Figure 14-40: Can 1 To 4 Bit Rate Prescaler Registers (C1Brp To C4Brp) (1/2) - NEC V850E/CA2 JUPITER Preliminary User's Manual

(8) CAN 1 to 4 bit rate prescaler registers (C1BRP to C4BRP)
The CxBRP registers specify the bit rate prescaler and CAN bus speed of the corresponding CAN
module x (x = 1 to 4 for the derivatives µPD703129(A) and µPD703129(A1), x = 1 to 2 for the
derivative µPD703128(A)).
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 permit-
ted in initialisation mode (ISTAT bit of the CxCTRL register = 1)

Figure 14-40: CAN 1 to 4 Bit Rate Prescaler Registers (C1BRP to C4BRP) (1/2)

TLM = 0 15 14 13
C1BRP TLM 0 0
C2BRP TLM 0 0
C3BRP TLM 0 0
C4BRP TLM 0 0
TLM = 1 15 14 13
C1BRP TLM 0 0
C2BRP TLM 0 0
C3BRP TLM 0 0
C4BRP TLM 0 0
Bit Position Bit Name
15 TLM
8
(TLM = 1)
BTYPE
6
(TLM = 0)
Note: The register address is calculated according to the following formula:
effective address = PP_BASE + 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.
Chapter 14 FCAN Interface Function
12 11 10 9 8
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
12 11 10 9 8
0 0 0 0 BTYPE BRP7 BRP6 BRP5 BRP4 BRP3 BRP2 BRP1 BRP0
0 0 0 0 BTYPE BRP7 BRP6 BRP5 BRP4 BRP3 BRP2 BRP1 BRP0
0 0 0 0 BTYPE BRP7 BRP6 BRP5 BRP4 BRP3 BRP2 BRP1 BRP0
0 0 0 0 BTYPE BRP7 BRP6 BRP5 BRP4 BRP3 BRP2 BRP1 BRP0
Specifies the transfer layer mode.
0: Transfer layer uses 6-bit prescaler setting.
1: Transfer layer uses 8-bit prescaler setting.
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)
Preliminary User's Manual U15839EE1V0UM00
7 6 5 4 3
0 BTYPE BRP5 BRP4 BRP3 BRP2 BRP1 BRP0
0 BTYPE BRP5 BRP4 BRP3 BRP2 BRP1 BRP0
0 BTYPE BRP5 BRP4 BRP3 BRP2 BRP1 BRP0
0 BTYPE BRP5 BRP4 BRP3 BRP2 BRP1 BRP0
7 6 5 4 3
Function
Address
2 1 0
Note
Offset
105CH
109CH
10DCH
111CH
Address
2 1 0
Note
Offset
105CH
109CH
10DCH
111CH
Initial
value
0000H
0000H
0000H
0000H
Initial
value
503