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使用TMS570LC4357芯片，ADC功能不需要使用，请问VCCAD与VSSAD管脚该如何处理呢？是直接悬空，还是VCCAD需要外接供电，VSSAD外接供电地？如果VCCAD需要外接供电，请问接多大电压呢？
