文件名称:l_key
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键盘程序,本程序涉直接采用分时扫描法，将读到的键值直接输出P2口，在LED灯显示，
此程序也将直观看到每个按键所对应的键值了，都从LED表现出来，这是学习矩阵键盘的关键-Keyboard program, this program involving direct scanning method, will read the key value directly to the output port P2, the LED light display,
此程序也将直观看到每个按键所对应的键值了，都从LED表现出来，这是学习矩阵键盘的关键
This program will also see visually corresponding to every key press, is expressed in LED, which is the key to learning the keyboard matrix
此程序也将直观看到每个按键所对应的键值了，都从LED表现出来，这是学习矩阵键盘的关键-Keyboard program, this program involving direct scanning method, will read the key value directly to the output port P2, the LED light display,
此程序也将直观看到每个按键所对应的键值了，都从LED表现出来，这是学习矩阵键盘的关键
This program will also see visually corresponding to every key press, is expressed in LED, which is the key to learning the keyboard matrix
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l_key.c
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