SH7263 Datasheet, PDF (1023/1862 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7260 Series

Section 19 Controller Area Network (RCAN-TL1)
(1) Time Triggered Transmission
RCAN-TL1 offers a H/W support to perform communication in Time Trigger mode in line with
the emerging ISO-11898-4 Level 1 Specification.
This section reports the basic procedures to use this mode.
• Setting Time Trigger Mode
In order to set up the time trigger mode the following settings need to be used.
⎯ CMAX in CMAX_TEW must be programmed to a value different from 3'b111.
⎯ Bit 15 in TTCR0 has to be set, to start TCNTR.
⎯ Bit 6 in TTCR0 has to be cleared to prevent TCNTR from being cleared after a match.
⎯ DART in Mailboxes used for time-triggered transmission cannot be used, since for Time
Triggered Mailboxes, TXPR is not cleared to support periodic transmission.
• Roles of Registers
The user registers of RCAN-TL1 can be used to handle the main functions requested by the
TTCAN standard.
TCNTR
Local Time
RFMK
Ref_Mark
CYCTR
Cycle Time = TCNTR - RFMK
RFTROFF
Ref_Trigger_Offset for Mailbox-30
Mailbox-31
Mailbox dedicated to the reception of time reference message
Mailbox-30
Mailbox dedicated to the transmission of time reference message when
working as a potential time master
Mailbox-29 to 24 Mailboxes supporting time-triggered transmission
Mailbox-23 to 16 Mailboxes supporting reception without timestamp (may also be
implemented as Mailboxes supporting Event Triggered transmission)
Mailbox-15 to 0 Mailboxes supporting reception with timestamp timestamp (may also be
implemented as Mailboxes supporting Event Triggered transmission)
Tx-Trigger Time Time_Mark to specify when a message should be transmitted
Rev. 2.00 Mar. 14, 2008 Page 989 of 1824
REJ09B0290-0200