Renesas SH7264 ユーザーズマニュアル
Section 20 Controller Area Network
Page 1002 of 2108
R01UH0134EJ0400 Rev. 4.00
Sep
24,
2014
SH7262 Group, SH7264 Group
Please note that for Mailbox 30 TTW is fixed to '01', Offset to '00' and rep_factor to ‘0’.The
following tables report the combinations for the rep_factor and the offset.
following tables report the combinations for the rep_factor and the offset.
Rep_factor Description
3'b000 Every
basic cycle (initial value)
3'b001 Every
two
basic cycle
3'b010 Every
four
basic cycle
3'b011 Every
eight
basic cycle
3'b100 Every
sixteen
basic cycle
3'b101
Every thirty two basic cycle
3'b110
Every sixty four basic cycle (once in system matrix)
3'b111 Reserved
The Offset Field determines the first cycle in which a Time Triggered Mailbox may start
transmitting its Message.
transmitting its Message.
Offset Description
6'b000000
Initial Offset = 1
st
Basic Cycle (initial value)
6'b000001
Initial Offset = 2
nd
Basic Cycles
6'b000010
Initial Offset = 3
rd
Basic Cycles
6'b000011
Initial Offset = 4
th
Basic Cycles
6'b000100
Initial Offset = 5
th
Basic Cycles
6'b111110
Initial Offset = 63
rd
Basic Cycles
6'b111111
Initial Offset = 64
th
Basic Cycles
The following relation must be maintained:
Cycle_Count_Maximum + 1 >= Repeat_Factor > Offset
Cycle_Count_Maximum
=
2
CMAX
- 1
Repeat_Factor
=
2
rep_factor