定时器进数码管显示，同按键的扫描一样，数码管的扫描可以使用延时的方式，也可以使用定时器来扫描，使用定时器的优势跟按键扫描部分一样，都是为了使CPU从机械的扫描中解脱出来去处理更多的任务。-Timer into the digital display, with key scanning, digital scanning delay can be used the way, you can also use the timer to scan, with the key advantages of using the timer part of the same scan, are intended to enable the CPU from mechanical scan freed to handle more tasks.