HD64F2638F20J Datasheet, PDF (705/1512 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series

H8S/2639, H8S/2638, H8S/2636,
H8S/2630, H8S/2635 Group
Table 16-3 BCR Register Value Setting Ranges
Name
Time segment 1
Time segment 2
Baud rate prescaler
Sample point
Synchronization jump width
Abbreviation
TSEG1
TSEG2
BRP
SAM
SJW
Section 16 Controller Area Network (HCAN)
Min. Value
B'0011
B'001
B'000000
B'0
B'00
Max. Value
B'1111
B'111
B'111111
B'1
B'11
b. Value Setting Ranges
• The minimum value of SJW is stipulated in the CAN specifications.
3 ≥ SJW ≥ 0
• The minimum value of TSEG1 is stipulated in the CAN specifications.
TSEG1 > TSEG2
• The minimum value of TSEG2 is stipulated in the CAN specifications.
TSEG2 ≥ SJW
The following formula is used to calculate the baud rate.
Bit rate =
f_CLK
[b/s] ^{2 × (BRP + 1) × (3 + TSEG1 + TSEG2)}
Note: fCLK = φ (system clock)
The BCR value are used for BRP, TSEG1, and TSEG2.
Example: With a 1 Mb/s baud rate and a 20 MHz input clock:
1 Mb/s =
20 MHz
2 × (0 + 1) × (3 + 4 + 3)
REJ09B0103-0800 Rev. 8.00
May 28, 2010
Page 655 of 1458