高级多时段计时器，主要用于学校上下课的打铃、闹铃，您可以自己设置自己的铃声。 程序包内还附带了2种不同格式的 LED字体文件，均由本人修改而来，请将字体文件复制到系统字体文件夹内，能正常显示，现在拿出来与大家共享。-Advanced multi-period timer, mainly for schools, schools in the fight bell, alarm, you can set up your own ring tones. Inside the package al

微机接口课程设计实验报告,实验一：8255动态LED数码显示实验,实验二：8251串行接口实验,附程序清单-Computer Interface Designed curriculum experimental reports, one experiment: 8255 Dynamic LED digital display experiment two: 8251 serial interface experiments, attached to the list of procedures

This program, led on/o-This program, led on/off