SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
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.