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Chapter 18
AFCAN Controller
User’s Manual U16580EE3V1UD00
Figure 18-19:
Configuration of data bit time defined by CAN specification
Note:
IPT: Information Processing Time
Table 18-16:
Configuration of data bit time defined by CAN specification
Segment name
Settable range
Notes on setting to conform to CAN specification
Sync segment
(Synchronization segment)
1
This segment starts at the edge where the level
changes from recessive to dominant when
hardware synchronization is established.
Prop segment
Programmable to 1 to 8
or more
This segment absorbs the delay of the output
buffer, CAN bus, and input buffer.
The length of this segment is set so that ACK is
returned before the start of phase segment 1.
Time of prop segment
≥
(Delay of output buffer) +
2
×
(Delay of CAN bus) + (Delay of input buffer)
This segment compensates for an error of data bit
time.
The longer this segment, the wider the permissible
range but the slower the communication speed.
Phase segment 1
Programmable to 1 to 8
Phase segment 2
Phase segment 1 or IPT,
whichever greater
SJW
Programmable from 1TQ to
length of segment 1 or 4TQ,
whichever is smaller
This width sets the upper limit of expansion or
contraction of the phase segment during re-
synchronization.
Phase segment 1
Prop segment
Sync segment
Phase segment 2
Sample point (SPT)
SJW
Data bit time(DBT)
Содержание V850E/PH2
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