假定8051单片机P1端口外接矩阵式键盘，矩阵式键盘的列线（Y0-Y3）姐单片机P1.0-P1.3，而行线（X0-X3）接P1.4-P1.7。P2.0接发光二极管。根据键值的大小使发光二极管闪烁相应的次数。-

8051 P1 port assumed external matrix keyboard, matrix keyboard column line (Y0-Y3) sister SCM P1.0-P1.3, while southbound (X0-X3) received P1.4-P1.7. P2.0 connected light-emitting diodes. According to the size of the key to make the appropriate number of LED flashes.