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C6748外部中断响应引脚时间为3us是不是太长了?

大家好,问个问题,在使用C6748做中断处理时,发现响应外部中断信号的时间是3us,:外部信号到进入中断后立即输出一高电平信号。 这个时间也太长了吧,系统使用的是时钟频率时456M。