| With the development of network era, Internet has become the most important foundational information establishment, so more and more devices need to be connected in Internet, but the solutions for such devices as embedded microprocessor vary a lot. The solution for connecting the eight-bit micro-controller and tidy TCP/IP protocol stack in Ethernet, which are selected according to the specification of the device, is described in detail in this thesis. We designed the framework which could be used for most embedded devices and introduce the hardware and software of the system. Problems which should be paid special attention to when designing the hardware is also written up. In order to increase reliability of the system and ensure the well running of, μC/OS-Ⅱ is introduced during software designing. In this paper, we describe the task scheduler mechanism of the realtime operating system uC/OS- II and discuss the problems which we can meet in transporting OS to W78E516, how to embed the TCP/IP protocol stack in μC/OS-Ⅱ in detail. Lastly, the realization of all layers of TCP/IP protocol stack, interface functions, flowin&flowout mechanism of data pack are described particularly.After several months' design and test of hardware and software, we gain our ends. This project is a good refrence for connecting embedded device in Internet in many fields, and it establishes a good foundation on this technology.
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