用7279模块和单片机连接，实现用数码管显示时钟和年份，用按键来分别确定时间显示和年份显示，时间和年份均可通过按键调节。-Connection with the 7279 module and microcontroller to achieve with a digital LED display clock and year, respectively, with the keys to determine the time display and the year shows that t