本人初学者，只是有限，难免有些地方让人笑话，望指正。这是一个单片机时钟程序，实现的功能有：时间显示、闹钟、倒数 -I am a beginner, but limited, inevitable that some people joke, hope the correction. This is a single-chip clock procedures, functions: time display, alarm clock, countdown