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K1=P3.2 时, 单片机发送字www.hificat.com" 给主机-The host microcontroller to receive data, then data to the P0 port, and returns to the host When you press K1 = P3.2, the MCU sends word www.hificat.com " to the host