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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COMP比较器唤醒功能，PC2作为比较器正端输入，PC3作为比较器的负端输入，
进入stop模式后，通过调整PC2上的输入电压，产生中断唤醒stop模式。

Function descriptions:
This example demonstrates the COMP comparator wake-up function, where 
PC2 serves as the positive input of the comparator and PC3 as the negative input,
After，entering stop mode, the interrupt wake-up stop mode is generated by adjusting
the input voltage on PC2.
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测试环境：
测试用板：PY32F420_STK
MDK版本： 5.41
IAR版本： 9.20
GCC 版本：GNU Arm Embedded Toolchain 10.3-2021.10

Test environment:
Test board: PY32F420_STK
MDK Version: 5.41
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. PC3输入1.65V；
3. LED亮起后按下按键，进入stop模式，LED熄灭；
4. 在PC2上输入从小于1.6V到的大于1.7V电压时，产生中断，LED点亮1s；
5. 接下来LED每隔200ms进行翻转，程序正常运行。

Example execution steps:
1.Compile and download the program to MCU and run it;
2.PC3 input 1.65V
3.After the LED lights up, press the button to enter the stop mode, and the
LED goes out;
4.When inputting a voltage from less than 1.6V to greater than 1.7V on PC2, an
interrupt is generated and the LED lights up for 1 second;
5. Next, the LED flips every 200ms and the program runs normally
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注意事项：

Notes:

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