SPRUJ55D September 2023 – July 2025 AM263P2 , AM263P2-Q1 , AM263P4 , AM263P4-Q1
The PRU-ICSS UART0 can be placed in the diagnostic mode using the [4]LOOP bit in the modem control register - UART_MCTR, which internally connects the PRU-ICSS UART0 output back to the PRU-ICSS UART0's input. In this mode, the transmit and receive data paths, the transmitter and receiver interrupts, and the modem control interrupts can be verified without connecting to another UART.