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AD配置中多余寄存器位的理解????

1、着急确认下在28377D中关于差分16bitAD的配置中,有关于ADCIN6和ADCIN7以及更多如ADCIN8和ADCIN9等组合成一个16bit的差分输入,可是实际上A/B/C/D口通常都只有6个管脚,最多到ADCIN5,这部分怎么理解?急!

2、28377D中在管脚的说明中有关于ADCIN14/ADCIN15的描述,如下:

了解ADCIN14/15可以作为通用AD管脚,可是后面的Calibrate all ADCs together...就不明白了,请高手赐教!!!!