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    1TIM2 øжϣʱתIO
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      KEIL MDK-ARM V5.26.2.0
    Ӳ      N32L40XM-STB_V1.0
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            HSE=8M,PLL=64M,AHB=64M,APB1=16M,APB2=32M,TIM2 CLK=32M
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            TIM2 жϴ򿪣ȼ0ȼ1
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            PC6ѡΪIO
            PC7ѡΪIO
            PC8ѡΪIO
            PC9ѡΪIO
        4TIM
            TIM2ʹж
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        1򿪵ģʽʾ߼ǹ۲PC6Ĳ
        2кTIM2жٷתPC6ƽ
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1. Function description
     1. TIM2 uses the update interrupt to generate timing rollover IO
2. Use environment
     Software development environment: KEIL MDK-ARM V5.26.2.0
     Hardware environment: Developed based on N32L40XM-STB_V1.0
3. Instructions for use
     System Configuration;
         1. Clock source:
             HSE=8M,PLL=64M,AHB=64M,APB1=16M,APB2=32M,TIM2 CLK=32M
         2. Interruption:
             TIM2 update interrupt is on, steal priority level 0, sub priority level 1
         3. Port configuration:
             PC6 is selected as IO output
             PC7 is selected as IO output
             PC8 is selected as IO output
             PC9 is selected as IO output
         4. TIM:
             TIM2 enables periodic interrupts
     Instructions:
         1. After compiling, turn on the debug mode, and use the oscilloscope or logic analyzer to observe the PC6 waveform
         2. After the program is running, the periodic interrupt of TIM2 comes to flip the PC6 level
4. Matters needing attention
     without