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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MSISYS，并通过MCO1（PA14）引脚输出。

Function descriptions:
This sample configures the system clock as HSISYS and outputs it through the 
MCO1 (PA14) pin.
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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. 编译下载程序到MCU，并运行；
2. 用示波器监测PA14引脚上的频率，观察到和配置的MSISYS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 PA14 pin and observes that
it matches the configured MSISYS frequency.
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注意事项：

Notes:

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