PC - MCU 串行通迅程序 * * 单片机接收主机的数据,然后将数据传送到P0口, 并传回给主机 * * 当按下AN1时, 单片机发送字串"welcome! www.willar.com \n\r" * * 给主机.-PC- MCU Serial communication procedures** Singlechip receiving host data, and then data to P0 mouth, and returns to the host AN1** Wh