摘要
在监控设备的电路设计中,键盘和显示需要占用MCU大量的硬、软件资源,为MCU扩展串行通信驱动芯片可以较好地解决此类问题。结合嵌入式微控制器LPC2148,采用串行键盘显示驱动芯片CH451,设计相应的接口电路和软件驱动与管理程序,可以实现8位LED显示、64位按键,中断方式快速响应外部键盘中断。电路简单、运行效率高,可用于一般工业监控设备的电路设计与应用。
In circuit design of controlling equipments,a great deal of hardware and software resources of MCU is occupied for the keyboard and display. In order to solve this problem, extending a serial communication drive chip to the MCU should be used. Based on an embedded microcontroller LPC2148,1inked with a serial keyboard / display interface chip CH451, the interface electric circuit is designed,its drive programmer is developed. An 8 LEDs and 64 keys function could be realized. Adopting external interrupt mode could quickly respond the key pressed. This circuit is simple and high - efficiency. It can be applied to the design and application for the control equipment circuit in industry.
出处
《现代电子技术》
2007年第18期67-69,共3页
Modern Electronics Technique
