Section 13 Controller Area Network (HCAN)
Rev. 3.00 Mar. 14, 2006 Page 487 of 804
REJ09B0104-0300
(2)
Bit Rate and Bit Timing Settings
The bit rate and bit timing settings are made in the bit configuration register (BCR). Settings
should be made such that all CAN controllers connected to the CAN bus have the same baud rate
and bit width. The 1-bit time consists of the total of the settable time quanta (tq).
SYNC_SEG
PRSEG
PHSEG1
PHSEG2
Time segment 2
(TSEG2)
Time segment 1 (TSEG1)
1-bit time (8–25 time quanta)
4 to 16 time quanta
2 to 8 time quanta
1 time quanta
Figure 13.8 Detailed Description of One Bit
SYNC_SEG is a segment for establishing the synchronization of nodes on the CAN bus. Normal
bit edge transitions occur in this segment. PRSEG is a segment for compensating for the physical
delay between networks. PHSEG1 is a buffer segment for correcting phase drift (positive). This
segment is extended when synchronization (resynchronization) is established. PHSEG2 is a buffer
segment for correcting phase drift (negative). This segment is shortened when synchronization
(resynchronization) is established. Limits on the settable value (TSEG1, TSEG2, BRP, BSP, and
SJW) are shown in table 13.2.
Table 13.2 Limits for the Settable Value
Name
Abbreviation
Min. Value
Max. Value
Time segment 1
TSEG1
B'0011
*
2
B'1111
Time segment 2
TSEG2
B'001
*
3
B'111
Baud rate prescaler
BRP
B'000000
B'111111
Bit sample point
BSP
B'0
B'1
Re-synchronization jump width
SJW
*
1
B'00 B'11
Notes: 1. SJW is stipulated in the CAN specifications:
3
≥
SJW
≥
0
2. The minimum value of TSEG2 is stipulated in the CAN specifications:
TSEG2
≥
SJW
3. The minimum value of TSEG1 is stipulated in the CAN specifications:
TSEG1 > TSEG2
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