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LED驱动芯片TLC6C5724 输出PWM波形异常

我尝试使用18ms的时间通过SPI向TLC6C5724发送 Function Control,Brightness Control,and Dot Correction Data(没有将BLANK信号置到低电平),出现了下面图片中的情况:在LATCH信号置为高,开始写入数据时,OURT0输出脚的PWM波形立即出现了变化。直到写入Grayscale Data后PWM恢复正常。

我想了解,在不将BLANK信号置为低电平的情况下,以较长的时间发送一帧Function Control,Brightness Control,and Dot Correction Data,出现这种现象是否正常呢?