SH7205 Datasheet, PDF(1048/1904 Page) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7200 Series

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SH7205 Datasheet, PDF (1048/1904 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7200 Series

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Section 20 Controller Area Network (RCAN-TL1)

â¢ Message Transmission Request for Time Triggered communication

When the Time Triggered mode is used communications must fulfils the ISO11898-4

requirements.

The following procedure should be used.

ï£§ Send RCAN-TL1 to reset or halt mode

ï£§ Set TCMR0 to the Init_Watch_Trigger (0xFFFF)

ï£§ Enable TCMR0 compare match setting bit 10 of TTCR0

ï£§ Set TCMR2 to the specified Watch_Trigger value

ï£§ Keep TCMR2 compare match disabled by keeping cleared the bit 12 of TTCR0

ï£§ Set CMAX to the requested value (different from 111 bin)

ï£§ Set TEW to the requested value

ï£§ Configure the necessary Mailboxes for Time Trigger transmission and reception

ï£§ Set LAFM for the 3 LSBs of Mailbox 31

ï£§ Configure MCR, BCR1 and BCR0 to the requested values

ï£§ If working as a potential time master:

â¢ Set RFTROFF to the requested Init_Ref_Offset value

â¢ Set TXPR for Mailbox 30

â¢ Write H'4000 into TTTSEL

ï£§ Enable the TCNTR timer through the bit 15 of TTCR0

ï£§ Move to Transmission_Reception mode

ï£§ Wait for the reception or transmission of a valid reference message or for TCMR0 match

ï£§ If the local time reaches the value of TCMR0 the Init_Watch_Trigger is reached and the

application needs to set TXCR for Mailbox 30 and start again

ï£§ If the reference message is transmitted (TXACK[30] is set) set RFTROFF to zero

ï£§ If a valid reference message is received (RXPR[31] is set) then:

â¢ If 3 LSBs of ID of Mailbox 31 have high priority than the 3 LSBs of Mailbox 30 (if

working as potential time master) keep RFTROFF to Init_Ref_Offset

â¢ If 3 LSBs of ID of Mailbox 31 have lower priority than the 3 LSBs of Mailbox 30 (if

working as potential time master) decrement by 1 the value in RFTROFF

ï£§ Disable TCMR0 compare match by clearing bit 10 of TTCR0

ï£§ Enable TCMR2 compare match by setting bit 12 of TTCR0

ï£§ Only after two reference messages have been detected on the CAN Bus (transmitted or

received) can the application set TXPR for the other Time Triggered Mailboxes.

Rev. 1.00 Mar. 25, 2008 Page 1016 of 1868

REJ09B0372-0100

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