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LPC55S69 : Special GPIO pins

Question asked by Eugene Hiihtaja on Feb 4, 2020
Latest reply on Feb 7, 2020 by ZhangJennie

Hi !


In DS chapter 6.1 is written like this:



All pins have all pull-ups, pull-downs, and inputs turned off at reset except PIO0_2,
PIO0_5, PIO0_11, PIO0_12, PIO0_13 and PIO0_14 pins. This prevents power loss
through pins prior to software configuration. Due to special pin functions, some pins have
a different reset configuration. PIO0_5 and PIO0_12 pins have internal pull-up enabled by
default, and PIO0_2 and PIO0_11 have internal pull-down enabled by default. PIO0_13
and PIO0_14 are true open drain pins. Refer to pin description table for default reset


Can I interpret this like this :


- under Reset those pins have Z-state  or for example PIO0_5 keep PU is even under Reset

- after Reset ( At the end of Reset ) there are special configuration applied

- by SW I can apply any other configuration later on. And not exists any limitations of any pin what configuration can be set. And everything is specified in Table 3 of DS.