Table 15.3 Setting Range For Tseg1 And Tseg2 In Bcr - Renesas H8S Series Hardware Manual

Time Quanta (TQ) is an integer multiple of the number of system clocks, and is determined by the
baud rate prescaler (BRP) as follows. f
TQ = 2 × (BPR setting + 1)/f
The following formula is used to calculate the 1-bit time and bit rate.
1-bit time = TQ × (3 + TSEG1 + TSEG2)
Bit rate = 1/Bit time
= f
CLK
= φ (system clock)
Note: f
CLK
A BCR value is used for BRP, TSEG1, and TSEG2.
Example: With a system clock of 20 MHz, a BRP setting of B'000000, a TSEG1 setting of
B'0100, and a TSEG2 setting of B'011:
Bit rate = 20/{2 × (0 + 1) × (3 + 4 + 3)} = 1 Mbps

Table 15.3 Setting Range for TSEG1 and TSEG2 in BCR

TSEG1 0011
(BCR[11:8])
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Notes: The time quantum value for TSEG1 and TSEG2 is the TSEG value + 1.
* Only a value other than BRP[13:8] = B'000000 can be set.
is the system clock frequency.
CLK
CLK
/{2 × (BPR setting + 1) × (3 + TSEG1 + TSEG2)}
001 010
2 3
No Yes
Yes *
Yes
Yes *
Yes
Yes *
Yes
Yes *
Yes
Yes *
Yes
Yes *
Yes
Yes *
Yes
Yes *
Yes
Yes *
Yes
Yes *
Yes
Yes *
Yes
Yes *
Yes
Section 15 Controller Area Network (HCAN)
TSEG2 (BCR[14:12])
011 100 101
4 5
No No No
Yes No No
Yes Yes No
Yes Yes Yes
Yes Yes Yes
Yes Yes Yes
Yes Yes Yes
Yes Yes Yes
Yes Yes Yes
Yes Yes Yes
Yes Yes Yes
Yes Yes Yes
Yes Yes Yes
Rev. 6.00 Mar 15, 2006 page 419 of 570
110 111
6 7 8
No No
No No
No No
No No
Yes No
Yes Yes
Yes Yes
Yes Yes
Yes Yes
Yes Yes
Yes Yes
Yes Yes
Yes Yes
REJ09B0211-0600