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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PVD电压检测功能。样例中配置PB07引脚的电压与VREF（1.2V）进行比较。
当PB07引脚的电压高于VREF时，LED灯灭；当低于VREF时，LED灯亮。

Function descriptions:
This sample demonstrates the PVD (Programmable Voltage Detector) voltage 
monitoring functionality. In this example, PB07 pin is configured to compare 
its voltage with VREF (1.2V). When the voltage at PB07 is higher than VREF, 
the LED light turns off. When it is lower than VREF, the LED light turns on.
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测试环境：
测试用板：PY32F040EP_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: PY32F040EP_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. 编译并下载程序到MCU，并运行。
2. 将PB07引脚输入0V时，进入PVD中断，LED灯亮。将PB07引脚悬空时（内部上拉相当于
   接入3.3V），LED灯灭。
3. 再次将PB07引脚输入0V，LED灯亮。

Example execution steps:
1. Compile and download the program to the MCU and run it.
2. When the voltage at PB07 pin is 0V, it triggers the PVD interrupt and the 
   LED light turns on. When the PB07 pin is left floating (internally pulled up 
   to 3.3V), the LED light turns off.
3. Repeat step 2 by inputting 0V to the PB07 pin. The LED light turns on.
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注意事项：
如果需要使用按键:
StartKit版本为V1.0,需将StartKit.h中的StartKitVersion 2 注释掉，并打开
StartKitVersion 1
StartKit版本为V1.0以上版本,则无需操作

Notes:
If you need to use buttons:
StartKit version is V1.0, please comment out StartKitVersion 2 in StartKit.h and 
open StartKitVersion 1
If the StartKit version is above V1.0, no operation is required
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