、GPIO、ADC、DAC等)
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**网络模块扩展接口WAN Interface** :支持多种无线通信模组扩展(UART&SPI&GPIO)
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**操作系统支持** :TencentOS tiny
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### 1.3 开发板硬件详解
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#### 1.3.1 电源电路
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