Version 4.24.0 STM32CubeMX - STM32F303RCTx has pin 18 as PF4 instead VSS - thought I had an extra signal!!
But it probably *is* PF4.
Very well spotted - I hadn't considered that I had an old(er) version of the spec. I must have downloaded it just a month or so before the update as that is when I started using the F303.
Retrieving data ...