Hi, I am going to use this STM32H7 CPU at my board and I want to know what the GPIOs state during power up, configuration and reset.

[IGAL TALOR]

are the GPIOs at HI-z? pulled up? or Pulled down?

this is very important to me, I don't want to enable any circuit at start up.

[TDK]

Generally, they are in high impedance mode with no pullup/pulldown. Pins used for SWD/JTAG programming are the exception. The reference manual will provide this information in the GPIO registers section.

[IGAL TALOR]

I tried to find it at the datasheet or application note, nothing about it.

where can I find explanation about it?

[Amel NASRI]

Hi @IGAL TALOR​ ,

The application note STM32 GPIO configuration for hardware settings and low-power consumption (AN4899) should be useful for you.

-Amel

[waclawek.jan]

As TDK said:

The reference manual will provide this information in the GPIO registers section.

JW