HD6432621 Hitachi, HD6432621 Datasheet - Page 15

• Manufacturer Part Number: HD6432621
• Description: (HD64F262x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

Section
15.3.2 Initialization
after Hardware Reset
Bit Rate and Bit Timing
Settings
Page
559,
560
Description
Table 15-4 Setting Range for TSEG1 and TSEG2 in BCR
Notes: The time quanta value for TSEG1 and TSEG2 is the TSEG value + 1.
(BCR [11:8])
HCAN bit rate calculation:
BCR Setting Constraints
These constraints allow the setting range shown in table 15-3 for TSEG1 and TSEG2 in BCR.
1-bit time
Legend
SYNC_SEG: Segment for establishing synchronization of nodes on the CAN bus. (Normal
PRSEG:
PHSEG1:
PHSEG2:
Note: * The Time Quanta value for TSEG1 and TSEG2 is the TSEG value + 1.
TSEG1
*
Bit rate =
Note: f
TSEG1 > TSEG2
TSEG2 > B'001 (BRP = B'000000)
TSEG2 > B'000 (BRP > B'000000)
Setting is enabled except when BRP [13:8] = B'000000.
SYNC_SEG
1
The BCR values are used for BRP, TSEG1, and TSEG2.
bit edge transitions occur in this segment.)
Segment for compensating for physical delay between networks.
Buffer segment for correcting phase drift (positive). (This segment is extended
when synchronization (resynchronization) is established.)
Buffer segment for correcting phase drift (negative). (This segment is
shortened when synchronization (resynchronization) is established.)
CLK
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
2
= ø (system clock)
(BRP + 1)
Figure 15-6 Detailed Description of One Bit
Yes*
Yes*
Yes*
Yes*
Yes*
Yes*
Yes*
Yes*
Yes*
Yes*
Yes*
Yes*
SJW
001
No
1-bit time (8–25 time quanta)
PRSEG
TSEG1 (time segment 1)*
(3 + TSEG1 + TSEG2)
(SJW = 0 to 3)
f
CLK
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
010
2–16
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
011
No
TSEG2 (BCR [14:12])
PHSEG1
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
100
No
No
TSEG2 (time segment 2)*
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
101
No
No
No
PHSEG2
2–8
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
110
No
No
No
No
Quantum
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
111
No
No
No
No
No