DM642和CPLD外部中断的寄存器式键盘设计

Register Keyboard Based on External Interrupt of DM642 and CPLD

介绍了一种采用DM642和CPLD相配合的扩展键盘方法。CPLD管理键盘电路中的芯片逻辑,DM642的外部中断监控按键的状态。简单阐述了键盘的分类,给出系统的硬件电路原理图,在CCS软件中调试程序方法。仿真结果表明,设计可行,达到了预期效果。

This paper introduces a method based on DM642 and CPLD to expand keyboard. CPLD manages chip logic of the keyboard electric circuit, and DM642 external interrupt monitors states of the button. The types of the keyboards are expatiated on. System hard ware electric circuit principle diagram is depicted, and programs are debugged in the CCS software. Simulation results show the design is feasible and achieves the desired results.