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Setting conditions for starting transmission (only for transmission of data frame)
Set RFWTx of the remote frame receiving wait register (RFWTR) to 0 to start transmission immediately
after a request for data frame transmission is set (TREQx of the transmission request register (TREQR) is 1
and TRTRx of the transmission RTR register (TRTRR) is 0).
Set RFWTx to 1 to start transmission after waiting until a remote frame is received (RRTRx of the remote
request receiving register (RRTRR) becomes 1) after a request for data frame transmission is set (TREQx =
1 and TRTRx = 0).
Note:
Remote frame transmission can not be made, if RFWTx is set to 1.
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Setting transmission complete interrupt
When generating a transmission complete interrupt, set TIEx of the transmission complete interrupt enable
register (TIER) to 1.
When not generating a transmission complete interrupt, set TIEx to 0.
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Setting transmission request
For a transmission request, set TREQx of the transmission request register (TREQR) to 1.
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Canceling transmission request
When canceling a pending request for transmission to the message buffer (x), write 1 to TCANx of the
transmission cancel register (TCANR).
Check TREQx. For TREQx = 0, transmission cancellation is terminated or transmission is completed.
Check TCx of the transmission complete register (TCR). For TCx = 0, transmission cancellation is
terminated. For TCx = 1, transmission is completed.
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Processing for completion of transmission
If transmission is successful, TCx of the transmission complete register (TCR) becomes 1.
If the transmission complete interrupt is enabled (TIEx of the transmission complete interrupt enable
register (TIER) is 1), an interrupt occurs.
After checking the transmission completion, write 0 to TCx to set it to 0. This cancels the transmission
complete interrupt.
In the following cases, the pending transmission request is canceled by receiving and storing a message.
• Cancel the request for data frame transmission by reception of data frame
• Cancel the request for remote frame transmission by reception of data frame
• Cancel the request for remote frame transmission by reception of remote frame
Request for data frame transmission is not canceled by receiving and storing a remote frame. ID and DLC,
however, are changed by the ID and DLC of the received remote frame. Note that the ID and DLC of data
frame to be transmitted become the value of received remote frame.