程序及操作指南：程序写入上电后，将在四个数码管上显示0000，然后每隔一分钟，数码管将从低位跳变，该程序模拟的就是时钟。用按键数显键可将时间调至正确时间。-procedures and operational guidelines : procedure into power, in possession of four digital display on the 0000, then every one minute of digital jump from the low, the pro