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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的外部时钟模式1功能，
更新中断，
Function descriptions:
This sample demonstrates external clock mode 1 function of the TIM1.Select the
ETR(PA12) pin as the external clock input source and enable the update interrupt
to flip the LED light in the interrupt.
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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. PA12引脚， ；
3. 可观察到MCU从PA12引脚上每检测到800个脉冲， ；
Example execution steps:
1. compile and download the program to MCU and run it;
2. Input external clock into PA12 pin;
3. It can be observed that every 800 pulses detected by the MCU from the PA12
pin, the LED light will be turned over once;
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注意事项：
Notes:
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