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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TIM1的三通道异或输入捕获功能。配置PA8、PA9、PA10为通道1、通道2、通道3
的输入引脚。每当有一个引脚电平变化时会触发捕获中断，
Function descriptions:
This sample demonstrates the XOR input capture functionality of TIM1 using three
channels: PA8, PA9, and PA10 as the input pins for channel 1, channel 2, and
channel 3, respectively. Whenever there is a change in the level of any of the
input pins, it triggers the capture interrupt and toggles the LED in the
interrupt handler.
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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. PA8/PA9/PA10保持任意两个引脚电平不变，
Example execution steps:
1.Compile and download the program to the MCU, and then run it.
2.Keep the level of any two pins(PA8/PA9/PA10) unchanged, and when the level of the
remaining pin changes, the LED will toggle.
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注意事项：
Notes:
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