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 V5.25
    硬件环境：
        1、基于评估板N32L43XML-STB V1.0开发
        2、MCU：N32L436MBL7

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 V5.25
	Hardware environment:
		1. based on the evaluation board N32L43XML-STB V1.0 development
		2. MCU: N32L436MBL7

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. Matters needing attention
	None