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样例使用说明
Sample Description
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功能描述：
此样例演示了使能LSE，
Function descriptions:
This example demonstrates enabling LSE and outputting LSE clock through MCO pin.
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测试环境：
测试用板：
MDK版本：
IAR版本：
GCC 版本：
Test environment:
Test board: PY32F403_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， ；
2. 可由示波器观察到PA08输出LSE波形。
Example execution steps:
1. Compile and download the program to the MCU.
2. Observe the LSE waveform on PA08 using an oscilloscope.
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注意事项：
Notes:
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