用P1口，一位接按键输入，四位接LED输出显示一个四位二进制数，每次按键，二进制数加1 P1口用4*4键盘输入，P0口接1位数码管显示16个键，分别显示0—F 实现一位十进制计算器功能-with P1, an access key input, then four LED output showed a binary number four, each button. plus a few binary P1 mouth 4* 4 keyboard input, P0 I receive