h8s-2649 Renesas Electronics Corporation., h8s-2649 Datasheet - Page 493

• Manufacturer Part Number: h8s-2649
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

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
Note:
Example: With a system clock of 24 MHz, a BRP setting of B'000000, a TSEG1 setting of
Bit rate = 24/{2 × (0 + 1) × (3 + 5 + 4)} = 1 Mbps
Table 14.3 Setting Range for TSEG1 and TSEG2 in BCR
Note: The time quantum values for TSEG1 and TSEG2 are determined by TSEG value + 1.
TSEG1
(BCR11−BCR8)
= f
A BCR value is used for BRP, TSEG1, and TSEG2.
*
f
CLK
CLK
B'0101, and a TSEG2 setting of B'100:
Settable unless BRP = B'000000.
= φ (system clock)
/{2 × (BPR setting + 1) × (3 + TSEG1 + TSEG2)}
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
CLK
Yes*
Yes*
Yes*
Yes*
Yes*
Yes*
Yes*
Yes*
Yes*
Yes*
Yes*
Yes*
001
No
CLK
010
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
is the system clock frequency.
TSEG2 (BCR14−BCR12)
011
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Section 14 Controller Area Network (HCAN)
Rev. 2.00 Dec. 05, 2005 Page 455 of 724
Yes
Yes
Yes
100
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
101
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
110
REJ09B0200-0200
No
No
No
No
111
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No