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关于DAC7564使用外部参考的问题

Other Parts Discussed in Thread: DAC7564

Dear TI engineers,我是用MOS做开关,通过单片机控制外部参考电压,我设计的A1,A0地址为11,在初始化DAC7564的时候,先禁用内部2.5v参考(0x00c12000),然后导通mos管使用5v外部参考,但是这个方案有个问题,就是偶尔会出现禁用指令失败的情况,请问这是为什么呢?手册上给的指令是012000h,意思是地址为A1,A0=00的时候的指令么?