一款玩具产品，通过中断来检测按键，控制灯，产生方波驱动无源蜂鸣器。作用：按一个键灯闪，按另一个键蜂鸣器鸣叫。-A toy products through interrupt to detect keys, control lights, produces a square wave drive passive buzzer. Role: Press a button lights flash, press another key buzzer.