此五个源代码是关于单片机应用的。依次为：串行通信中利用中断方式收发数据；矩阵键盘中逐行扫描法的应用；利用定时器T0查询方式控制P0口八位LED灯闪烁；利用定时器T0中断方式控制数码管动态显示0-999；利用外部中断计数并让数码管显示此数值。-Five of this source code on the microcontroller applications. As follows: serial communication send and receive data interrupt t

矩阵键盘，共有4行，4列，4行分别接P3.0-P3.3，4列分别接P3.4-P3.7 功能：采用扫描法，通过按键在1602液晶上显示相应的数字 -Matrix keyboard, a total of 4 lines, 4, 4 lines respectively connected to P3.0-P3.3, 4 columns to pick P3.4-P3.7 functions: scanning method, through the keys in 1602 th

矩阵键盘识别，通过扫描法，先扫描行再扫描列，最后得到按键的位置-Matrix keyboard identification, through scanning, the first scan line and then scan the column, and finally get the location of keys

单片机，通过串行扫描，读取矩阵的键盘码。-Microcontroller reads the keyboard codes.