46.7.9.9.1 Underrun Error
If the USART is in LON mode and if a character is sent while the Transmit Holding register (FLEX_US_THR) is empty, the UNRE bit flag is set.
If the USART is in LON mode and if a character is sent while the Transmit Holding register (FLEX_US_THR) is empty, the UNRE bit flag is set.
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