TMS320VC5402（VC5402）不具有可编程的非易失片内存储器，必须外扩存储程序代码和参数的存储器，在多数场合仅仅简单的扩充此类存储器会造成系统设计的繁琐。利用AVR 单片机片内大容量的flash存储器来存储DSP 的程序和参数，使系统的整体设计更加紧凑，并弥补了VC5402 控制和通用通信功能的不足，这不失为一种有效的解决办法。文中详细分析了AVR 单片机（ATMEL64L）同VC5402 的HPI 接口通信硬件设计和DSP 程序代码的加载方法。在通信软件的设计方面着重阐述了通信协议和DSP 的bootloader实现方法。关键字：AVR，主机接口，bootloader，数字信号处理器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 designof 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