说明：  本程序采用汇编编写，在单片机上实现时钟功能，具体：可以对4×5的键盘进行处理，可设置20个定时，并且对定时继续了排序。方便管理，还有闹钟设置。（原创）
(This procedure used to prepare a compilation, in SCM to achieve clock function, specific: Yes on 4 × 5 keyboard to carry out treatment, 20 can be set from time to time, and from time to time to continue the sort. Facilitate management, as well as alarm settings. (Original))