1： You should offer us the chip part number.
2： Generally, the pins can direct connect to Ground or floating if unused except the PSoC4000 P1.6.
3： For PSoC4000，the Pin 1.6 can't be connected to Ground if unused.
4： Could you offer us the discussion linker which give the guide that should connect to 10k resistor?
Hi Lingling ,
My customer ask is there any further information ? Is there some risk that unused pins be configured internal pull up or pull down ?And 0 or 1 output?
I think it is not necessary to configure the unused pin to resistor pull up or pull down, it is better to let the pin drive mode Analog High Z.
In the previous discussion, Roy gives suggestion that connect 10k resistor to unused pin , aims to avoid the instantaneous noise.
if customer configure the pin to pull up or pull down, it even can increase the damage risk.
As a conclusion, if the customer don't want to let connect the 10k resistor to unused pin, they can let them float, or connect to Ground direct.