HD64F7047F50 Datasheet, PDF (506/766 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

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_CLK means the HCAN2 clock (φ/2).
TQ = (BRP setting + 1)/f_CLK
The following formula is used to calculate the 1-bit time and bit rate.
1-bit time = TQ × (1 + TSEG1 + TSEG2)
Bit rate = 1/Bit time
= f_CLK/{(TQ number set by BRP) × (1 + TQ number set by TSEG1 + TQ number
set by TSEG2)}
Note: f_CLK = φ/2 (system clock is divided by 2)
The TQ value of BCR is used for BRP, TSEG1, and TSEG2.
Example: With φ = 40 MHz, BRP = B'000001 (2TQ), TSEG1 = B'0100 (5TQ), and TSEG2 =
B'011 (4TQ):
Bit rate = 20/{(2) × (1 + 5 + 4)} = 1 Mbps
Table 15.5 Setting Range for TSEG1 and TSEG2 in BCR
TSEG2 (BCR[10:8])
001* 010 011 100 101 110 111
TQ
Value 2
3
4
5
6
7
8
TSEG1
0011
4
No
Yes
No
No
No
No
No
(BCR[15:12]) 0100
5
Yes Yes Yes
No
No
No
No
0101
6
Yes Yes Yes Yes
No
No
No
0110
7
Yes Yes Yes Yes Yes
No
No
0111
8
Yes Yes Yes Yes Yes Yes
No
1000
9
Yes Yes Yes Yes Yes Yes Yes
1001 10
Yes Yes Yes Yes Yes Yes Yes
1010 11
Yes Yes Yes Yes Yes Yes Yes
1011 12
Yes Yes Yes Yes Yes Yes Yes
1100 13
Yes Yes Yes Yes Yes Yes Yes
1101 14
Yes Yes Yes Yes Yes Yes Yes
1110 15
Yes Yes Yes Yes Yes Yes Yes
1111 16
Yes Yes Yes Yes Yes Yes Yes
Note: * When BRP[7:0] are B'00000000, TSEG[2:0] should not be set to B'001.
Rev. 2.00, 09/04, page 464 of 720