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M16C/29 Group
17.10.2. Transmission
Figure 17.26 shows the timing of the transmit sequence.
TrmReq bit
TrmActive bit
SentData bit
CAN0 Successful
Transmission Interrupt
TrmState bit
TrmSucc bit
MBOX bit
j = 0 to 15
Figure 17.26 Timing of Transmit Sequence
(1) If the TrmReq bit in the C0MCTLj register (j = 0 to 15) is set to "1" (Transmission slot) in the bus idle
state, the TrmActive bit in the C0MCTLj register and the TrmState bit in the C0STR register are set to
"1" (Transmitting/Transmitter), and CAN module starts the transmission.
(2) If the arbitration is lost after the CAN module starts the transmission, the TrmActive and TrmState bits
are set to "0".
(3) If the transmission has been successful without lost in arbitration, the SentData bit in the C0MCTLj
register is set to "1" (Transmission is successfully completed) and TrmActive bit in the C0MCTLj
register is set to "0" (Waiting for bus idle or completion of arbitration). And when the interrupt enable
bits in the C0ICR register = 1 (Interrupt enabled), CAN0 successful transmission interrupt request is
generated and the MBOX (the slot number which transmitted the message) and TrmSucc bit in the
C0STR register are changed.
(4) When starting the next transmission, set the SentData and TrmReq bits to "0". And set the TrmReq
bit to "1" after checking that the SentData and TrmReq bits are set to "0".
Rev.1.00 Nov 01,2004
REJ09B0101-0100Z
SOF
CTx
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page 304 of 402
SOF
ACK
EOF
IF
(4)
(3)
(3)
(3)
Transmission slot No.
17. CAN Module
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