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DAC80508: 两个关于DAC80508M的问题

Part Number: DAC80508

1. 请问DAC80508M的SPI总线支持三线模式吗?如果SPI总线上面只挂了一个DAC80508M,CS脚可以直接接地吗?

1. BRDCAST-DATA[15:0]寄存器无法写入数据,写操作以后读出来是全0,但其他寄存器可以正常写入,这是什么原因?