r5f71374an80fpv Renesas Electronics Corporation., r5f71374an80fpv Datasheet - Page 799

• Manufacturer Part Number: r5f71374an80fpv
• Description: 32-bit Risc Microcomputer Superh?? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

19.4.3
• Message Transmission Request
The following sequence is an example to transmit a CAN frame onto the bus. As described in
the previous register section, please note that IRR8 is set when one of the TXACK or ABACK
bits is set, meaning one of the Mailboxes has completed its transmission or transmission
abortion and is now ready to be updated for the next transmission, whereas, the GSR2 means
that there is currently no transmission request made (No TXPR flags set).
RCAN-ET is in Tx_Rx Mode
Write '1' to the TXPR[x] bit
Update Message Data of
Message Transmission Sequence
at any desired time
'x' Highest Priority?
Transmission Start
Internal Arbitration
(MBC[x] = 0)
Mailbox[x]
Yes
CAN Bus
Arbitration
Figure 19.10 Transmission Request
No
Mailbox[x] is ready
to be updated for
next transmission
Clear TXACK[x]
TXACK[x] = 1?
IRR8 = 1?
Yes
Yes
Acknowledge Bit
Section 19 Controller Area Network (RCAN-ET)
Rev. 1.00 Sep. 21, 2007 Page 773 of 1124
No
No
CAN Bus
Waiting for interrupt
Waiting for interrupt
REJ09B0402-0100