Can Protocol; Frame Format - NEC V850E/RS1 User Manual

16.2 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.
Higher
Lower
Note: CAN controller specification

16.2.1 Frame format

(1) Standard format frame
• The standard format frame uses 11-bit identifiers, which means that it can handle up to
(2) Extended format frame
• The extended format frame uses 29-bit (11 bits + 18 bits) identifiers, which increases the
• An extended format frame is set when "recessive level" (CMOS level of "1") is set for both the
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Figure 16-2: Composition of Layers
·
Logical link control (LLC)
Data link
layer Note
·
Medium access control (MAC)
Physical layer
2,048 messages.
number of messages that can be handled to 2,048
SRR and IDE bits in the arbitration field.
Chapter 16 FCAN Controller
·
Acceptance filtering
·
Overload report
·
Recovery management
·
Data capsuled/not capsuled
·
Frame coding (stuffing/no stuffing)
·
Medium access management
·
Error detection
·
Error report
·
Acknowledgement
·
Seriated/not seriated
Prescription of signal level and bit description
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218 messages.
User's Manual U16702EE3V2UD00