SPRUHZ7K August 2015 – April 2024 AM5706 , AM5708 , AM5716 , AM5718 , AM5718-HIREL
In FIFO polled mode (the UARTi.UART_FCR[0] FIFO_EN bit is set to 0 and the relevant interrupts are disabled by the UARTi.UART_IER register), the status of the receiver and transmitter can be checked by polling the line status register (UARTi.UART_LSR).
This mode is an alternative to the FIFO interrupt mode of operation in which the status of the receiver and transmitter is automatically determined by sending interrupts to the MPU.