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cdce72010的输出是否有问题,是否是我寄存器配置的问题呢?

大家好,我通过SPI给cdce配置之后第四路输出的时钟波形为什么会周期性的出现高电平?如下图

每一个寄存器配置如下:

683C0350
68000021
83840002
68000003
E9800004
68000005
68000006
83400017
68000098
68050CC9
05FC270A
A000040B
0000180C

请问是哪出了问题?