目录电感和磁珠的联系与区别...............................................................................................................4片式磁珠和片式电感的应用场合...........................................................................................5贴片电容..........................................................................................................................................6贴片电阻..........................................................................................................................................7DDRSDRAM....................................................................................................................................8射频..................................................................................................................................................9看门狗定时器..................................................................................................................................9DMA直接内存访问........................................................................................................................9DMA工作原理......................................................................................................................10RTC实时时钟................................................................................................................................10I2C总线..........................................................................................................................................101I2C总线特点.......................................................................................................................112I2C总线工作原理...............................................................................................................113I2C总线基本操作...............................................................................................................11I2S总线..........................................................................................................................................12I2S总线规范..........................................................................................................................12串行数据(SD)...................................................................................................................12字段(声道)选择(WS)...................................................................................................13时序要求:.............................................................................................................................13I2S总线结构配置..................................................................................................................13SSP和USTART.............................................................................................................................14SPI串行外设接口错误!未指定文件名。..................................................................................14SPI接口内部硬件图示:......................................................................................................15MMC多媒体卡..............................................................................................................................15MMC卡简介..................................................................