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Section 20 Controller Area Network
R01UH0134EJ0400 Rev. 4.00 Page 1065 of 2108
Sep 24, 2014
SH7262 Group, SH7264 Group
Figures 20.19 and 20.20 show examples of configurations for (Potential) Time Master and Time
Slave. "L" in diagrams shows the length in time of the time reference messages.
Watch_Trigger
TCMR2
<Configuration> Cycle Time varies between L and Time_Ref + L
<Potential> Time Master
Cycle Time = 0 = L
Cycle Time
= Time_Ref
= Time_Ref + L
CCR = 1
CCR = 2
CCR = 1
CCR = 1
CCR = 0
capture timestamp
at SOF of transmission
Ref_Mark is updated
at successful end of time reference transmission
= Time_Ref + L
Time_Mark 1
TTT in MB24
Time_Mark 2
TTT in MB25
Time_Mark 3
TTT in MB26
Time_Mark 4
TTT in MB27
Time_Mark 5
TTT in MB28
Time_Mark 6
TTT in MB29
Time_Ref
TTT in MB30
Time_Mark 1
TTT in MB24
Time_Mark 2
TTT in MB25
Time_Mark 3
TTT in MB26
Time_Mark 4
TTT in MB27
Time_Mark 5
TTT in MB28
Time_Mark 6
TTT in MB29
Time_Ref
TTT in MB30
Time_Mark 1
TTT in MB24
Time_Mark 2
TTT in MB25
Time_Mark 3
TTT in MB26
Time_Mark 4
TTT in MB27
Time_Mark 5
TTT in MB28
Time_Mark 6
TTT in MB29
Time_Ref
TTT in MB30
increment CCR
(updated CCR has to be transmitted)
copy CCR from received time reference at reception completion
(no reception in Time Master)
<Normal Operation>
L
Figure 20.19 (Potential) Time Master