【摘要】 针对intel8279显示电路需要较多单片机I/O接口的缺点,本文提出采用MAX7219同时实现"米"型LED和8段数码LED混合显示的方法,并结出了显示电路和应用程序。本方法仅用单片机3根I/O接口,大大节省了硬件开支。更多还原

【Abstract】 According to the shortcoming that Intel8279 LED displaying circuit needs more I/O ports of single-chip microproces- sors,this paper presented a method to use MAX7219 to accomplish the mix displaying circuit of LED 16 segments and 8 seg- ments.Some application programs were also shown.Since only three I/O ports are needed in this system,the expenses of hard- ware are greatly saved in this method.更多还原