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  ******************************************************************************
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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Version history:
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2023-06-16	V1.00	AE TEAM

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Demo introduction:
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本示例功能：简易的HRC4M软件温漂修正方案。
            每500ms修正一次，可使全温度环境下HRC4M频率偏差在±1%以内。

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测试环境:
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测试用板：
ES-PDS-ES32VF2264

辅助工具：
高低温箱

辅助软件：
无

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测试步骤：
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1) 编译工程，编译通过后将程序下载到目标芯片，运行程序；
2) 将程序配置的HSCO对应的引脚连接至示波器相应管脚，观察系统时钟128分频后输出的波形；
3) 将芯片放置于高低温箱进行测试，调节温度，观察HSCO输出的波形频率。

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注意：
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1.ADCREFP是实际参考电压值，单位mV，需要根据实际情况设定，误差不超过±2%。
以本例程为例，ADC参考电压选择VDD，VDD为3.3V，则程序应设定ADCREFP为3300。

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System clock:
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HRC4M PLL 48MHz

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Pin connection: 
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HSCO ---- PA8[GPIO_FUNC_4]
