SFUART_IRQ_PENDING_RXQM
SFUART_IRQ_PENDING_RXQM) != 0);
if ((reg & SFUART_IRQ_PENDING_RXQM) != 0)
reg &= ~(SFUART_IRQ_ENABLE_TXWM | SFUART_IRQ_PENDING_RXQM);
reg |= SFUART_IRQ_ENABLE_TXWM | SFUART_IRQ_PENDING_RXQM;