SH7263 Datasheet, PDF (958/1862 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7260 Series

Section 19 Controller Area Network (RCAN-TL1)
Please note that the CCR value is only embedded on the frame transmitted but not stored back into
Mailbox 30.
When CMAX!= 3'b111, MBC[31] = 3'b011 and TXPR[31] is cleared, Mailbox-31 is configured
as reception of time reference. When a valid reference message is received (DLC > 0) RCAN-TL1
performs internal synchronisation (modifying its RFMK and basic cycle CCR).
MB30 - 31
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
H'108 + N*32 Next_is_Gap/Cycle_Counter (first Rx/Tx Byte)
MSG_DATA_1
Byte/Word/LW
H'10A + N*32
MSG_DATA_2
MSG_DATA_3
Byte/Word
H'10C + N*32
MSG_DATA_4
MSG_DATA_5
Byte/Word/LW
H'10E + N*32
MSG_DATA_6
MSG_DATA_7
Byte/Word
Data
Figure 19.5 Message Data Field
(4) Timestamp
Storage for the Timestamp recorded on messages for transmit/receive. The Timestamp will be a
useful function to monitor if messages are received/transmitted within expected schedule.
• Timestamp
Bit: 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
TS15 TS14 TS13 TS12 TS11 TS10 TS9 TS8 TS7 TS6 TS5 TS4 TS3 TS2 TS1 TS0
Initial value: 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
R/W: R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
Message Receive: For received messages of Mailbox-15 to 0, Timestamp always captures the
CYCTR (Cycle Time Register) value or Cycle_Counter CCR[5:0] + CYCTR[15:6] value,
depending on the programmed value in the bit 14 of TTCR0 (Timer Trigger Control Register 0) at
SOF.
For messages received into Mailboxes 30 and 31, Timestamp captures the TCNTR (Timer
Counter Register) value at SOF.
Message Transmit: For transmitted messages of Mailbox-15 to 1, Timestamp always captures the
CYCTR (Cycle Time Register) value or Cycle_Counter CCR[5:0] + CYCTR[15:6] value,
depending on the programmed value in the bit 14 of TTCR0 (Timer Trigger Control Register 0), at
SOF.
For messages transmitted from Mailboxes30 and 31, Timestamp captures the TCNTR (Timer
Counter Register) value at SOF.
Rev. 2.00 Mar. 14, 2008 Page 924 of 1824
REJ09B0290-0200