upd70f3422gj-gae-qs-ax Renesas Electronics Corporation., upd70f3422gj-gae-qs-ax Datasheet - Page 643
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upd70f3422gj-gae-qs-ax
Manufacturer Part Number
upd70f3422gj-gae-qs-ax
Description
32-bit Single-chip Microcontroller
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.UPD70F3422GJ-GAE-QS-AX.pdf
(930 pages)
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CAN Controller (CAN)
Higher
Lower
Figure 19-2
Data link
layer
Physical layer
19.2.1 Frame format
19.2 CAN Protocol
Note
Note
(1)
(2)
·
·
Logical link control (LLC)
Medium access control (MAC)
CAN (Controller Area Network) is a high-speed multiplex communication
protocol for real-time communication 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.
Composition of layers
CAN Controller specification
Standard format frame
• The standard format frame uses 11-bit identifiers, which means that it can
Extended format frame
• The extended format frame uses 29-bit (11 bits + 18 bits) identifiers, which
• An extended format frame is set when “recessive level” (CMOS level of “1”)
Preliminary User’s Manual U17566EE1V2UM00
handle up to 2,048 messages.
increases the number of messages that can be handled to 2,048 × 2
messages.
is set for both the SRR and IDE bits in the arbitration field.
·
·
·
·
·
·
·
·
·
·
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
Chapter 19
18
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