1、功能说明
    1、STANDBY模式的进入和退出。

2、使用环境

    软件开发环境：KEIL MDK-ARM V5.34
                  IAR EWARM 8.50.1 
    芯片支持：
          N32H785
          N32H785EC
          N32H787
          
3、使用说明

    系统配置
    1、时钟源：HSI+PLL
    2、系统时钟频率：
        M7核:   600MHz  M4核:   300MHz
    3、唤醒源：
        WAKEUP按键-PA0
    4、打印：PB10 - baud rate 115200

    使用方法：
       1、将78x的GPIO的LedBlink demo和当前CM4的工程程序分别编译后下载到开发板并复位运行
       2、在KEIL下编译后烧录到评估板，串接电流表，上电后一段时间进入STANDBY模式，电流明显变小。按下WAKEUP按键，退出STANDBY模式，电流变大。
            如果开启打印输出，可以看到串口输出“CM4 Entry STANDBY mode”，唤醒后输出“--- CM4 Reset ---”，说明STANDBY唤醒后从0地址开始执行。

4、注意事项
    在评估功耗的时候，要注意去掉打印
    
1. Function description

    This example shows entry and exit of STANDBY mode.

2. Development environment

    Software development environment: KEIL MDK-ARM V5.34
                                      IAR EWARM 8.50.1 
    Supported chips:
          N32H785
          N32H785EC
          N32H787
          
3. How to use

    System Configuration:
    1. Clock source: HSI+PLL
    2. System Clock frequency:
       M7 core : 600MHz   M4 core:300MHz

    3. Wake-up source: 
        WAKEUP button-PA0
    4. printf: PB10 - baud rate 115200

     Instructions:
        1. Compile the LedBlink demo for 78x's GPIO and the current CM4 project program respectively, 
           then download them to the development board and reset to run；
        2. Compiled under KEIL and burned to the evaluation board, connected an ammeter in series, powered up and went into STANDBY mode for a while and the current became significantly lower. Press the WAKEUP button to exit STANDBY mode, and the current is back.
            If you turn on the printout, you can see that the serial port outputs "CM4 Enter STANDBY mode" and "----  CM4 Reset ----" after waking up, which means that STANDBY wakes up and starts executing from address 0..

4. Attention
    When evaluating power consumption, pay attention to removing the printf

