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TVP5158的时钟信号消失

Other Parts Discussed in Thread: TVP5158

您好,请教一下、

在使用TVP5158对640x480的逐行视频进行解码时,运行一段时间后(时间长短不一,在1-7小时之间)就没有时钟信号了,这时读到TVP5158里的寄存器的值显示有视频数据,这会是什么原因导致的?