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DLP4500外触发帧频问题

使用J11外触发信号接口,通过TRIG1_IN_CON接口给脉冲信号,信号源flash,设置出发模式为上升沿外触发,触发脉冲为10HZ 时,投影正常,触发脉冲超过10HZ时,投影异常,投影效果为多福图片叠加效果,这是什么问题?