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STM32L476 on NUCLEO-L476RG Baudrate with CubeMX

Question asked by Juergen Marquardt on Jun 29, 2017

Configured USART1 of mcu to 500 kbit/sec using STM32CubeMX Version 4.21.0.
Code created by Cube seems to be correct.
Measurement shows that bitrate is 250 kbit ( a 10 bit character needs 40 µsec).
See Attachements.

USART1 clock is 80 MHz. Comes from 16 MHz HSI RC, via PLL (x10, /2) PLLCLK to SYSCLK.

Do not know where the error is...
Best regards Juergen