STM32L071RBT6 is in use. There seems to be a TTL port and a CMOS port, but where is the description of which port is TTL and which port is CMOS? Also, how should I switch when all ports support TTL and CMOS?

[Tesla DeLorean]

Are you sure it's just not accommodative of VIL/VIH for either?

Data Sheet would be controlling document for pins, levels, expectations, etc.

[waclawek.jan]

https://community.st.com/s/question/0D50X00009XkZK8SAN/output-port-voltage-vevel-in-stm32f4