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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
Associate II

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.

4 REPLIES 4
TDK
Guru

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.

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IGAL TALOR
Associate II

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

where can I find explanation about it?

As TDK said:

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

JW

Hi @IGAL TALOR​ ,

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

-Amel

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