742
Chapter 18
AFCAN Controller
User’s Manual U16580EE3V1UD00
18.2 CAN
Protocol
CAN (Controller Area Network) is a high-speed multiplex communication protocol for real-time commu-
nication in automotive applications (class C). CAN is prescribed by ISO 11898. For details, refer to the
ISO 11898 specifications.
The CAN specification is generally divided into two layers: a physical layer and a data link layer. In turn,
the data link layer includes logical link and medium access control. The composition of these layers is
illustrated below.
Figure 18-2:
Composition of Layers
Note:
CAN Controller specification
18.2.1 Frame
format
(1)
Standard format frame
•
The standard format frame uses 11-bit identifiers, which means that it can handle up to 2,048
messages.
(2)
Extended format frame
•
The extended format frame uses 29-bit (11 bits + 18 bits) identifiers, which increases the
number of messages that can be handled to 2,048
×
2
18
messages.
•
An extended format frame is set when “recessive level” (CMOS level of “1”) is set for both the
SRR and IDE bits in the arbitration field.
Phy
s
ic
a
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a
yer
Pre
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cription of
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ign
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l level
a
nd
b
it de
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cription
D
a
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a
link
l
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yer
Note
·
Logic
a
l link control (LLC)
·
Medi
u
m
a
cce
ss
control (MAC)
·
Accept
a
nce filtering
·
Overlo
a
d report
·
Recovery m
a
n
a
gement
·
D
a
t
a
c
a
p
su
led/not c
a
p
su
led
·
Fr
a
me coding (
s
t
u
ffing/no
s
t
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ffing)
·
Medi
u
m
a
cce
ss
m
a
n
a
gement
·
Error detection
·
Error report
·
Acknowledgement
·
S
eri
a
ted/not
s
eri
a
ted
Higher
Lower
Содержание V850E/PH2
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Страница 984: ...984 Chapter 23 On Chip Debug Function OCD User s Manual U16580EE3V1UD00 MEMO...
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