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SK-TDA4VM: GPIO set does not always set the OUT register

Part Number: SK-TDA4VM

Hello, 

We are trying to set the GPIO register through the set register as explained in the block diagram:

However, that only works sometimes and sporadically the value does not get changed in the OUT register:

Do you have please hints that we could follow to solve the issue?

Thank you,

Best Regards,

Khalil