明白了,是中文手册把第2位的作用写反了,原文如下:
When RnB low to high transition is occurred, this value set and
issue interrupt if enabled. To clear this value write ‘1’.
0: RnB transition is not detected
1: RnB transition is detected
Transition configuration is set in RnB_TransMode(NFCONT[8]).
麻烦您了啊,版主了