When some microprocessors working with USB equipments in embedded systems without their own USB controller, their USB interface must be expanded.
对于多款微处理器本身没有USB的控制器，为了在嵌入式系统中使用USB设备，需要自行扩展usb接口。
The status and function of the LCD controller in the embedded system, and the liquid crystal displayer's interface signal's definition and function are introduced.
介绍了液晶显示控制器在嵌入式系统设计中的地位和作用，液晶屏接口信号的定义及作用。
Then mainly expatiates RTL8019AS Ethernet controller driver and serial interface driver of embedded communication platform; Finally, discusses the application program development and driver testing.
然后重点阐述了嵌入式通信平台RTL8019AS以太网控制器和串口驱动程序的设计方法，并分析了驱动程序的调试方法；
Then mainly expatiates RTL8019AS Ethernet controller driver and serial interface driver of embedded communication platform; Finally, discusses the application program development and driver testing.
然后重点阐述了嵌入式通信平台RTL8019AS以太网控制器和串口驱动程序的设计方法，并分析了驱动程序的调试方法；
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