How to keep GPIO low at power on reset stage?

[hubertwu]

Normally, GPIO default pull-up which cannot be changed by configuring register.

If I need to ensure GPIO at low level, how can I do? 

[Carlos_Mendoza]

Hi Hubert Wu,

Unfortunately, there is no way to change the GPIO default state, you will need to add an external pull down resistor to place the pin in the desired state.

Hope it helps!

Best Regards,
Carlos Mendoza
Technical Support Engineer