663
CAN Controller (CAN)
Chapter 19
Preliminary User’s Manual U17566EE1V2UM00
Figure 19-19
Configuration of data bit time defined by CAN specification
Table 19-16
Configuration of data bit time defined by CAN specification
Note
1.
IPT: Information Processing Time
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
(Propagation segment)
Programmable to 1 to 8
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 in the data
bit time. The longer this segment, the wider the
permissible range but the slower the
communication speed.
Phase segment 1
(Phase buffer segment 1)
Programmable to 1 to 8
Phase segment 2
(Phase buffer segment 2)
Phase segment 1 or
IPT
Note
, whichever greater
SJW
(reSynchronization Jump
Width)
Programmable from 1 to
phase segment 1 to 4,
whichever is smaller
This width sets the upper limit of expansion or
contraction of the phase segment during
resynchronization.
Ph
as
e
s
egment 1
Prop
s
egment
S
ync
s
egment
Ph
as
e
s
egment 2
Sa
mple point (
S
PT)
S
JW
D
a
t
a
b
it time(DBT)
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