TI公司的TMS320VC54x DSP由于具有实时处理能力、低功耗、高性价比等优势，广泛应用于各种嵌入式信号处理产品中，而键盘和显示电路作为人机交互的一部分也是嵌入式系统中不可缺少的组成，本文介绍一种新的基于TMS320VC5416的键盘显示扩展设计方案，利用HD7279A键盘扩展芯片，仅占用DSP的2个IO口和1个中断，能实现64键键盘和64路LED的控制。方案简单易于实施，实际使用效果良好。-Since TI' s TMS320VC54x DSP real-time processing capability, low power, high cost and other advantages, are widely used in a variety of embedded signal processing products, while the keyboard and display circuit as a part of human-computer interaction is indispensable in embedded systems The composition, this paper presents a new show based on TMS320VC5416 extended keyboard design, using the keyboard extended HD7279A chips, only with the DSP-2 IO ports and an interrupt, can achieve 64-key keyboard and 64-way LED control. The program simple and easy to implement, the actual use of good results.