I am using a STM32L053 Discovery board and I am having an issue with the SMI clock line. I am trying to set the device up such that PB13 is the clock lick line (as SPI 2). The problem is that the clock only appears to be cycling from 1.5V to 3V. It's as if the line is floating at 1.5V during sleep phase. If I set the SPI up on SPI 1 so PB3 is the clock line this is fine. There is some issue on PB13 being used as the clock line. I can't even drive this to 0V when I set it as a general IO pin and set it to zero. Anyone aware of an issue affecting this particular line?