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STM32L073RZ LCD Configuration: CubeMX Cannot Assign VLCDrail1 to PB12

ECSL
Visitor

‎2026-05-10 10:55 AM

I’m setting up a new project in STM32CubeMX for an STM32L073RZ using the internal LCD controller in 1/3 bias mode.
According to the STM32L0 reference manual (RM0367), the LCD voltage rails should be configured as:

PB12 - VLCDrail1

PB2 - VLCDrail2

ECSL_0-1778435574858.png

 


However, in STM32CubeMX, the GPIO configuration only allows:

PB12 - VLCDrail2

PB2 - VLCDrail2

ECSL_1-1778435619125.png

ECSL_2-1778435630027.png


There does not appear to be any option to configure either pin as VLCDrail1.
Am I misunderstanding the LCD rail configuration for 1/3 bias mode on STM32L073RZ, or is this a limitation/bug in STM32CubeMX?

Thank you!

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