【摘要】 AT8 9C2 0 5 1是一种高性能低价位单片机 ,但因其引脚少 ,给系统设计尤其是LED显示接口电路的设计带来一定难度。笔者采用串入并出移位寄存器 74LS16 4圆满地解决了这一问题 ,文中详细介绍了该接口电路的构成原理与软件。实际运行表明 ,该显示电路可以成功地应用到以AT89C2 0 5 1单片机为核心的智能仪表中 ,而且LED显示清晰稳定可在线调整发光亮度更多还原

【Abstract】 AT89C2051 is a single chip computer with high performance and low cost. Its LED displaying circuit is not easy to design, for there are a few numbers of pins. We solve this problem by using register 74LS164. This paper presents its principle and software implementation. It has been used successfully in the intelligent instrument with AT89C2051 chip, emitting steady light clearly and adjustable on line.更多还原