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使用STM32F407驱动DAC7615输出单路信号时没有问题，现在想同时输出四路信号时，就出现了问题，请问这个该怎么实现了？
现在采取的四路是，先利用地址和REG引脚分别更新A、B、C、D四个通道INPUT寄存器中的值，更新完成后，再通过拉低DAC引脚更新DAC转换输出，但是只有最后一个通道D的输出结果是正确的，其他的都不对，请问这是原因呢，是时序还有问题么？
应该可以通过 LOADDACS 实现.
All DAC registers become transparent when LOADDACS is LOW. They are in the latched state when LOADDACS is HIGH.
