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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 the monitoring equipment circuit design, the keyboard and display need to take up a lot of MCU hardware and software resources for the MCU to extend the serial communication driver chip can be a better solution to such problems. Combined with the embedded microcontroller LPC2148, the serial keyboard display driver CH451 is used to design the corresponding interface circuit and software driver and management program. It can realize 8-bit LED display and 64-bit keystroke, and the interrupt mode can quickly respond to the external keyboard interrupt. Circuit is simple, high efficiency, can be used for general industrial monitoring equipment circuit design and application.