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R01UH0336EJ0102 Rev.1.02
Page 1130 of 1538
Jul 17, 2014
V850E2/PG4-L
Section 20 CAN Controller (FCN)
20.13 Baud Rate Settings
20.13.1
Baud Rate Setting Conditions
Make sure that the settings are within the range of limit values shown below for
ensuring correct operation of the CAN controller.
• 5 TQ
≤
SPT (sampling point)
≤
17 TQ
SPT = TSEG1 + 1
• 8 TQ
≤
DBT (data bit time)
≤
25 TQ
DBT = TSEG1 + TSEG2 + 1 TQ = TSEG2 + SPT
• 1 TQ
≤
SJW (synchronization jump width)
≤
4 TQ
SJW
≤
DBT - SPT
• 4
≤
TSEG1
≤
16
• 1
≤
TSEG2
≤
8
Note 1.
TQ = 1/f
TQ
(f
TQ
: CAN protocol layer reference system clock)
Note 2.
The values TSEG1, TSEG2, and SJW are defined by the following register
bits.
TSEG1 = FCNnCMBTCTL.FCNnCMBTS1LG[3:0] + 1
TSEG2 = FCNnCMBTCTL.FCNnCMBTS2LG[2:0] + 1
SJW = FCNnCMBTCTL.FCNnCMBTJWLG[1:0] + 1
Table 20-19, Settable Bit-Rate Combinations, shows combinations of bit rates
that meet the above conditions.
Table 20-19
Settable Bit-Rate Combinations (1/3)
Valid Bit-Rate Setting
FCNnCMBTCTL Setting Value
Sampling
Point
(Unit: %)
DBT
Length
SYNC
SEGMENT
PROP
SEGMENT
PHASE
SEGMENT 1
PHASE
SEGMENT 2
FCNnCMBTS1LG
[3:0]
FCNnCMBTS2LG
[2:0]
25
1
8
8
8
1111
111
68.0
24
1
7
8
8
1110
111
66.7
24
1
9
7
7
1111
110
70.8
23
1
6
8
8
1101
111
65.2
23
1
8
7
7
1110
110
69.6
23
1
10
6
6
1111
101
73.9
22
1
5
8
8
1100
111
63.6
22
1
7
7
7
1101
110
68.2
22
1
9
6
6
1110
101
72.7
22
1
11
5
5
1111
100
77.3
21
1
4
8
8
1011
111
61.9
21
1
6
7
7
1100
110
66.7
21
1
8
6
6
1101
101
71.4
21
1
10
5
5
1110
100
76.2
21
1
12
4
4
1111
011
81.0
20
1
3
8
8
1010
111
60.0
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