16键码显示的程序,我们在P1端口接一支共阴数码管SLED，在P2、P3端口接16个按键，分别编号为KEY_0、KEY_1到KEY_F，操作时只能按一个键，按键后SLED显示对应键编号。-16 key code shows the procedure, we take a total of P1 port overcast digital tube SLED, at P2, P3-port access button 16, respectively, numbered KEY_0, KEY_1 to KEY_F, in operation only the press of a button after button SLED shows the corresponding number keys.