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Wjian.4 · 2021-01-25

So,LPUART can not use LSE to configure BaudRate 9600?

Wjian.4 · 2021-01-26

So，is my idea right? The LPUART can not use LSE to configure BaudRate 9600?The error values in RM0377 are Wrong？Can you provide the actual error value when configure BaudRate 9600?Regards

Wjian.4 · 2021-01-26

I tried.The value of BBR is set to 0x0036a.When the baud rate is set to 4800,The value of BBR is set to 0x006d4. And actual BaudRate is 4672，The error is less than 3%. 32768 divided by 7 is 4681.So,the error of 4800 is small.As shown in the figure b...

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STM32L071 MCU LPUART use LSE to configure BaudRate 9600. Actual BaudRate is 8300 or 11000.Error islarge. LSE is 32.768kHz ,One cycle is 30.517 us。One cycle of BaudRate 9600 is 3.4 times of LSE。But LSE frequency division can only be an integral multiple。

Re: STM32L071 MCU LPUART use LSE to configure BaudRate 9600. Actual BaudRate is 8300 or 11000.Error islarge. LSE is 32.768kHz ,One cycle is 30.517 us。One cycle of BaudRate 9600 is 3.4 times of LSE。But LSE frequency division can only be an integral multiple。

Re: STM32L071 MCU LPUART use LSE to configure BaudRate 9600. Actual BaudRate is 8300 or 11000.Error islarge. LSE is 32.768kHz ,One cycle is 30.517 us。One cycle of BaudRate 9600 is 3.4 times of LSE。But LSE frequency division can only be an integral multiple。