Preface
MPC5565 Microcontroller Reference Manual, Rev. 1.0
Freescale Semiconductor
21-31
describes the time segment syntax:
gives an overview of the CAN compliant segment settings and the related parameter values.
NOTE
Ensure the bit time settings are in compliance with the CAN standard.
21.4.5.5
Arbitration and Matching Timing
During normal transmission or reception of frames, the arbitration, match, move in and move out processes
are executed during certain time windows inside the CAN frame, as shown in
. When doing
matching and arbitration, FlexCAN2 needs to scan the whole message buffer memory during the available
time slot. To have sufficient time to do that, the following restrictions must be observed:
•
A valid CAN bit timing must be programmed, as indicated in
.
•
The system clock frequency cannot be smaller than the oscillator clock frequency, i.e. the PLL
cannot be programmed to divide down the oscillator clock.
•
There must be a minimum ratio of 16 between the system clock frequency and the CAN bit rate.
Table 21-17. Time Segment Syntax
Syntax
Description
SYNCSEG
System expects transitions to occur on the bus during this period.
Transmit point
A node in transmit mode transfers a new value to the CAN bus at this point.
Sample point
A node in receive mode samples the bus at this point. If the three samples per
bit option is selected, then this point marks the position of the third sample.
Table 21-18. CAN Standard Compliant Bit Time Segment Settings
Time Segment 1
Time Segment 2
Resynchronization
Jump Width
5 .. 10
2
1 .. 2
4 .. 11
3
1 .. 3
5 .. 12
4
1 .. 4
6 .. 13
5
1 .. 4
7 .. 14
6
1 .. 4
8 .. 15
7
1 .. 4
9 .. 16
8
1 .. 4
Summary of Contents for MPC5565
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Page 1153: ...Calibration MPC5565 Microcontroller Reference Manual Rev 1 0 B 8 Freescale Semiconductor...