同步串行外设接口，它可以使MCU与各种外围设备以串行方式进行通信以交换信息。传输的数据为8位，在主器件产生的从器件使能信号和移位脉冲下，按位传输，高位在前，低位在后。,Synchronous serial peripheral interface, it can make the MCU with a variety of peripheral devices to communicate in order to exchange information in a serial manner. The transmission of data for eight master enable signal from the device and the shift pulse bitwise transmission, high front and low in the post.