Where is STM32L431CCT6 HAL API Manual
I am find STM32Cube\Repository\STM32Cube_FW_L4_V1.18.0\Drivers\STM32L4xx_HAL_Driver, but I don't know want is STM32L431 Manual

I am find STM32Cube\Repository\STM32Cube_FW_L4_V1.18.0\Drivers\STM32L4xx_HAL_Driver, but I don't know want is STM32L431 Manual

Hi @Wshuo.1
STM32L431CCT6 belongs to the STM32L4 Access Line as visible on
https://www.st.com/en/microcontrollers-microprocessors/stm32l4-series.html
It is a less-feature version of the STM32L433/STM32L443 products (STM32L443 being the STM32L433 with HW crypto/hash functions). You can then refer to STM32L443xx_User_Manual.chm listing all APIs considering that the ones specific to crypto/hash functions and peripherals not present on STM32L431 are not available for your device.
Regards
Patrice
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