On the STM8L101F1U, some IO port register bits do not have actual pins on the package. How should these register bits be initialized? Should I set them to input pullup, output or just input floating? Note: Part does NOT have COMP_REF.

[S.Ma]

As long as the io is not floating, the main difference might be small consumption change between say open drain low and push pull high, in low power mode.

[AMacd.1]

How do I know whether IO that don't appear at external pins, such as PA4-7, PC5-7, and PD1-7 are floating or not?

[AMacd.1]

Maybe this is just a case of TL;DR on my part; Going back to the user guide, I find this: "Warning: On some packages, some ports must be considered as active even if they do not exist on the package. To avoid spurious effects, configure them as pullup-inputs without interrupt at startup , and keep them in this state when changing the port configuration. Refer to the datasheet for additional information."

I guess I can assume that this warning applies to the part in question (STM8L101F1U) but the existence of a similar warning in the data sheet that applies only to the COMP_REF part STM8L101F1U6A) has thrown me off a bit. Why would the data sheet apply this warning only to the COMP_REF parts?