介绍字符型LCD显示模块与单片机AT89C2051的接口技术，该接口技术基于数据的串行发送方式，它具有硬件电路简化、紧凑、可靠的特点，用途广泛。并给出在工程装备计时中的应用。关键词：液晶显示；单片机；接口技术；工程装备计时Abstract: The characteristics and work mechanism of both characters LCD and AT89C2051 are explained. The interface techniques of LCD block with AT89C2051are introduced. The technique makes the connection scheme easy and brief and the technique can be widely used in industry. The example of LCD block in the engineering equip time system are given also.Key words: LCD； single chip processor； interface technique; engineering equip time system