653
CAN Controller (CAN)
Chapter 19
Preliminary User’s Manual U17566EE1V2UM00
19.2.5
Overload frame
An overload frame is transmitted under the following conditions.
• When the receiving node has not completed the reception operation
• If a dominant level is detected at the first two bits during intermission
• If a dominant level is detected at the last bit (7th bit) of the end of frame or at
the last bit (8th bit) of the error delimiter/overload delimiter
Figure 19-16
Overload frame
Note
1.
D: Dominant = 0
R: Recessive = 1
2.
Node n
≠
node m
Table 19-8
Definition of overload frame fields
<1>
R
D
<2>
<
3
>
6
b
it
s
0 to 6
b
it
s
8
b
it
s
(<4>)
(<5>)
Interfr
a
me
s
p
a
ce or overlo
a
d fr
a
me
Overlo
a
d delimiter
Overlo
a
d fl
a
g (node n)
Overlo
a
d fl
a
g (node m)
Fr
a
me
Overlo
a
d fr
a
me
No
Name
Bit
count
Definition
<1>
Overload flag
6
Outputs 6 dominant-level bits consecutively.
<2>
Overload flag from other
node
0 to 6
The node that received an overload flag in the interframe
space outputs an overload flag.
<3>
Overload delimiter
8
Outputs 8 recessive-level bits consecutively.
If a dominant level is detected at the 8th bit, an overload
frame is transmitted from the next bit.
<4>
Frame
–
Output following an end of frame, error delimiter, or
overload delimiter.
<5>
Interframe space/overload
frame
–
An interframe space or overload frame starts from here.
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