EVA下面的通用定时器T1工作于连续增/减计数模式，产生对称的PWM波形。通过 * T1的周期中断来计时，每隔1s钟改变1次占空比。死区时间为4.27us。-EVA the following general-purpose timer T1 operates in continuous up/down counting mode, resulting in symmetric PWM waveform. By* T1 interrupt the cycle time, clock chan