It seems to me that I have some misunderstanding here.
I was thinking that they are there to put pullups/pulldowns on a pin declared as input, but it seems that this is wrong.
I also seem to struggle with the documentation as of why wrpin ##$1_0000, tx_out set the pin to registered mode, it does work but where is that written in the documents.
What I need is to have inputs with a pull down attached so they do not float and toggle when nothing is connected or started yet.
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The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this post are to be interpreted as described in RFC 2119