DSP是當今主要的用于數字信號處理的嵌入式平臺，隨著嵌入式應用的日益廣泛和加深越來越多的工作需要DSP芯片與PC機的協同工作，然而DSP芯片往往不能提供足夠的URAT接口，因此就需要利用URAT芯片來擴展DSP芯片串口。本文主要討論了利用TI公司的異步通用接收發器TL16C550擴展DSP串口，實現TMS320C5509與PC機之間的串行通信。本文同樣介紹了異步通用接收發器芯片TL16C550的寄存器和相應功能，并且提供了利用TL16C550實現TMS320C5509與PC機串行通信的硬件電路和C語言實現軟件編程方法。

Abstract:

?DSP is a popularly control method which was mainly used in the embedded type system. With the development of embedded type ，the DSP connecting with PC is become more and more important. However， the DSP chip usually can’t offer the sufficient URAT interface ，so it became necessary to use URAT chip to expand DSP interface. This paper discussed the realization of serial communication between the TMS320C5509 and PC based on TI URAT chip TL16C550， introduced the URAT chip TL16C550’s register and corresponding function， and also provided hardware circuit which realized the serial communication bettween TMS320C5509 and PC by using TL16C550 and software programed by C language.

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