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Hi
我做模拟电源的,单片机虽然不熟悉,但是数据设置,高位或者低位应该都是可以的,选用高位对齐应该简单点,因为配置18位需要3个8位,而这个数据是18位,从高位开始,后续除了0~3位设置位0位,其他多余的位也可以为零。