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BRR of STM32F401RCT6 changed when hot swapping

Pzhu.1
Associate II

When the USART is  hot swapping,some datas will occur on TX RX pin;and the value of BRR register will be changed;the picture 1 shows the BRR before  hot swapping;and the picture 2 shows the BRR after  hot swapping.

Why this question happens?And what can I do to avoid this quetion?​

2 REPLIES 2
TDK
Guru

> When the USART is hot swapping

What do you mean by this? What is being hot swapped?

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Pzhu.1
Associate II

0693W000005B6ugQAC.pngthis is picture10693W000005B6ubQAC.pngthis is picture 2

The USART of STM32 is connected to another terminal with a network cable;when plugging the cable,some Interference  datas like"FF"will occur on the RX pin of STM32 ;then the value of BRR will be change 。