用电平开关的输出作为中断源，每个开关对应于一个中断源。在中断服务程序中，通过74LS273输出一个数据，以点亮与中断源相对应位置的LED。-The output power level as the interrupt source switch, each switch corresponds to an interrupt source. The interrupt service program, a data output through the 74LS273 to light corresponds with the position of the interrupt source LED.