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TMS320F28375S: Question for GPIO.

Part Number: TMS320F28375S

Dear team:
Recently I am using TMS320F28375S for my project, And I found a strange phenomenon.
I configured one of the GPIOs as an output channel and set it to low potential. But after I accessed it to Vcc and removed, This pin jumped to high potential and the internal pin register setted to 1. V.v.
But there is no such speciality on F2811 when I test on it.
So I want to know whether it is an expected design characteristics? Can I shield this function?

Best Regards
K.K