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                                样例使用说明
                             Sample Description
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功能描述：
此样例演示外部入侵事件擦除备份寄存器功能。在TAMP_IN引脚(PA8)产生下降沿入侵事件可
擦除备份寄存器中的数据。

Function descriptions:
This example demonstrates the function of erasing backup registers by 
external tamper events. A tamper event generated on the TAMP_IN pin (PA8) 
with a falling edge can erase the data in the backup registers.
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测试环境：
测试用板：PY32F090_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: PY32F090_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. 按下STK板的复位按键,LED灯亮起表明备份寄存器被成功写入特定的数据。
3. 在PA8产生一个下降沿事件，LED灯闪烁，表明产生了外部入侵事件且备份寄存器中数据被
成功擦除。

Example execution steps:
1. Compile and download the program to the MCU.
2. Press the reset button on the STK board, and the LED lights up to indicate 
that the backup registers have been successfully written to specific data.
3. A falling edge event is generated at PA8 and the LED blinks to indicate 
that an external intrusion event has been generated and the data in the 
backup register has been successfully erased.
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注意事项：

Notes:

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