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STM32F031 uart bootloader signal levels

Question asked by Gregory Holcomb on Jun 30, 2017
Latest reply on Jul 2, 2017 by Clive One

I have a design where another micro is connected to the STM32F031 UART pins and I am attempting to enter the rom bootloader.  I referenced AN3155 for details on how the bootloader works, however, there is no definition I could find for the serial connection besides 8-E-1 and baud rate.  Are the signal levels high true, low true, idle high, idle low etc, or will it detect the levels I am using and responded accordingly?