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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唤醒定时器中断每隔1s将MCU从STOP0模式下唤醒，每次唤醒会翻转LED，
LED翻转间隔为1s。

Function descriptions:
This example demonstrates waking up the MCU from STOP0 mode every 1 second 
using an RTC WakeUpTimer interrupt. Each wake-up will flip the LED, with 
an interval of 1 second between LED flips.
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测试环境：
测试用板：PY32L090_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: PY32L090_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STOP0模式；
4. RTC开始计时，唤醒定时器中断每隔1s唤醒一次MCU，并且翻转LED。

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 light up, press the user key, the LED turns off 
and enter STOP0 mode;
4. the RTC starts timing, the WakeUpTimer interrupt wakes up the MCU 
every 1s and flips the LED.
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注意事项：

Notes:

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