Datasheet

V850ES/JG3-H, V850ES/JH3-H CHAPTER 20 CAN CONTROLLER
R01UH0042EJ0500 Rev.5.00 Page 917 of 1513
Aug 12, 2011
(b) Resynchronization
Synchronization is established again if a level change is detected on the bus during reception (only if a
recessive level was sampled previously).
• The phase error of the edge is given by the relative position of the detected edge and sync segment.
<Sign of phase error>
0: If the edge is within the sync segment
Positive: If the edge is before the sample point (phase error)
Negative: If the edge is after the sample point (phase error)
If phase error is positive: Phase segment 1 is longer by specified SJW.
If phase error is negative: Phase segment 2 is shorter by specified SJW.
• The sample point of the data of the receiving node moves relatively due to the “discrepancy” in the baud
rate between the transmitting node and receiving node.
Figure 20-21. Resynchronization
CAN bus
Bit timing
CAN bus
Bit timing
Phase segment 1
Prop
segment
Sync
segment
Phase
segment 2
Phase segment 1
Prop
segment
Sync
segment
Phase
segment 2
Sample point
Sample point
If phase error is negative
If phase error is positive