串口通讯测试，含串口调试程序，直接烧写进89S52芯片即可 插上串口线 在电脑中打开串口调试程序 设置好串口号 1200波特率 就可以看到结果了 晶振12M。-Serial communications testing, including serial debugger, burned into the 89S52 chip can directly plug in the computer, open the serial line serial debugger set 1200 baud