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Prevent System Mode bootloader from running in STM32L433

Question asked by Kane Livingstone on Jan 6, 2018

Hello there. Is there any way to prevent the System Mode bootloader from starting on STM32L433 devices? In the older devices (eg. STM32F334) you could just keep BOOT0 low so a blank device would never start up in any way. Now, when a device is blank you have to worry about 10+ pins triggering the bootloader and causing other pins to potentially become outputs and damage circuitry they're connected to. Is there some way to prevent this so I don't have to consider the post-reset state of dozens of "General Purpose" I/Os in my designs (especially when they may be expansion ports and I have no idea what might be connected to them)?