The CAN controller supports automatic answering of RTR message requests. All 32 receive buffers support this feature. If an RTR message is accepted in a receive buffer where the RTRreply flag is set, then this buffer automatically replies to this message with the content of this receive buffer. The RTRreply pending flag is set when the RTR message request is received. It is cleared when the message is sent or when the message buffer is disabled. To abort a pending RTRreply message, use the RTRabort command.
If the RTR auto-reply option is selected, the RTR sent (RTRS) flag is asserted when the RTR auto-reply message is successfully sent. It is cleared by writing 1
to it.
An RTR message interrupt is generated, if the MsgAv_RTRS flag and RxIntEbl are set. This interrupt is cleared by clearing the RTRS flag.