Bit Configuration Register (Bcr) - Renesas H8SX/1500 Series Hardware Manual

Section 13 Controller Area Network (HCAN)
13.3.3

Bit Configuration Register (BCR)

BCR sets HCAN bit timing parameters and the baud rate. For details on parameters, refer to
section 13.4.2, Initialization after Hardware Reset.
Bit 15
Bit Name BCR7
Initial Value 0
R/W R/W
Bit 7
Bit Name BCR15
Initial Value 0
R/W R/W
Bit Bit Name
15 BCR7
14 BCR6
13 BCR5
12 BCR4
11 BCR3
10 BCR2
9 BCR1
8 BCR0
7 BCR15
Rev. 3.00 Mar. 14, 2006 Page 456 of 804
REJ09B0104-0300
14 13
BCR6 BCR5
0 0
R/W R/W
6 5
BCR14 BCR13 BCR12
0 0
R/W R/W
Initial
Value R/W
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
12 11
BCR4 BCR3 BCR2
0 0
R/W R/W R/W
4 3
BCR11 BCR10
0 0
R/W R/W R/W
Description
Re-Synchronization Jump Width (SJW)
Set the maximum bit synchronization width.
00: 1 time quantum
01: 2 time quanta
10: 3 time quanta
11: 4 time quanta
Baud Rate Prescaler (BRP)
Set the length of time quanta.
000000: 2 × system clock
000001: 4 × system clock
000010: 6 × system clock
:
111111: 128 × system clock
Bit Sample Point (BSP)
Sets the point at which data is sampled.
0: Bit sampling at one point (end of time segment
1 (TSEG1))
1: Bit sampling at three points (end of TSEG1 and
preceding and following time quanta)
10 9 8
BCR1 BCR0
0 0 0
R/W
R/W
2 1 0
BCR9 BCR8
0 0 0
R/W R/W