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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 (Power Voltage Detector) voltage detection 
function. It configures PB07 pin to compare its voltage with VREF (1.2V). 
When the voltage of PB07 exceeds VREF, the LED turns off. When it is lower 
than VREF, the LED lights up.
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测试环境：
测试用板：PY32MD420_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: PY32MD420_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，并运行；
2. PB07输入0V时，进入PVD中断，LED灯亮，PB07悬空时（内部上拉相当于接入3.3V）LED灯
灭；
3. 再次输入0V，LED灯亮。

Example execution steps:
1.Compile and download the program to the MCU and run it.
2.When PB07 is set to 0V, it triggers the PVD interrupt and the LED lights up. 
When PB07 is floating (internally pulled up to 3.3V), the LED turns off.
3.Set PB07 to 0V again, and the LED lights up.
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注意事项：

Notes:

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