说明：  no intro
(Quartus II software by means of experimental Lee designed a multi-functional digital clock and realized the school, the school hours, cleared, and the whole point of time keeping and other basic functions, in addition to achieve the alarm clock, week, music, alarm, etc. Additional function. This paper carried out using Quartus II schematic design and simulation debugging, and finally verified in the experimental board design is correct. Keywords: digital clock alarm clock simulation of quasi-point of time)