upd70f3422gj-gae-qs-ax Renesas Electronics Corporation., upd70f3422gj-gae-qs-ax Datasheet - Page 644
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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
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Chapter 19
644
R
D
Figure 19-3
Table 19-2
<1>
19.2.2 Frame types
19.2.3 Data frame and remote frame
Note
(1)
(1)
<2>
The following four types of frames are used in the CAN protocol.
Frame types
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,
Data frame
A data frame is composed of seven fields.
Data frame
D: Dominant = 0
R: Recessive = 1
Preliminary User’s Manual U17566EE1V2UM00
Frame Type
Data frame
Remote frame
Error frame
Overload frame
the bus value becomes dominant level.
<3>
Data frame
Description
Frame used to transmit data
Frame used to request a data frame
Frame used to report error detection
Frame used to delay the next data frame or remote frame
<4>
<5>
<6> <7>
ACK field
CRC field
Data field
Control field
Arbitration field
Start of frame (SOF)
End of frame (EOF)
CAN Controller (CAN)
Interframe space
<8>
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