为低成本实现与广告灯箱同步发声功能,设计了一种基于C8051F020和CF卡的有声灯箱控制器.本文在给出系统设计方案基础上,着重介绍几个关键问题:给出C8051F020和CF卡的接口电路;解决不同容量CF卡格式化为FAT文件系统时隐藏扇区的问题;以快速读取CF卡数据、双缓冲、有限状态机等组合技术解决了声音播放不连续的问题.该系统运行可靠,其设计合理、实用. In order to realize the function of synchronizing the sound with the advertising light box at low cost, an audio light box controller based on C8051F020 and CF card is designed.This paper gives some key problems on the basis of system design, and gives some key problems: C8051F020 and CF card Interface circuit to solve the problem of hiding sectors when formatted as FAT file system with different capacities of CF card and solve the problem of sound playing discontinuity by fast reading CF card data, double buffering and finite state machine, etc. The system runs Reliable, its design is reasonable and practical.