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Chapter 18
AFCAN Controller
User’s Manual U16580EE3V1UD00
18.2.2 Frame
types
The following four types of frames are used in the CAN protocol.
(1)
Bus value
The bus values are divided into dominant and recessive.
•
Dominant level is indicated by logical 0.
•
Recessive level is indicated by logical 1.
•
When a dominant level and a recessive level are transmitted simultaneously, the bus value
becomes dominant level.
18.2.3 Data frame and remote frame
(1)
Data frame
A data frame is composed of seven fields.
Figure 18-3:
Data Frame
Note:
D: Dominant = 0
R: Recessive = 1
Table 18-2:
Frame types
Frame Type
Description
Data frame
Frame used to transmit data
Remote frame
Frame used to request a data frame
Error frame
Frame used to report error detection
Overload frame
Frame used to delay the next data frame or remote frame
R
D
Interfr
a
me
s
p
a
ce
End of fr
a
me (EOF)
D
a
t
a
fr
a
me
<1>
<2>
<
3
>
<4>
<5>
<6> <7>
<
8
>
ACK field
CRC field
D
a
t
a
field
Control field
Ar
b
itr
a
tion field
S
t
a
rt of fr
a
me (
S
OF)
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