504
Chapter 14
FCAN Interface Function
Preliminary User’s Manual U15839EE1V0UM00
Figure 14-40:
CAN 1 to 4 Bit Rate Prescaler Registers (C1BRP to C4BRP) (2/2)
Remark:
The BRP defines the period of the base clock f
BTL
for the protocol layer of a CAN module. It
determines the number of FCAN system clocks f
MEM
per time quantum TQ. A time quantum
TQ is the basic unit of a bit in a CAN frame:
Bit Position
Bit Name
Function
7 to 0
(TLM = 1)
5 to 0
(TLM = 0)
BRP7 to
BRP0
(TLM = 1)
BRP5 to
BRP0
(TLM = 0)
Specifies the bit rate prescaler for the CAN protocol layer.
TLM = 0:
BRP5
BRP4
BRP3
BRP2
BRP1
BRP0
Bit Rate Prescaler
f
BTL
= f
MEM
/ 2
×
(k+1)
k
0
0
0
0
0
0
f
BTL
= f
MEM
/ 2
0
0
0
0
0
0
1
f
BTL
= f
MEM
/ 4
1
0
0
0
0
1
0
f
BTL
= f
MEM
/ 6
2
0
0
0
0
1
1
f
BTL
= f
MEM
/ 8
3
0
0
0
1
0
0
f
BTL
= f
MEM
/ 10
4
·
·
·
·
·
·
·
·
·
1
1
1
1
1
0
f
BTL
= f
MEM
/ 126
62
1
1
1
1
1
1
f
BTL
= f
MEM
/ 128
63
TLM = 1:
BRP7
BRP6 BRP5 BRP4 BRP3 BRP2 BRP1 BRP0
Bit Rate Prescaler
f
BTL
= f
MEM
/ (k+1)
k
0
0
0
0
0
0
0
0
f
BTL
= f
MEM
0
0
0
1
0
0
0
0
1
f
BTL
= f
MEM
/ 2
1
0
0
0
0
0
0
1
0
f
BTL
= f
MEM
/ 3
2
0
0
0
0
0
0
1
1
f
BTL
= f
MEM
/ 4
3
0
0
0
0
0
1
0
0
f
BTL
= f
MEM
/ 5
4
·
·
·
·
·
·
·
·
·
1
1
1
1
1
1
1
0
f
BTL
= f
MEM
/ 255
254
1
1
1
1
1
1
1
1
f
BTL
= f
MEM
/ 256
255
TQ
1
f
BTL
----------
=
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