TMS320VC5402（VC5402）不具有可編程的非易失片內存儲器，必須外擴存儲程序代碼和參數的存儲器，在多數場合僅僅簡單的擴充此類存儲器會造成系統設計的繁瑣。利用AVR 單片機片內大容量的flash存儲器來存儲DSP 的程序和參數，使系統的整體設計更加緊湊，并彌補了VC5402 控制和通用通信功能的不足，這不失為一種有效的解決辦法。文中詳細分析了AVR 單片機（ATMEL64L）同VC5402 的HPI 接口通信硬件設計和DSP 程序代碼的加載方法。在通信軟件的設計方面著重闡述了通信協議和DSP 的bootloader實現方法。
關鍵字：AVR，主機接口，bootloader，數字信號處理器

Abstract:TMS320VC5402 (VC5402) doesn’t have programmable non-volatile memory, so it is necessary to expand non-volatile memory for saving program codes and parameters. In many applications, this architecture makes design complex. It is a good way that DSP program codes and parameters are saved in on-chip flash memory of AVR. So, the compacted design is achieved and the disadvantages of VC5402 on control and general communication functions are compensated. On the basis of analysis on VC5402 HPI interface, hardware design
of communication between ATMEL64L AVR and VC5402 HPI is provided. In the aspect of communication software design, communication protocol and DSP HPI bootloader are discussed in particular.
Keywords: AVR, HPI, bootloader, DSP CLC number：TP302