38.3.2.2 Restriction of Transmission Attempts

ISO11898-1:2015 requires that frames that lost arbitration and are not Acknowledged, or are destroyed by errors, are automatically retransmitted. Optionally, the number of retransmission attempts can be limited. When the RTXAT bit is set, retransmission attempts can be limited using the TXAT[1:0] bits in the FIFO Control registers. If the RTXAT bit is clear, then the TXATx bits in the FIFO Control register are ignored and the retransmission attempts are unlimited.