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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)
Summary of Contents for MuPD70F3187
Page 6: ...6 Preface User s Manual U16580EE3V1UD00 ...
Page 16: ...16 User s Manual U16580EE3V1UD00 ...
Page 28: ...28 User s Manual U16580EE3V1UD00 ...
Page 32: ...32 User s Manual U16580EE3V1UD00 ...
Page 84: ...84 Chapter 2 Pin Functions User s Manual U16580EE3V1UD00 MEMO ...
Page 144: ...144 Chapter 3 CPU Functions User s Manual U16580EE3V1UD00 MEMO ...
Page 312: ...312 Chapter 9 16 Bit Timer Event Counter P User s Manual U16580EE3V1UD00 MEMO ...
Page 534: ...534 Chapter 11 16 bit Timer Event Counter T User s Manual U16580EE3V1UD00 ...
Page 969: ...969 Chapter 20 Port Functions User s Manual U16580EE3V1UD00 MEMO ...
Page 970: ...970 Chapter 20 Port Functions User s Manual U16580EE3V1UD00 ...
Page 976: ...976 Chapter 22 Internal RAM Parity Check Function User s Manual U16580EE3V1UD00 MEMO ...
Page 984: ...984 Chapter 23 On Chip Debug Function OCD User s Manual U16580EE3V1UD00 MEMO ...
Page 1006: ...1006 Chapter 24 Flash Memory User s Manual U16580EE3V1UD00 MEMO ...
Page 1036: ...1036 Chapter 27 Recommended Soldering Conditions User s Manual U16580EE3V1UD00 MEMO ...
Page 1046: ...1046 Appendix A Index User s Manual U16580EE3V1UD00 MEMO ...
Page 1052: ...1052 User s Manual U16580EE3V1UD00 ...
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