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代码说明：

说明：  串口通讯实验： 本实验得到的结果为，打开超级终端，设置波特率为115200，数据流控制位为无。运行系统，就会显示“UART & Interrupt Experiment,Please Input from the keyboard”，我们就可以通过写串口操作。 在flash调试时，需要修改RO BASE为0x00000000，其他不用修改，重新编译下载就可运行。 注意：由于系统产生中断，程序计数器就会跳到0x18处执行中断服务子程序，所以不能在SDRAM调试。 (Serial communication experiment: the results of this experiment, open HyperTerminal, set the baud rate to 115200, data flow control bit is not. Operating system, it will display " UART & Interrupt Experiment, Please Input from the keyboard" , we can write the serial port operation. Debug in flash, you need to modify the RO BASE is 0x00000000, the other not modify, recompile download can run. Note: Due to system interrupt, the program counter will jump to 0x18 Department execute the interrupt service routine, it can not debug the SDRAM.)