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                                样例使用说明
                             Sample Description
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功能描述：
此样例演示了在TIM1输入捕获功能，PA8或PA9或PA10输入时钟信号，TIM1捕获成功后，
会进入捕获中断，每进一次中断，翻转一次LED。

Function descriptions:
This sample demonstrates the input capture function of TIM1. When a clock 
signal is input to either PA8, PA9, or PA10, TIM1 captures it successfully 
and enters the capture interrupt. With each interrupt, the LED will toggle.
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测试环境：
测试用板：PY32MD320_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: PY32MD320_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. 下载并运行程序；
2. PA8和PA10引脚不输入时钟信号的情况下，PA9引脚输入时钟信号，LED会翻转；
3. PA8和PA9引脚不输入时钟信号的情况下，PA10引脚输入时钟信号，LED会翻转；
4. PA9和PA10引脚不输入时钟信号的情况下，PA8引脚输入时钟信号，LED会翻转。

Example execution steps:
1.Download and run the program.
2.With no clock signal input to PA8 and PA10 pins, and only PA9 pin with a 
clock signal input, the LED will toggle.
3.With no clock signal input to PA8 and PA9 pins, and only PA10 pin with a 
clock signal input, the LED will toggle.
4.With no clock signal input to PA9 and PA10 pins, and only PA8 pin with a 
clock signal input, the LED will toggle.
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注意事项：
时钟主频为8M

Notes:
The system frequency is 8MHz.
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