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TMS320F280039C: AGPIO

Snow yu
Prodigy 10 points
Part Number: TMS320F280039C

你好，我在配置TMS320F280039C 100 Pin的GPIO20为ADC采样B5,但是用开发板测试时发现B5 pin 一直有采样，而GPIO20采样没有值，请问B5和GPIO20复用的B5需要如何配置确定只让GPIO20连接ADC采样