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Bootloader UART selection

Question asked by n.serina on Sep 8, 2017
Latest reply on Sep 8, 2017 by Clive One

Hello , 

In this picture Bootloader of stm32f446X tries to read 0x7f from the usart without initializing  the usart. how that is possible ? it configures the USART later. am i missing something ?

also why 0x7f is chosen ? any reason behind this ?

I am guessing bootloader does not read 0x7f from the USART data register, please clarify .. Thank you 

 

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