说明：  串行外设接口 <SPI>模块是一个同步串行接口,可用于与其他外设或者单片机进行通信。这些外设可以是串行EEPROM、移位寄存器、显示驱动器和A/D转换器等。SPI模块与Motorola的SPI和STOP接口兼容。
(The serial peripheral interface <SPI> module is a synchronous serial interface, which can be used to communicate with other peripherals or MCU.These peripherals can be serial EEPROM, shift register, display drive and A/D converter, etc.SPI module is compatible with Motorola's SPI and STOP interface.)