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DAC7564输出死锁问题

Other Parts Discussed in Thread: DAC7564

 我用DAC7564输出,发现DAC7564会不定时的出现某通道输出死锁的现象(就是输出固定在某一值,不能再改变了)。断电重启后又正常了。

  是用IO口模拟的SPI,在发送命令前关中断,发送完后再开中断。

 

请问指点一下,这种情况可能是什么原因引起的?用这个芯片要注意什么方面?