Renesas R5S72622 Manual Do Utilizador
Section 20 Controller Area Network
Page 1070 of 2108
R01UH0134EJ0400 Rev. 4.00
Sep
24,
2014
SH7262 Group, SH7264 Group
The following settings were used in the above example:
rep_factor
(register)
(register)
Offset
TTW[1:0]
MBC[2:0]
Mailbox-24 3'b001 6'b000000
2'b00 3'b000
Mailbox-25 3'b000 6'b000000
2'b10 3'b000
Mailbox-26 3'b000 6'b000000
2'b10 3'b000
Mailbox-27 3'b000 6'b000000
2'b11 3'b000
Mailbox-28 3'b010 6'b000001
2'b00 3'b000
Mailbox-29 3'b011 6'b000110
2'b01 3'b000
Mailbox-30
3'b111
Mailbox-31
3'b011
CMAX = 3'b011, TXPR[30] = 0
During merged arbitrating window, request by time-triggered transmission is served in the way of
FCFS (First Come First Served). For example, if Mailbox-25 cannot be transmitted between Tx-
Trigger Time 25 (TTT25) and TTT26, Mailbox-25 has higher priority than Mailbox-26 between
TTT26 and 28.
FCFS (First Come First Served). For example, if Mailbox-25 cannot be transmitted between Tx-
Trigger Time 25 (TTT25) and TTT26, Mailbox-25 has higher priority than Mailbox-26 between
TTT26 and 28.
MBC needs to be set into 3'b111, in order to disable time-triggered transmission. If this module is
Time Master, MBC[30] has to be 3'b000 and time reference window is automatically recognized
as arbitrating window.
Time Master, MBC[30] has to be 3'b000 and time reference window is automatically recognized
as arbitrating window.
Timer Operation
Figure 20.23 shows the timing diagram of the timer. By setting Tx-Trigger Time = n, time trigger
transmission starts between CYCTR = n + 2 and
CYCTR = n + 3.
Figure 20.23 shows the timing diagram of the timer. By setting Tx-Trigger Time = n, time trigger
transmission starts between CYCTR = n + 2 and
CYCTR = n + 3.