为解决小家电控制板设计过程中经常遇到单片机I/O口不够用的情况，文中以EM78P156N单片机的5个I/O口同时作为6个LED灯驱动和2个按键输入为例，给出了用较少的IO口实现多路驱动的方法-Small appliances control panel to address the design process often encountered in single-chip I/O port is not enough of the situation, the text to EM78P156N MCU 5 I/O ports at the same time as the six LED lamp driver and two keystrokes, for example, gives the IO ports with less-driven approach to achieve multiple