Open drain output pin on KL25Z?

[markosiponen]

How should I do to set a GPIO output pin as open drain?

There seems to be no option for that?

Or should I set the GPIO as input when I want to set the pin high and set the GPIO as low output when I want to set the pin low?

[Paul_Tian · Accepted solution]

Hi, Markosiponen

First, KL series has not open drain control register.

Then I think your solution is OK.  One reminder is attention to pull-up resistor value selection.

Best Regards

Paul