1. Function description

This example demonstrates the LSE CSS processing flow
    

2. Use environment

Software development environment: KEIL MDK-ARM Professional Version 5.26.2.0

        Hardware environment: NS3602_SOCKET_LQFP48_V1.0


3. Instructions for use

The system clock configuration is as follows:
    - Clock source = HSE + PLL
    - System Clock = 108MHz
    
    Print the USART configuration as follows:
    - Baud rate = 115200 baud
    - Word length = 8 data bits (fixed)
    - 1 stop bit (fixed)
    - checksum control disabled
    - Hardware flow control disabled (RTS and CTS signals)
    - Receiver and transmitter enable

    Print the USART pin connections as follows:
    - Tx.PA9
    - Rx.PA10
    
    The LPUART configuration is as follows:
    - Baud rate = 9600 baud
    - Word length = 8 data bits (fixed)
    - 1 stop bit (fixed)
    - checksum control disabled
    - Hardware flow control disabled (RTS and CTS signals)
    - Receiver and transmitter enable
    
    
    The LPUART pins are connected as follows:
    - LPUART_Tx.PB10
    - LPUART_Rx.PB11

    
    Test steps and phenomena:
    - Demo is compiled in KEIL environment and downloaded to MCU
    - reset operation, view serial port printing information


4. Matters needing attention