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https://bravikov.wordpress.com/2012/08/24/%d1%81%d0%ba%d0%be%d1%80%d0%be%d1%81%d1%82%d1%8c-%d0%bf%d0%b5%d1%80%d0%b5%d0%b4%d0%b0%d1%87%d0%b8-%d0%b4%d0%b0%d0%bd%d0%bd%d1%8b%d1%85-%d1%87%d0%b5%d1%80%d0%b5%d0%b7-uart/
Скорость передачи данных через UART