1、功能说明
    1、通过EXTI线来触发日历打印输出。

2、使用环境

    软件开发环境：KEIL MDK-ARM V5.34
                  IAR EWARM 8.50.1

    硬件开发环境：
        N32H473系列：
        基于评估板N32H473VEL7_STB V1.0开发
        N32H474系列：
        基于评估板N32H474VEL7_STB V1.0开发
        N32H475系列：
        基于评估板N32H475UEQ7_STB V1.0开发
        N32H482系列：
        基于评估板N32H482ZEL7_STB V1.0开发
        N32H487系列：
        基于评估板N32H487ZEL7_EVB V1.1开发


3、使用说明
    
    系统配置:
        1、RTC时钟源：LSE
        2、中断线：EXTI_LINE7
        3、串口配置：
                            - 串口为USART1（TX：PA9  RX：PA10）:
                            - 数据位：8
                            - 停止位：1
                            - 奇偶校验：无
                            - 波特率： 115200 
    使用方法：
        编译后烧录到评估板，PC13连接到PA7口，上电后，串口每隔1S会打印一次对应日历时间

4、注意事项
    无


1. Function description

    1. Trigger calendar printout through EXTI line.

2. Use environment

    Software development environment: KEIL MDK-ARM V5.34
                                      IAR EWARM 8.50.1

    Hardware development environment:
        N32H473 series:
        Developed based on the evaluation board N32H473VEL7_STB V1.0
        N32H474 series:
        Developed based on the evaluation board N32H474VEL7_STB V1.0
        N32H475 series:
        Developed based on the evaluation board N32H475UEQ7_STB V1.0
        N32H482 series:
        Developed based on the evaluation board N32H482ZEL7_STB V1.0
        N32H487 series:
        Developed based on the evaluation board N32H487ZEL7_EVB V1.1

3. Instructions for use

    System configuration:

        1. RTC clock source: LSE
        2. EXTI line: EXTI_LINE7
        3. Serial port configuration:

                            - Serial port: USART1 (TX: PA9 RX: PA10) :
                            - Data bit: 8
                            - Stop bit: 1
                            - Parity check: None
                            - Baud rate: 115200

    Instructions:
        After compilation, it is burned to the evaluation board. PC13 is connected to PA7 port. After power-on, the serial port prints the corresponding calendar time every 1S

4. Attention
    None