I use STM8L152 in my PCBA. Since I don't use LCD function, so I don't connect anything to pin9 VLCD and I don't set any LCD register in my firmware. Is there any thing must be configured with pin9 VLCD for normal use of STM8L152?

[Imen.D]

Hello @GLau.1​ and welcome to the Community :)

On the STM8L152 devices, If the LCD feature is not used, you must connect the VLCD pin to VDD.

I advise you to have a look at the AN3029 Application note “Getting started with STM8L and STM8AL�?, is very helpful:

 

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Imen

[GLau.1]

Hi Imen, noted and thanks, but for some reason, I have to let pin9 VLCD floating and it seems that MCU works mormally now.

So could you please advise is there any potential risk?