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                                样例使用说明
                             Sample Description
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功能描述：
此样例配置系统时钟为HSI，并通过MCO（PA08）引脚输出。

Function descriptions:
This sample configures the system clock as HSI and outputs it through the MCO 
(PA08) pin.
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测试环境：
测试用板：PY32T020_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: PY32T020_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，并运行；
2. 用示波器监测PA08引脚上的频率，观察是否和配置的HSI频率一致。

Example execution steps:
1. Compile and download the program to the MCU and run it.
2. Use an oscilloscope to monitor the frequency on the PA08 pin and check if it 
   matches the configured HSI frequency.
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注意事项：

Notes:
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