English
The counter has two functions: one is to count in three ways: 60s, 50s and 5s according to the requirements of vehicle operation time and yellow light switching time on main roads and branch roads; The other is to send a state transition signal to the main controller, and the main controller performs state transition according to the state transition signal.Chinese
计数器有两种功能：一种是根据主干道和支路上车辆运行时间和黄灯切换时间的要求，以60s、50s和5s三种方式进行计数；另一种是向主控制器发送状态转换信号，主控制器根据状态转换信号进行状态转换。
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