单片机MSC51设计的5个源程序：1、数据排序2、多功能数字钟设计3、P1口循环亮灯设计4、脉冲计数器5、8250芯片串口扩展。另附程序详细介绍。

-microcontroller design MSC51 five sources : 1, 2 ranking data, multi-function digital clock design 3, I P1 lighting design cycle 4, pulse counter 5, 8250 chip serial expansion. Followed by procedures detailed briefing.