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Chapter 25 FlexCAN
MPC5606BK Microcontroller Reference Manual, Rev. 2
562
Freescale Semiconductor
Offset: 0x0004
Access: Read/write
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
PRESDIV
RJW
PSEG1
PSEG2
W
RESET:
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
BOFF_MSK
ERR_
MSK
CLK_SRC
LPB
TWR
N
_MSK
R
W
RN_MSK
0
0
SMP
BOFF_RE
C
TSYN
LBUF LOM
PROPSEG
W
RESET:
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Figure 25-6. Control (CTRL) register
Table 25-10. CTRL field descriptions
Field
Description
PRESDIV
Prescaler Division Factor
This 8-bit field defines the ratio between the CPI clock frequency and the Serial Clock (Sclock)
frequency. The Sclock period defines the time quantum of the CAN protocol. For the reset value, the
Sclock frequency is equal to the CPI clock frequency. The Maximum value of this register is 0xFF, that
gives a minimum Sclock frequency equal to the CPI clock frequency divided by 256. For more
information refer to
Section 25.5.9.4, Protocol timing.
This bit must be written in Freeze mode only.
Sclock frequency = CPI clock frequency / (P 1)
RJW
Resync Jump Width
This 2-bit field defines the maximum number of time quanta
1
that a bit time can be changed by one
resynchronization. The valid programmable values are 0–3. This bit must be written in Freeze mode
only.
Resync Jump Width = RJW + 1.
PSEG1
Phase Segment 1
This 3-bit field defines the length of Phase Buffer Segment 1 in the bit time. The valid programmable
values are 0–7. This bit must be written in Freeze mode only.
Phase Buffer Segment 1 = (PSEG1 + 1) × Time Quanta.
PSEG2
Phase Segment 2
This 3-bit field defines the length of Phase Buffer Segment 2 in the bit time. The valid programmable
values are 1–7. This bit must be written in Freeze mode only.
Phase Buffer Segment 2 = (PSEG2 + 1) × Time Quanta.
BOFF_MSK Bus Off Mask
This bit provides a mask for the Bus Off Interrupt.
0 Bus Off interrupt disabled
1 Bus Off interrupt enabled
ERR_MSK
Error Mask
This bit provides a mask for the Error Interrupt.
0 Error interrupt disabled
1 Error interrupt enabled
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