upd70f3402 Renesas Electronics Corporation., upd70f3402 Datasheet - Page 528

• Manufacturer Part Number: upd70f3402
• Description: 32-/16-bit Single-chip Microcontroller With Can Interface
• Manufacturer: Renesas Electronics Corporation.

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.
Note: CAN controller specification
16.2.1 Frame format
(1)
(2)
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Standard format frame
• The standard format frame uses 11-bit identifiers, which means that it can handle up to
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
Higher
Lower
2,048 messages.
number of messages that can be handled to 2,048
SRR and IDE bits in the arbitration field.
Data link
layer
Physical layer
Note
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Logical link control (LLC)
Medium access control (MAC)
Figure 16-2: Composition of Layers
Chapter 16 FCAN Controller
User’s Manual U16702EE3V2UD00
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Prescription of signal level and bit description
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
218 messages.