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DACx1416不能输出方波



详细如下,按照数据手册的TOGGLE Mode流程编写程序,将TOGGLE引脚接入PWM信号,发现实际并没有方波电压生成,而只输出Register B的电压值,请问这是什么原因?
需输出方波电压,根据9.4.1描述编程,实际结果为Register B的电压,非方波。调试过程中发现,按照编程流程,Register A和B的电压均能输出,Toggle引脚接入PWM信号,不能输出方波,设置的寄存器已合适无误