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                                样例使用说明
                             Sample Description
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功能描述：
此样例演示了standby模式下，通过wakeuppin唤醒功能。

Function descriptions:
This sample demonstrates the wake-up feature using the wakeup pin in standby 
mode. 
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测试环境：
测试用板：PY32F420_STK
MDK版本： 5.28
IAR版本： 9.20
GCC版本：GNU Arm Embedded Toolchain 10.3-2021.10

Test environment:
Test board: PY32F420_STK
MDK Version: 5.28
IAR Version: 9.20
GCC Version: GNU Arm Embedded Toolchain 10.3-2021.10
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使用步骤：
1. 编译下载程序到MCU，断电并重新上电；
2. LED灯亮，按下按键，LED灯灭，进入standby模式；
3. 在PA07上产生一个上升沿，程序退出standby模式，LED闪烁5秒，然后被重新点亮。

Example execution steps:
1. Compile and download the program to the MCU, disconnect power, and then 
   power up again;
2. The LED will be on initially. Press the button, and the LED will turn off, 
   entering standby mode;
3. Generate a rising edge on PA07, and the program will exit standby mode. 
   The LED will blink for 5 seconds and then be turned on again.
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注意事项：

Notes:

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