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440
Chapter 13
FCAN Interface Function
Preliminary User’s Manual U14913EE1V0UM00
(8)
CAN 1 to 3 bit rate prescaler registers (C1BRP to C3BRP)
The CxBRP registers specify the bit rate prescaler and CAN bus speed of the corresponding CAN
module x
(x = 1 to 3). The register layout depends on the TLM bit (bit 15), and distinguishes
between 6-bit prescaler (TLM bit = 0) and 8-bit prescaler (TLM bit = 1).
These registers can be read/written in 8-bit and 16-bit units. However, write access is only permitted
in initialisation mode (ISTAT bit of the CxCTRL register = 1)
Figure 13-40: CAN 1 to 3 Bit Rate Prescaler Registers (C1BRP to C3BRP) (1/2)
Note: The register address is calculated according to the following formula:
effective address = P address offset
Remarks: 1. Writing to this register is only possible if CAN module is set into initialisation mode.
2. CPU can read CxBRP register at any time.
Caution: In diagnostic mode the CxBRP register is hidden, and the CxDINF register appears
instead of it at the same address.
TLM = 0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Address
Offset
Note
Initial
value
C1BRP TLM
0
0
0
0
0
0
0
0
BTYPE BRP5 BRP4 BRP3 BRP2 BRP1 BRP0
85CH
0000H
C2BRP TLM
0
0
0
0
0
0
0
0
BTYPE BRP5 BRP4 BRP3 BRP2 BRP1 BRP0
89CH
0000H
C3BRP TLM
0
0
0
0
0
0
0
0
BTYPE BRP5 BRP4 BRP3 BRP2 BRP1 BRP0
8DCH
0000H
TLM = 1
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Address
Offset
Note
Initial
value
C1BRP TLM
0
0
0
0
0
0
BTYPE BRP7 BRP6 BRP5 BRP4 BRP3 BRP2 BRP1 BRP0
85CH
C2BRP TLM
0
0
0
0
0
0
BTYPE BRP7 BRP6 BRP5 BRP4 BRP3 BRP2 BRP1 BRP0
89CH
C3BRP TLM
0
0
0
0
0
0
BTYPE BRP7 BRP6 BRP5 BRP4 BRP3 BRP2 BRP1 BRP0
8DCH
Bit Position
Bit Name
Function
15
TLM
Specifies the transfer layer mode.
0: Transfer layer uses 6-bit prescaler setting.
1: Transfer layer uses 8-bit prescaler setting.
8
(TLM = 1)
6
(TLM = 0)
BTYPE
Specifies the CAN bus type.
0: CAN bus type is low speed bus (
≤
125 kbps)
1: CAN bus type is high speed bus (> 125 kbps)
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