向蜂鸣器发送一定频率的方波可以使蜂鸣器发出相应的音调 该实验通过设计一个状态机和分频 器使蜂鸣器发出"多来咪发梭拉西多"的音调。 -Sent to the buzzer frequency square wave of the experiment through the design of a state machine and divider buzzer sounded " more than a microphone Fat shuttle Rasi multi to