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                                样例使用说明
                             Sample Description
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功能描述：
此样例演示通过RTC秒中断从STOP模式下唤醒，唤醒后，小灯处于闪烁状态；否则处于熄灭
状态。

Function descriptions:
This sample demonstrates waking up the MCU from STOP mode using RTC second 
interrupt. After waking up, the LED will be in a blinking state. Otherwise, 
it will be turned off.
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测试环境：
测试用板：PY32F031_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: PY32F031_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；
2. 断开swd连接线并重新上电;
3. 等待LED灯亮后，按下用户按键，LED灯关闭，进入STOP模式；
4. 通过秒中断唤醒MCU后，LED灯闪烁。

Example execution steps:
1.Compile and download the program to the MCU;
2.Disconnect the SWD connection wire and power on again.
3.Wait for the LED to turn on, press the user button to turn off the LED 
and enter STOP mode;
4.After waking up the MCU through the second interrupt, the LED will blink.
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注意事项：
1，演示此样例功能时需要断开swd连接线并重新上电，因为默认情况下，仿真器会把
DBGMCU_CR.DBG_STOP置位。
2，注意关闭systick中断，防止该中断唤醒MCU。

Notes:
1.To demonstrate this sample functionality, disconnect the SWD connection and 
power cycle the board, as the debugger sets the DBGMCU_CR.DBG_STOP bit by default.
2.Make sure to disable the SysTick interrupt to prevent it from waking up the MCU.
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