SPRUI30H November 2015 – May 2024 DRA745 , DRA746 , DRA750 , DRA756
This section describes common instructions for FIR and MIR mode programming.
At the end of a frame reception, the MPU reads the line status register (UART3.UART_LSR) to detect errors in the received frame.
When the UART3.UART_MDR1[6] SIP_MODE bit is set to 1, the TX state-machine always sends one SIP at the end of a transmission frame. However, when the SIP_MODE bit is set to 0, SIP transmission depends on the UART3.UART_ACREG[3] SEND_SIP bit.
The MPU can set the SEND_SIP bit at least once every 500 ms. The advantage of this approach over the default approach is that the TX state-machine does not have to send the SIP at the end of each frame, thus reducing the overhead required.