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Chapter 19
CAN Controller (CAN)
Preliminary User’s Manual U17566EE1V2UM00
<8> Interframe space
The interframe space is inserted after a data frame, remote frame, error frame,
or overload frame to separate one frame from the next.
• The bus state differs depending on the error status.
– Error active node
The interframe space consists of a 3-bit intermission field and a bus idle
field.
Figure 19-13
Interframe space (error active node)
Note
1.
Bus idle: State in which the bus is not used by any node.
2.
D: Dominant = 0
R: Recessive = 1
– Error passive node
The interframe space consists of an intermission field, a suspend
transmission field, and a bus idle field.
Figure 19-14
Interframe space (error passive node)
Note
1.
Bus idle:
State in which the bus is not used by any node.
Suspend transmission:
Sequence of 8 recessive-level bits transmitted
from the node in the error passive status.
2.
D: Dominant = 0
R: Recessive = 1
Usually, the intermission field is 3 bits. If the transmitting node detects a
dominant level at the third bit of the intermission field, however, it
executes transmission.
R
D
Interfr
a
me
s
p
a
ce
Intermi
ss
ion
(
3
b
it
s
)
B
us
idle
(0 to
∞
b
it
s
)
(Fr
a
me)
(Fr
a
me)
R
D
Interfr
a
me
s
p
a
ce
Intermi
ss
ion
(
3
b
it
s
)
Sus
pend tr
a
n
s
mi
ss
ion
(
8
b
it
s
)
B
us
idle
(0 to
∞
b
it
s
)
(Fr
a
me)
(Fr
a
me)
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