说明：  CAN、I2C、SPI、PCI总线简介，串行外围设备接口SPI（serial peripheral interface）总线技术；CAN 是一种多主方式的串行通讯总线；I2C规程运用主/从双向通讯。
(Brief introduction of CAN, I2C, SPI, PCI bus, SPI serial peripheral interface (serial peripheral interface) bus technology CAN is a multi master serial communication bus I2C rules using the master/slave two-way communication. )